SECTION - 8001

GENERAL SPECIFICATIONS FOR ELECTRICAL WORKS

1. SCOPE OF WORK

The works related to the Electrical system, which are included in the scope of this
Contract, are shown on the Drawings, stated in the Specifications and Bill of Quantities
and explained in these specifications. The works shall broadly include but not limited to
the following:

- LT Switchboard / LT Outdoor Distribution Board

- Light Fixtures
- Low Tension Cable
- Wiring Accessories
- Pipes and Conduits
- Earthing / Grounding System
- Miscellaneous items
- Coordination with the utility KELECTRIC and ensuring approval for required
0.415KV connection and termination of 0.415kV cables at Main Low Tension
Outdoor Distributors.

The Contractor shall also be responsible to supply any other equipment not specifically
mentioned in these documents but which is necessary for proper operation of the system
as intended in the scope of this Contract. The Contractor shall solely be responsible for
ensuring proper functional requirements of various equipment and shall be responsible
for furnishing any additional piece of equipment and for making modifications in the
equipment as desired and/or approved by the Engineer to achieve proper co-ordination
with various equipment offered in the bid and also with those installed by others.

Contractor shall timely carry out field survey to identify the route and exact location of
feeders which are to be connected with the proposed Main Low tension Outdoor
Distributors (MLTODs). However, the contractor is fully responsible to ensure timely
coordination and approval from with the utility (KELECTRIC) related to connection and
termination of 0.415kV suppy and cables at Main Low Tension Outdoor
Distributors(MLTODs).

The Contractor shall have good knowledge pertaining to such works and shall ensure its
implementation along with any additional requirements as spelled out in the tender
documents or as per the requirement of these authorities.

2. RULES & REGULATIONS

The entire electrical installation/work shall be carried out by licensed Contractor,

authorized to undertake such work under the provisions of the Electricity Act 1910 and
The Electricity Rules 1937 as adopted and modified upto date by the Government of
Pakistan.

All works shall be carried out in accordance withthe latest edition of the Regulations of
the Electrical Equipment of Buildings issued by the Institute of Electrical Engineers-
London, the Tender Documents, The Electricity Rules 1937 and bye-laws that are in
force from time to time. Any discrepancy between these Specifications and any other
rules and regulations shall be brought to the notice of Engineer for his instructions and
the decision of the Engineer shall be final and conclusive.

Construction of Bridge at Korangi Causeway 8001-1 General Specifications for Electrical Works
 The Contractor shall ensure that the connection of 0.415kV supply and cable with
theMain Low Tension Outdoor Distributors (MLTODs) is certified by / acceptable
toKELECTRIC.

3. AMBIENT CONDITIONS

All material and equipment supplied and installed shall be designed, manufactured and
tested to meet the following ambient conditions unless specifically stated otherwise for
any material/equipment.

Maximum indoor ambient temperature : 50 Degree Celsius

Minimum indoor ambient temperature : Zero Degree Celsius
Maximum outdoor ambient temperature : 50 Degree Celsius
Minimum outdoor ambient temperature : Zero Degree Celsius
Maximum Relative humidity : 90 Percent
Maximum Altitude of project : 5.467 meters
Design basic wind speed : 100 miles/hr
Fastest mile wind velocity as
Per UBC 1997
Seismic Zone : 2B as per UBC 1997

The atmospheric condition is highly humid. The wind loading shall also be considered as
per applicable local Codes and Standards.

All the offered/supplied electrical equipment, devices and material etc., shall be strictly in
line with the project site conditions.

4. STANDARDS

The latest standards, codes and recommendations of reputable institutions shall be

applicable for the material and equipment specified herein and for installation work. Such
institutions to be BSS, VDE, IEC, NEC, NFPAetc. In case the Specifications laid down
herein differ from those given in the standards, then the equivalent or better
specifications shall govern. Wherever applicable the equipment shall also conform to the
requirements of Pakistan Standards and Quality Control Authority (PSQCA) and
Pakistan Standard Institution (PSI).

Contractor shall maintain at the site office one copy of the standards/codes/
recommendations as applicable to the works and will furnish the same as and when
required by the Engineer / Employer.

5. SYSTEM DATA

Unless otherwise specified elsewhere, all equipment and material shall be designed to
operate satisfactorily with the following minimum requirements without any de-rating.

a) Voltage rating of equipment : LT: 400V, 3 phase +10%

230 V, 1 phase + 10%

b) Frequency : 50 Hz + 2 Hz

In general, the electrical colour coding of switchgear cubicles, control panels, desks etc.,
shall be in accordance with the respective IEC Recommendations.

Live parts of electrical connections shall be colour coded according to IEC 60445:2017 &
BS7671:2008 as follows:

Construction of Bridge at Korangi Causeway 8001-2 General Specifications for Electrical Works
 Conductor Coding Colour
Designation Alphanumeric

A.C. Network Phase 1 L1 red

Phase 2 L2 yellow
Phase 3 L3 blue
Neutral N black

D.C. Network Positive L+ white

Negative L- black

Earthing Protective Earth PE green/yellow

Earth E green/yellow

Control Cables

The Control Cables shall be manufactured according to specifications for L.T. Cables.
The Control Cables shall be of multi-core, PVC insulated type withstanding without
deterioration the conditions prevailing at the place of installation. The cross section of
cable shall be as per the requirement of the system.

All the cores should be numbered and/or colour coded or otherwise properly identified.
At-least 20% spare cores shall be provided in all Control Cables.

No separate payment is admissible for supplying, installing, testing and commissioning

of control cables and is deemed to have been included in the BOQ rates of the
respective equipment.
Distance in between power, communication and control cables shall be kept as per
requirements laid down by NEC800, NFPA 70 and BS EN 50174-2:2009+A2:2014.

6. EQUIPMENT

6.1. Equipment Manufacturer

All equipment and material supplied for the project shall be standard products of
reputable and ISO certified manufacturers having similar manufacturing
experience of at-least five years.

For imported equipment, required for the project, only authorized local
distributors/suppliers of the Original Equipment Manufacturer (OEM) shall be
considered.

For all Original Equipment Manufacturer (OEM) equipment, the Contractor shall
clearly identify the brand of the equipment, the country where the equipment has
been manufactured, as well as the local agent in Pakistan who is able to provide
local maintenance assistance.

Authorized Local agents reference shall include at least (but not limited to)

• Company name,
• Address in Pakistan,
• Contact persons,
• Phone numbers,
• Valid Email,
• Reference of the company in similar fields.
• Authorized Distribution Certificate from OEM.
• Certified Engineer's Certificate.

Construction of Bridge at Korangi Causeway 8001-3 General Specifications for Electrical Works
 After sales, service, spare and support of all offered local/imported equipment
and material shall be available with the manufacturer/authorized distributors.

OEM/Distributors failing the above-mentioned requirements are liable not to be

considered.

6.2. Country of Origin

Equipment manufactured in Israel and Indiaare not acceptable. The Contractor

shall clearly mention in his bid the origin of the equipment that he is proposing.
In case any subassembly or part assembly is from any country other than that
the country where the equipment has been manufactured, the Contractor shall
disclose this information with his bid. No relaxation/acceptance of equipment
from the non-listed countries will be entertained after award of Contract.

6.3. Quality Assurance

All materials and equipment shall be new, unused and of best quality. Standard
components of suppliers regularly engaged in their manufacture shall be offered.
All equipment and components shall have been thoroughly tested and proven in
actual use. Equipment shall have current year of manufacturing.

Manufacturers quality control shall be in accordance with the ISO 9000 - series
(or DIN equivalent) recommendations. Manufacturers whose quality control has
been certified according to ISO 9000 – series will only be acceptable. Certified
copy shall be attached to bid.

6.4. IP Degree of Protection

The equipment shall have IP degree of protection as follows, unless mentioned

otherwise:

- IP 42 for indoor areas

- IP 54 for indoor damp areas
- IP 65 for outdoor areas

After installation, the contractor shall be responsible to provide high performance

epoxy paint on all Switchboards and related electrical equipment. If properly
rated equipment is not available, the Contractor shall provide field enclosures to
attain the required IP degree of protection. If necessary cooling/exhaust fans and
/ or anti condensate heaters shall also be provided. No separate payment shall
be made to attain the required IP degree of protection and itdeemed to have
been included in the relevant BoQ item.

6.5. Protective Paint Coating for Electrical and EquipmentComponents

All outdoor metal works including but not limited to transformer, cable
trays,outdoor LTDistribution Boards, lighting poles etc., shall be coated with
protective paint system in accordance with ISO 12944 Corrosivity Category “C5”
with Medium Durability. The Priming coat(s) shall be Epoxy based and top coat
shall be polyurethane based with color shade, not other than RAL 7032 / 7035 or
as approved by the Engineer.

Appropriate bonding / adhesion material such as Etch Primer is recommended

for use with Galvanized Surfaces before application of above-mentioned
protective paint system.

The Contractor shall submit following documents pertaining to protective paint

system for approval of the Engineer.

Construction of Bridge at Korangi Causeway 8001-4 General Specifications for Electrical Works
 - Paint manufacturer’s confirmation that proposed paint system is compatible
with the intended surface to be coated.
- Paint manufacturer’s confirmation that proposed paint products are
compatible with each other.
- Paint products catalogues.
- OEM’s recommended surface preparation methodology.
- No. of coats.
- DFT per coat.
6.6. Nameplate

All equipment shall be provided with stainless steel name plates which shall be
mounted in a visible position. The entries on the name plate shall be indelibly
marked in English by engraving and shall include the data in accordance with
relevant IEC and other relevant standard applicable to each equipment. In
addition, any specified requirement stated in these specifications shall also be
complied.
The Contractor shall also supply all labels, instruction and warning plates
necessary for the identification and safe operation of the plant/site and all
instructions shall be in English and where specified in Urdu languages. All
labels, nameplates, instructions and warning plates shall be securely fixed to
items of plant and equipment with stainless steel rivets, plated self-tapping
screws or by other approved means. The use of adhesives will not be permitted.

6.7. Identification & Labeling

All devices, meters cabling, wiring and auxiliaries shall be properly labeled for
identification. Labeling of equipment shall be done by means of flameproof
material using indelible ink/marking. The labeling shall be such as to ensure
uniformity and shall facilitate study of control diagrams/ drawings during
operation and maintenance.

All labeling shall be of suitable size to be visible from the operating

conditions/positions at site.

6.8. Lamp Test Facility

All equipment / Switchboards / Motor Control Centers, etc. shall be provided with
common lamp test facility.

7. SHOP DRAWINGS,MATERIAL SUBMITTALS, AND TECHNICAL DATA TO BE

FURNISHED BY THE CONTRACTOR

7.1. The shop drawings, comprehensive material submittals and/or technical data to
be furnished by the Contractor for each electrical equipment shall include, but
not limited to the following:

a) Structural drawings showing foundations, RCC details dimensional plans,

elevation and sections on a suitable scale including loading details of the
equipment.

b) Electrical drawings showing:

- Line/Schematic diagrams of:

 LT Outdoor Distributors

Construction of Bridge at Korangi Causeway 8001-5 General Specifications for Electrical Works
  Detailed wiring / control diagrams, elevations / internal component
layout / Top & Bottom / Side views and other standard / required
details.

c) Complete shop drawings of all systems with necessary execution / fixing/

installation details such as no. of wires, size of conduit, cable routes, cable
schedules etc.for the following layouts unless required otherwise:
- Lighting Layouts
- Grounding Layouts
- LV Cabling details including complete cable routing / conduiting / piping
and other required details
- Manhole / Duct woks
- Danger Sign Board Dimensional and installation Details.

- Combined and Coordinated Layouts.

d) Equipment installation details for LT Outdoor Distribution Board(s)

e) Technical literature and manufacturer's characteristic data with the

description of materialsand weights of all equipment as instructed by the
Engineer.

f) As-Built Drawings of existing conditions.

g) Combined Services Layout Diagrams (Coordinated with existing services)

h) Foundation and Trench Arrangement Drawings

i) Technical submittals of Equipment for:

- LT Outdoor Distribution Boards

- Miscellaneous Items (Lighting Poles)
j) Technical submittals of Equipment along with material sample for:

- Light Fixtures
- LT Cables
- Wiring Accessories
- Conduits / Pipes & Fittings
- Earthing System
- Miscellaneous Items (Cable Trays / Ladders, Switch disconnector / LBS
with weatherproof Enclosure box)
For details, refer the relevant sections of the specifications to ensure
compliance as required therein.

Technical submittals of equipment for which the material sample is not

submitted, shall be liable to rejection.
k) Testing and commissioning time table

l) Testing and commissioning protocols

m) Design Calculations/ software-based simulations:

Construction of Bridge at Korangi Causeway 8001-6 General Specifications for Electrical Works
 Based on the final approved / selected equipment/ fixture/ protective device
etc. Contractor shall perform and submit calculations to the Engineer for
review and approval. In this regard, Contractor shall perform following
software based simulations, calculations, assessment,analysis unless
required otherwise by the Engineer.

- Illumination calculations (for Street lighting) based on finally selected light

fixtures.
- Voltage drop calculation for each feeder / circuit starting from Power
Supply source (Transformer) up to point of utilization.
- Comprehensive Short Circuit software design simulations /
calculationsdetermining the maximum possible short circuit current levels.
- Selective coordination Analysis based on finally selected circuit breakers
/ fuses.
The entire LV Distribution network, starting at PMTs/ utility LT suppy and
extending up to last downstream LT Outdoor Distribution Board /
Termination device (Circuit Breaker / Load Disconnecting Switch), shall
be properly coordinated through selection of appropriate type of circuit
breaker / fuse. No additional payment shall be admissible if any higher
rating of circuit breaker / fuse is required to achieve the selectivity.
- Thermal soil resistivity measurement through field testing at site
- Earthing calculations based on actual thermal soil resistivity measured at
site.
For details, refer the relevant sections of the specificationsto ensure
compliance as required therein.

No separate payment shall be admissible for performing any software-based

simulations, design calculations, analysis, measurement, field testing
assessment, etc.Cost incurrence associated with all such scope shall deem
to have been included in the item rate of the relevant BOQ item. Any
additional payment, whatsoever, shall not be admissible in this regard.

7.2. At least three (3) copies of the shop drawings, comprehensive material
submittals and/or technical data of the equipment shall be submitted to the
Engineer for review and approval.

The Engineer will review all drawings, material submittals, manufacturer's

catalogues and design calculations and make changes as required, in order to
assist in the overall job coordination and to ensure conformance to the technical
specifications and applicable standard. The Contractor shall ensure full
compliance as commented by the Engineer on the submitted drawing,
document, material submittal, technical data, calculations and schedules etc.

Engineer's approval must be obtained before any equipment, device & material
is purchased or material fabrication is commenced. The Engineer's approval will
be general and shall in no way relieve the Contractor of this responsibility for any
work required under the Contract.

7.3. One copy of each drawing and descriptive data will be returned to the Contractor
generally marked.

(a) "APPROVED"
(b) "APPROVED EXCEPT AS NOTED"
(c) "REVISE AND RESUBMIT"
(a) "NOT APPROVED"

Construction of Bridge at Korangi Causeway 8001-7 General Specifications for Electrical Works
 Each drawing, document, material submittal, technical data, calculations and
schedules etc., which is noted as "NOT APPROVED" shall be considered
Rejected and the Contractor shall offer alternates and re-submit after making
required corrections/ compliance for Engineer’s review and approval. The
Contractor shall submit four (4) copies of the alternative offer.

Each drawing, document, material submittal, technical data, calculations and

schedules etc.,which is noted as "REVISE AND RESUBMIT" shall be re-
submitted after making corrections/ compliance for Engineer’s review and
approval. The Contractor shall submit four (4) copies of each revised issue
thereof.

Minor corrections/modifications will be necessary in the drawings, documents,

material submittal, technical data, calculations and schedules etc. marked as
"APPROVED EXCEPT AS NOTED". The Contractor may proceed ahead.
However, he shall incorporate the changes, comments, corrections etc. as
marked but does not necessarily resubmit the drawings/submittals/documents
etc. for further approval. But if the Engineer considers necessary then he may
ask the Contractor for the resubmission to verify the incorporation of
changes/comments/corrections.

Contractor is bound to submit the revised submittal within 7 days.

7.4. The Contractor must consider 21 working days (from date of receipt by Engineer
to date of dispatch from Engineer's Office) for Engineer's review of each set of
drawings/material submittals/documents etc. in his consideration of schedule of
work and in the time allowed for completion of the Contract.
7.5. The Contractor shall be responsible for any discrepancies, shortcomings,
errors or omissions in any drawings or other particulars supplied by him whether
such drawings or particulars have been reviewed by the Engineer or not.

7.6. Any delay; in the approval of the submitted material submittal, drawing,
document, technical data, calculations, and schedules etc., which is caused due
to incompleteness, shortcomings, non-submission of required information / data
etc. shall be totally attributable to the Contractor and will not be considered a
reason for extension of time (EOT).

7.7. The symbols used for the simplified representation of electrical equipment
shown on the drawings must conform to applicable NFPA, NEC, IEEE, IEC,
and/or DIN etc. Soft copies of all the applicable codes / standards as specified in
relevant clauses of different specification sections will be provided by the
Contractorto the Engineer for his reference and record.

7.8. All circuit diagrams shall be drawn in a way that they can be assembled in a
standard hard core, non-detachable binder and can be unfolded without having
to be detached.

8. MANUFACTURER'S INSTRUCTIONS

The Contractor shall supply to the Engineer in properly bound form six (6) copies of
manufacturer's instruction manuals for installation, testing, commissioning, operation and
maintenance of the specified equipment including manuals of spare parts and tools of
the equipment. At least two copies of the documents shall be submitted in original. The
installation instructions shall be submitted 2 weeks prior to commencement of installation
of each equipment, and operation and maintenance instruction at the time of
commissioning. If the Contractor fails to provide the documents,The Engineer shall
withhold issuance of requisite certificates and deduct suitable amount from the payments
to the Contractor.

Construction of Bridge at Korangi Causeway 8001-8 General Specifications for Electrical Works
9. GUARANTEE

The Contractor shall furnish written guarantee of the manufacturer or supplier with
respect to satisfactory performance of each equipment. Guarantee shall be given for
replacement and repair ofpart or whole of the equipment, which may be found defective
in material or workmanship. The guarantee shall cover the duration of Defects Liability
Period as defined in the Conditions of Contract.This guarantee shall not relieve the
Contractor of his obligations and he will be fully responsible for the repair or replacement
of any defective material in time, so as not to cause any undue delay in carrying out the
repairs and/or replacements.

10. ASSOCIATED CIVIL WORKS

Except where separately stated in the Bill of Quantities the cost of all civil works
associated with any BOQ item of electrical works, such as excavation and backfilling of
earth, compaction of the earth, foundation pads, thrust boring, chiseling, making
openings, etc. shall deemed to be included in the price quoted against respective
electrical items.

All openings made in external/internal walls, slab, ceiling, etc. for electrical works shall
be filled in after installation of equipment, laying of trays/cables etc. with suitable heat
and fire-resistant mortar, suitably rated with respect to the building fire zones so as to
ensure no ingress of water, spread of fire from one fire zone to another. All unutilized
conduit/pipe/slab opening shall be sealed with same material. Such works will also
include repair of any damage to civil works caused by the Contractor during electrical
installation.

No separate payment for such works will be made. Such works will also include repair of
any damage to civil works caused by the Contractor during electrical installation.

11. INSTALLATION INSTRUCTIONS – GENERAL

The Contractor shall install all systems components and appurtenance in accordance
with manufacturer’s recommendation and provide all necessary interconnections,
services and adjustments required for a complete functional system.

The Contractor shall provide instrumentation and communication grounding as

necessary. All penetration shall be sealed to preclude the entry of water using a silicone
material.

The Contractor shall furnish all labour, materials, tools and equipment required to install,
connect, test and commission all electrical equipment specified herein, whether or not
such equipment is furnished by him or by others.

For all equipment to be installed by the Contractor, the Contractor shall supply and install
all erection materials such as foundation bolts, washers, nuts, etc. as required and
without any additional costs.

The Contractor shall set out the works himself as per Specifications and Drawings and
shall properly position the equipment on specified foundation/location. In general, the
manufacturer's instructions for installation shall be followed. Any defect or faulty
operation of equipment due to the Contractor not following the manufacturer's
instructions shall be corrected and repaired by the Contractor at his own cost.

For any deviation from the working drawings that are deemed necessary by the
Contractor due to site conditions, he shall submit the details and obtain the Engineer
approval before starting such works.

Construction of Bridge at Korangi Causeway 8001-9 General Specifications for Electrical Works
12. FACTORY ACCEPTANCE TESTS (FAT)

12.1 Scope

Factory tests are to be carried out in the presence of both the Employer and the
Engineer. All type and routine tests onLT Outdoor Distributor, L.T Cables,
Control Cables,Plugs, Receptacles, Miscellaneous Itemsand all other equipment
shall be performed at the manufacturer's works in the presence of the Engineer
and the Employer or their representative.

Type tests may be waived off in case test certificates are submitted as certified
by an Engineer approved standard laboratory of international repute; but merely
producing the type test certificates will not relieve the manufacturerto carry out
the required standard/routine tests.

The Contractor shall submit the test procedure to the Engineer/Employer for
approval at least 4 (four) weeks before carrying out the tests.Factory test
procedures shall be drawn in accordance with relevant code/standards,
standards practices and manufacturer’srecommendation.

The Contractor shall inform the Engineer/Employer about the date and time of
test of each equipment at least two weeks in advance to allow time to the
Engineer and the Employer for preparation and travelling. This shall, however,
be done after the Contractor has got the test procedures duly approved by the
Engineer.

The Contractor shall make necessary arrangements and provide all the facilities
required for the representatives of Employer / Engineer for conductingsuch
inspection, atthe Contractor’s cost. The cost of travel shall be responsibility of
the Contractor.

The witnessing of test by the Engineer and the Employer shall not absolve the
Contractor from his responsibility for the proper functioning of the equipment,
and for furnishing the guarantees referred to in clause 9.0. All test results shall
be supplied in quadruplicate.All observations agreed on and discrepancies noted
during the inspection are to be corrected by the Contractor prior to shipment of
the equipment. Only tested equipment will be released for shipment. All test
results shall be supplied in quadruplicate.

Equipment to be supplied under this Contract shall be subject to inspection and

testing by one representative of Employer and one representative of Engineer at
its point of original manufacture or final shop assembly before its packing & and
dispatch to site. The Contractor shall make necessary arrangements and provide
all the facilities required for the representatives of Employer / Engineer for
conducting such inspection, at Contractor’s cost. The cost of travel of Employer’s
and Engineer’s representatives shall be the responsibility of the Contractor.

The Contractor shall submit tests procedures for approval of Engineer well in
advance to the set date of pre-shipment inspection. All relevant submittals, shop
drawings and requisite technical data should be approved by the Engineer prior
to the start of production.

The Contractor shall give at least 3 (three) weeks’ notice to the

Employer/Engineer for attending such inspections/tests.

All domestic FATs shall be carried out in the presence of the Employer and the
Engineer or their representatives.

Construction of Bridge at Korangi Causeway 8001-10 General Specifications for Electrical Works
 12.2 L.T Outdoor Distribution Boards

Contractor shall submit the proforma / list for essential routine tests in
accordance with the latest edition of IEC 62271-1 & 62271-200 which are to be
carried out on the proposed HT Switchboard at the manufacturer’s / assembler’s
premises during FAT for Engineer’s review during submittal review stage.

Routine tests on the proposed L.T Distribution Boards / L.T Outdoor Distribution
Boards shall be carried out at the manufacturer’s / assembler’s premises as per
relevant international standards.

Each circuit breaker shall be operated electrically and mechanically. All

interlocks and control circuits shall be checked for proper connections in
accordance with the wiring diagrams given by the manufacturer.

The Contractor shall properly identify the phases of all switchgear and cables for
connections to give proper phase sequence. Trip circuits shall be checked for
correct operation and rating of equipment served. The correct size and function
of fuses, disconnect switches, number of interlocks, indicating lights, alarms and
remotecontrol devices shall be in accordance with approved manufacturer
drawings. Nameplates shall be checked for proper designation of equipment
served. Protective relays shall be tested and set at site prior to commissioning of
the equipment. Lamp test facility will also be checked.

12.3 L.T Cables

Contractor shall submit the proforma / list for essential routine tests in
accordance with the latest edition of IEC 60502-1 / BS 6346 which are to be
carried out at the manufacturer’s premises on the offered size / rating / types of
600/1000 volt grade Multicore L.T Cables, for Engineer’s review during submittal
review stage.

Contractor shall submit the proforma / list for essential routine tests in
accordance with the latest edition of BS 6004 which are to be carried out at the
manufacturer’s premises on the offeredsize / rating / types of 450/750 volt grade
Single-core L.T Cables as well as on the offered size / rating / types of 300/500
volt grade Single-core / Multi-core L.T Cables, for Engineer’s review during
submittal review stage.

13. SITE ACCEPTANCE TEST (SAT) / FIELD TESTING

13.1 Scope

Upon completion of the installation, the Contractor shall perform field tests on all
equipment, cables, materials and systems. All tests shall be conducted in the
presence of the Engineer or his representative for demonstrating equipment or
system compliance with Specifications. The Contractor shall submit for
Engineer's approval complete details of tests to be performed describing the
procedure, test observations and expected results.

The Contractor shall furnish all tools, instruments, test equipment, materials, etc.
and all qualified personnel required for the testing, setting and adjustment of all
electrical equipment and material including putting the same into operation.

All tests shall be made with proper regard for the protection of the personnel and
equipment and the Contractor shall be responsible for adequate protection of all
personnel and equipment during such tests. The cost of any damages or
rectification work due to any accident during the tests shall be the sole
responsibility of Contractor.

Construction of Bridge at Korangi Causeway 8001-11 General Specifications for Electrical Works
 The Contractor shall record all test values of the tests made by him on all
equipment. Four (4) copies of all test data and results certified by the Engineer
shall be given to the Engineer for record purposes. These shall also include
details of testing method, testing equipment, diagrams, etc.

The witnessing of any tests bythe Engineerdoes not relieve the Contractor of his
guarantees for materials, equipment and workmanship, or as any other
obligations of Contract.

13.2 Insulation Resistance Test

Insulation resistance test shall be made on all electrical equipment by using a

meggar of 500 volts for circuitsupto 250 volts and 1000 volt for circuits between
250 and 500 volts. For testing of 11 kV circuits, upto 5 kV meggar shall be used.
The exact voltage shall be as advised by the equipment manufacturer unless
otherwise advised by the Engineer.

The insulation resistance values of cables, switchgears, etc., shall be as per

BSS, IEEE, NEC, ICEA and Pakistan Electricity Rules.

Before making connections at the ends of each cable run or joint between
cables, the insulation resistance test of each cable section shall be made. All
cables shall be subjected to high voltage test as per recommendations of
standard to which the cable is manufactured. Each conductor of a multi-core
cable shall be tested individually with each of the other conductor of the group
and also with earth. If insulation resistance test readings are found to be less
than the specified minimum in any conductor, the entire cable shall be replaced
and tests repeated on new cable. If cable joint is provided, then each cable
section shall be tested, and joint made only after the tests have been made
satisfactorily. Finally, the completed cable length including the joints shall be
tested.

The switchgears shall be given an insulation resistance measurement test after

installation, but before any wiring is connected. Insulation tests shall be made
between open contacts of circuit breakers, switches and between each phase
and earth.

If the insulation resistance of the circuit under test is less than the specified
value, the cause of the low reading shall be determined and removed. Corrective
measures shall include dry-out procedure by means of heaters, if equipment is
found to contain moisture. Where corrective measures are carried out, the
insulation resistance readings shall be taken after the correction has been made
and repeated twice at 12 hours interval. The maximum range for each reading in
the three successive tests shall not exceed 20% of the average value. After all
tests have been made, the equipment shall be reconnected as required. Polarity
test shall be made on single pole switching devices.

13.3 Earth Resistance Test

Earth resistance tests shall be made by the Contractor on the earthing system,
separating and reconnecting each earth connection.

If it is indicated that soil treatment or other corrective measures are required to

lower the ground resistance values, the Engineer will determine the extent of
such corrective measures.

The electrical resistance of the ECC together with the resistance of the earthing
leads measured from the connection with earth electrode to any other position in
the complete installation shall not exceed one Ohm. Earth resistance test shall
be performed as per Electrical Inspector's requirements. Where more than one

Construction of Bridge at Korangi Causeway 8001-12 General Specifications for Electrical Works
 earth electrodesare installed, the earth resistance test of each electrode shall be
measured by means of resistance bridge instrument.

The complete lightning protection system shall be tested for continuity and earth
resistance. The combined earth resistance at any point in the lightning protection
system shall not exceed 10 ohms.

13.4 Completed Tests

After any equipment has been tested, checked for operation, etc., and is
accepted by the Engineer the Contractor shall be responsible for the proper
protection of that equipment so that subsequent testing of other equipment do
not cause any damage to the already tested equipment.

13.5 Expenses

All expenses, i.e., traveling, documentation, boarding and lodging, allowances

etc. for carrying out the tests and witnessing by the Engineer and Employer shall
be borne by the Contractor and are deemed to have been included in the BOQ
rates of the respective equipment(s) by the Contractor.

14. SPECIAL TOOLS

The contractor shall provide special tools as indicated in Appendix-C and as may be
deemed essential for assembly, adjustment, dismantling, installation and operation
&maintenance (O&M) reasons.The total amount of Special Tools shall be carried to
relevant BoQ item.

15. STATEMENT OF COMPLIANCE

Contractor shall submit an overall in writing compliance signed and stamped with the
items of these specifications in the form of Statement of Compliance. No consideration
will be given to the bid without this important document at the bidding stage. However,
during the material submittal review stage, contractor shall submit his own proposal and
OEMs parawise compliance of relevant specification section along with each material
submittal. In absence of such compliance from the contractor and his proposed OEM,
the submittal shall be considered incomplete and will lead to rejection.

16. WARRANTY OF GOODS

The Contractor shall provide warranty of equipment as specified under the respective
section of specification for the period defined in the specifications. Effectiveness of
duration of warranty from Original Equipment Manufacturer (OEM) shall commence from
the effective date of Taking over Certificate issued by the Engineer. All warranties are to
be endorsed in the name of the Employer and an undertaking shall be submitted
from Original Equipment Manufacturer (OEM) and local representatives for ensuring
compliance of services to the Employer during Warranty Period.

17. APPENDICES TO BE FILLED IN BY THE TENDERER

The details regarding equipment manufacturers, deviations, technical data, special tools,
spare parts etc. are to be furnished in the appendices attached with form of tenders, in
accordance with the provision of the Clause “Requirements of Electrical Works” given in
the instructions to Tenderer.

18. PAYMENT

No separate payment shall be made for work involved within the scope of this section
unless specifically stated in the Bill of Quantities or herein.

*** End of Section - 8001 ***

Construction of Bridge at Korangi Causeway 8001-13 General Specifications for Electrical Works
 SECTION - 8132

LOW TENSION SWITCHBOARDS / LT OUTDOOR DISTRIBUTION BOARDS

1. SCOPE OF WORK

The work under this section consists of supplying, installing, testing, connecting,
commissioning of all material and services of the complete LT Switchboards/LT Outdoor
feeder pillar as specified herein and/or shown on the Bidding Drawings and given in the
Bill of Quantities.

The Contractor shall discuss the electrical layout with the Engineer and coordinate at site
with other services for exact route, location and position of the LT Switchboards/
LT Outdoor Distribution Boards.

The LT Switchboards/ LT Outdoor Distribution Boards shall also comply with the General
Specifications for Electrical Works Section-8001 and with other relevant provisions of the
Bidding Documents.

2. GENERAL

The LT switchboard shall be factory manufactured / assembled / routine tested either by

an Original Equipment Manufacturer (OEM) itself or by some other approved
manufacturer / assembler.

The LT Switchboards/ LT Outdoor Distribution Boards shall be of sheet steel fabricated,

floor/wall mounting, cubicle type, totally enclosed, dust tight and vermin proof. It shall be
complete in all respect with material and accessories, factory assembled, tested and
finished all according to the specifications and to the normal requirements. All wiring and
equipment for control, protection, indication, etc. required for the safe and intended
operation of the systems as specified herein or shown on the drawings shall be furnished
by the Contractor.

The outdoor LT Switchboard/ LT Outdoor Distribution Boards shall be IP-65 rated

All metal works on LT Switchboards installed outdoor / LT Outdoor Distribution Boards

shall be coated with protective paint system in accordance with ISO 12944 Corrosivity
Category “C5” with Medium Durability.

The Priming coat(s) shall be Epoxy based and top coat shall be polyurethane based with
color shade not other than RAL 7032 or 7035.

The Contractor shall submit following documents pertaining to protective paint system for
approval of the Engineer:

- Paint manufacturer’s confirmation that proposed paint system is compatible with the
intended surface to be coated.
- Paint manufacturer’s confirmation that proposed paint products are compatible with
each other.
- Paint products catalogues.
- OEM’s recommended surface preparation methodology.
- No. of coats.
- DFT per coat

Construction of Bridge at Korangi Causeway 8132-1 Low Tension Switchboards /

LT Outdoor Distribution Boards
 The LT Switchboards/ LT Outdoor Distribution Boards with all components and
accessories shall be suitable for front operation only and shall:

- be design verified assemblies as per the latest edition of IEC 61439.

- be suitable for addition of units, on either side.
- be suitable for extension of Busbar / interfacing with other L.T. Switchboard
- have a rated service short circuit breaking capacity, (Ics) at 415 V AC conforming to
IEC 60947-2 and / or as shown on the drawings.
- be provided with adequate clearance from live parts so that flashovers cannot be
caused by switching, vermin, pests, etc.
- have all components rated for insulation class of 600-volt minimum.
- be designed for flush mounting of all instruments on the front side.
- have incoming and outgoing cable termination arrangement, terminal blocks, line-up
terminals, etc.
- have all incoming and outgoing connections from the bottom or with appropriate
provision for top entry as per site requirements.
- have the components mounted so as to facilitate ease of maintenance from the
front.
- have wiring diagram in the pocket on the inside of each door of the panel.
- be suitable for 400 volts AC, 3 phase 4 wire, 50 Hz system.
- be labeled with stainless steel nameplate on the front side of door for each incoming
and outgoing circuit.
- have doors grounded by flexible copper cable/strip.
- have arrangements for extension of panel in future.
- have common lamp test facility for all lamps.

3. APPLICABLE STANDARDS/CODES

The latest editions of the following standards and codes shall be applicable for the
materials specified within the scope of this Section:

IEC 61439 - Low Voltage Switchgear and Control gear

Assemblies (All Parts)

IEC 60947-3 - Low Voltage Switchgear and Control Gear-Switches,

Disconnector, Switch-disconnector and Fuse Combination Units.

IEC 60947-2 - Low Voltage Switchgear and Control Gear-Circuit

Breakers for Moulded Case Circuit Breakers (MCCBs) and Air
Circuit Breakers (ACBs)

IEC 60831 - Shunt Power Capacitors of self- heating type AC systems having
a rated voltage upto and including 1000V

IEC 60073 - Basic safety principles for man-machine interface, marking and
identification. Coding principles for indicators and actuators

IEC 61869-2 - Instrument Transformers – Additional requirements for Current

Transformers

Construction of Bridge at Korangi Causeway 8132-2 Low Tension Switchboards /

LT Outdoor Distribution Boards
 IEC 61869-3- Instrument Transformers – Additional requirements for Inductive
Voltage Transformers

IEC 60051-1, - Direct acting indicating analogue electrical measuring

2, 3, 5 & 8 instruments and their accessories

IEC 60898-1 - Electrical Accessories- Circuit breakers for over current

protection for household and similar installations – Circuit
breakers for AC operation

IEC 60051-2 - Direct acting indicating analogue electrical measuring

instruments and their accessories. Special requirements for
ammeters and voltmeters

IEC 60871-1 - Shunt Power Capacitors for AC power systems having a rated
voltage above 1000V - General

IEC 60947-4-1 - Low Voltage switchgear and control gear – Contactors and
motor starters – Electromechanical contactors and motor
starters.

BS EN 60529 - Degrees of protection provided by enclosures (IP Code)

BS EN 13601 - Copper and copper alloys: Copper rod, Busbar and wire
for general electrical purposes.

IEC 60269 - Low Voltage fuses

.
BS 88-2 - Low Voltage Fuses. Supplementary requirements for fuses for
use by authorized persons (fuses mainly for industrial
application). Examples of standardized systems of fuses A to K.

ISO-12944-2 - Corrosion Protection of Steel Structures by Protective Paint

Systems

4. MATERIAL

4.1 Sheet Metal Work

The Switchboards shall be fabricated, welded, grinded, finished with angle iron
framework and cladded with 14 SWG MS sheet. It shall be suitably divided into
panels and compartments for accommodating the required number of circuit
components, instruments and accessories in accordance with the specified form
of internal separation.

The switchboard shall be supplied complete with foundation bolts and other
installation materials as recommended by the manufacturer. Proper size cable
clamping channels with galvanized steel clamps and brass cable glands
respectively for unarmoured and armoured cables shall be provided. All holes,
cutout shall be tool or jib manufactured and free from burrs and rough edges. An
earth bar of appropriate cross section shall be provided and connected to the
bodies of all sections of the switchboard. Two external earth terminals shall be
provided for main earth connection to the body of switchboard. The doors shall
be earthed by means of flexible copper strip. Means shall be provided to limit the
0
opening angle of doors to about 100 .

The cabling inside the switchboard shall be suitably numbered and harnessed by
means of straps or cords. Colour sleeves shall be provided on each cable lugs,
connected to the bus bars, circuit breakers or terminals etc. for phase
identification. Wiring to door mounted components shall be in flexible PVC

Construction of Bridge at Korangi Causeway 8132-3 Low Tension Switchboards /

LT Outdoor Distribution Boards
 conduit. All indicating, selecting and control equipment shall be suitably arranged
and clearly labelled by means of flame proof material using indelible ink/marking
indicating the rating of fuse, switches, etc. The nameplates provided on the front
of panel shall be of flame retardant material preferably stainless steel. Use of
plastic or any inflammable material shall not be permitted for nameplates.

4.2 Components

The switchboards shall be provided with all components as specified or shown

on the Drawings and as necessary for the satisfactory operation of the
switchboard and of the electrical system. Typical specifications are given here
under.

4.2.1 Bus Bars

The bus bars shall be made of 99.99% pure high conductivity electrolytic
tinned copper and shall be completely insulated by heat shrink colored
sleeves of specified voltage grade. And mechanically braced for the
specified fault level according to relevant IEC standard. The phase
identification of bus bars shall be by providing colours sleeves on bus
bars ends and these shall be red, yellow and blue for phase and black
for neutral. The earth bus bar shall be green. The thickness of tinning on
bus bars shall be adequate enough to ensure perfect protection against
corrosion beside ensuring specified rated ampacity.

The bus bars shall be triple pole, neutral & earth and shall be of
appropriate size to meet the electrical and mechanical requirements of
the system. The temperature rise of bus-bars, at rated current, shall not
0
exceed 30 C above the specified ambient temperature.

Neutral bus bar shall be of the same cross section as phase bus bars.
Earth bus bar shall be of half cross section area as phase bus bars.

Contractor shall submit manufacturer verified bus bar sizing calculations

along with supporting documents considering all applicable de-rating
factors for Engineer’s review and approval.

4.2.2 Circuit Breakers

The circuit breaker shall be triple/four pole, current limiting type,

manually operated or motor operated, spring charged type as shown
on the drawings with front drive grip handle. ON-TRIP-OFF indication
shall be provided on circuit breakers. The Circuit breakers shall have the
following protections and setting range unless otherwise shown on the
drawings:

- Adjustable three pole, manual reset thermal overload release of

setting range 80 to 100% of rated current.

- Magnetic triple pole short circuit release having range according

to manufacturer's standard range.

The incoming circuit breakers of main LT panel (normal and emergency)

shall be either air circuit breakers or moulded case type, whereas
outgoing circuit breakers of main LT panel shall be moulded case type,
unless stated otherwise on the drawings. Wherever Air circuit breaker is
specified on the drawing, these shall be 4-Pole, motorized, withdrawable
type, having LSIG protection.

The incoming circuit breaker shall have two numbers normally open and
two numbers normally closed auxiliary contacts rated for 2 Amp, 230

Construction of Bridge at Korangi Causeway 8132-4 Low Tension Switchboards /

LT Outdoor Distribution Boards
 VAC. The incoming circuit breaker shall also have ON-TRIP-OFF
indicating lamps. Where shown on the drawings indication lamps shall
also be provided for outgoing circuit breakers. Generally, the circuit
breaker shall have specified rupturing capacity without the use of back-
up fuses. However, if required and / or as mentioned on the drawings,
appropriately rated HRC fuses shall be provided as backup protection to
ensure a faster tripping in case of abnormally higher fault currents.
Auxiliary release and trip coils shall be provided for desired operation
and/or interlockings as stated on the drawings and/or as needed per
system operational requirement.

The motor operated, spring charged type circuit breakers shall be

provided with anti-pumping circuit to prevent repeating cycle of TRIP
reset and ON even if the close command is given while the circuit
breaker has tripped due to fault.

Unless specified otherwise by the Engineer, the entire main

LT Switchboard including all Incoming and outgoing circuit breakers shall
be “Withdrawable type” and these switchboards shall also comply with
the following requirements:

- All circuit breakers and / or switch fuse units shall be as shown

on the drawing. Where two or more feeders are contained in the
same cubicle, they are to be separated by barriers of steel or fire
resistant insulating material. If required, the metal surface of the
cubicle shall be protected by fire resistant insulating material.
Each panel shall combine in tier form all respective components
with their incoming and outgoing power feeders.

- The draw out switching units shall be mounted on trucks or slide-

in chassis having adequate guidance by greased sliding rails
and/ or rollers. They shall be connected to the bus bars by
means of a self-aligning plug and socket arrangement and
complete isolation of each circuit shall be attained by drawing
out the switching unit.

- The main contacts shall have safety shutters, which will

automatically cover the line contacts as the circuit breaker is
withdrawn. The withdrawal of circuit breaker shall be
accomplished by means of a crank, with as little effort as
possible.

- The contact surfaces of the plugs and sockets shall be silver-

plated. The contacts shall be of ample size and sufficiently
strong to withstand maximum prevailing short circuits and carry
continuously their normal rated currents without damage or
overheating of any kind. Also, the control circuits shall be
provided with plugs and sockets.

- The withdrawable units shall have clearly marked service, test

and isolated (ready for complete withdrawal) positions. A
mechanical interlock is to be provided to prevent withdrawal of
the unit unless the power circuit has been interrupted. The unit
shall, furthermore, positively be locked in the test position before
it is manually released for complete withdrawal.
- All components required to make a fixed type circuit breaker
withdrawable, such as, chasis, plugin plates, side plates etc,
shall be duly supplied by the Contractor with all necessary
details.
4.2.3 Switch - Fuse Units

Construction of Bridge at Korangi Causeway 8132-5 Low Tension Switchboards /

LT Outdoor Distribution Boards
 The switch-fuse unit shall comprise a triple pole on load isolating switch
with HRC fuses. The fuse shall be supplied complete with the fuse base
and shall conform to BS-88 Class Q1 with a fusing factor of 1.5.

4.2.4 Three Phase Energy Meters (Kilowatt Hour Meters)

Three phase or Single phase energy meters of frequency 50 Hz and

accuracy class of 1.0 with proper meter base, cover, frame, terminal
block, terminal cover, auxiliary circuit etc. shall be provided for use with
instrument transformers.

The construction of meter shall be suitable for its purpose in all respect
and shall give reasonable assurance of permanence in all mechanical,
electrical and magnetic adjustments. The construction shall be such that
the meter is not prone to produce appreciable noise in use.

The meter shall have a dust proof case, which can be sealed in such a
way that the mechanism of the meter is only accessible after breaking
the seal. The case shall be made of metal or toughened glass of a
sufficient strength to ensure adequate protection of the internal parts.

The direction of rotation shall be marked by a clearly visible indelible

arrow.

Electronic meters with same accuracy class can also be provided.

4.2.5 Ammeters and Voltmeters

All meters shall be flush mounting, moving iron, spring controlled. The
front dimensions shall be 96 x 96 mm for meters.

The meters shall be of accuracy class 1.5 according to relevant IEC

standard. The ammeter shall be suitable for connection to 5 Amps
secondary of current transformers or directly through shunt as shown on
drawings. The ammeters and voltmeters shall have measuring range as
indicated on the drawings.

Electronic meters with same accuracy class can also be provided subject
to no additional cost.

4.2.6 Current Transformers

Air-cooled, ring type current transformers shall be provided having

transformation ratio as indicated on the drawings. The current
transformers shall be of suitable burden having accuracy class 1.0
according to IEC 61869-2 or relevant standard. The current transformers
shall have 5 amps secondary.

4.2.7 Selector Switches

Ammeter and voltmeter selector switches shall be complete with front

plate and grip handle. R-Y-B and OFF position for ammeters and
RY-YB-BR-RN-YN-BN and OFF position for voltmeters shall be marked
on the respective selector switches.

The selector switches for controls shall be rotary cam type, having
required number of positions. It shall be provided complete with knob
and front plate showing all positions as required.

Construction of Bridge at Korangi Causeway 8132-6 Low Tension Switchboards /

LT Outdoor Distribution Boards
 4.2.8 Air Break Contactors

The contactors shall be air break, triple pole 400 VAC type and suitable
for the type of duty (at least utilization Category AC3) to be performed
and AC6b when used inside Power Factor Improvement plant to perform
capacitor bank switching. The main contacts shall be silver tipped, butt
type with double break per pole. Each contactor shall be provided with
single phase 230 VAC operating coil and minimum two spare normally
open and one normally closed auxiliary contact. The number of working
auxiliary contacts shall be provided according to the system
requirements.

The Magnetic Contactors when used for Motor Starter circuit shall be
type-2 coordinated with the backup protection. That is under short circuit
conditions; the contactor and starter shall cause no danger to persons or
installation and shall be suitable for further use.

4.2.9 Push Buttons

The push buttons shall be illuminated, momentary make/break contact

type or latch type (push-on/push-off) as required and approved by the
Engineer and suitable for flush mounting. The push button for ON and
OFF switching shall be red and green respectively.

4.2.10 Impulse Relay

Impulse Relay shall be 1 or 2 pole, 250 V rated and be provided with

latching mechanism.

4.2.11 HRC Fuses

HRC fuses shall be provided complete with fuse bases, fuse and trip
indicator etc. The fuses shall have a fusing factor as specified for class
Q1 in accordance with BS 88.

4.2.12 Indicating Lamps

Indicating lamps shall be LED type suitable for flush mounting, complete
with base. They shall be suitable for operation on 230V AC or 60V DC/
110V DC and it shall have rosettes of suitable colours as approved by
the Engineer.
4.2.13 Line up Terminals

Line up terminals wherever provided for control or power circuits shall be

suitable for voltage and size of conductors as indicated on drawing.

The line-up terminals for controls shall be suitable for channel mounting.
All necessary accessories such as end plates, fixing clips, transparent
label holder caps and label sheets with marking shall be provided.

4.2.14 Auxiliary Relays

The auxiliary relays used for control purposes shall generally be provided
with operating coil voltage rating 230 volts AC, 50 Hz. The auxiliary
relays shall have appropriate number of pins/contacts as required for
normal operation of the system. Use of different types and makes shall
be avoided as much as possible.

Construction of Bridge at Korangi Causeway 8132-7 Low Tension Switchboards /

LT Outdoor Distribution Boards
 4.2.15 Programme Selector Switches

Programme selector switches shall be rotary or cam type, 2-position,

2-pole and 3-position, 3-pole as required, complete with knob and front
plate with position indication.

4.2.16 Surge Protection

Surge Arresters shall be provided in L.T. switchboard, wherever

required, as shown on drawing. The Contractor shall submit proper
calculations for the Surge protection device (SPD) rating and the SPDs
shall be adequately sized for 400 Volts and shall have the following
characteristics:

- Voltage Class (highest system voltage): 440 V rms

- Service (rated voltage): 400 / 1.732 kV rms

This equipment will be tested in accordance with the relevant IEC

Standard.

4.2 Warranty

All proposed L.T Switchboards (complete set including all equipment, devices,
components, parts etc.) will include a warranty of at least 2 years from his
proposed Original Equipment Manufacturer (OEM). The warranty period shall
commence upon issuance of the Taking Over Certificate (TOC). Effectiveness of
duration of warranty from Original Equipment Manufacturer (OEM) shall
commence from the effective date of Taking Over Certificate issued by the
Engineer. All warranties are to be endorsed in the name of the Employer and an
undertaking shall be submitted from Original Equipment Manufacturer (OEM)
and local representatives for ensuring compliance of services to the Employer
during Warranty Period. The cost incurred for such warranty shall deem to have
been included in the item rate of relevant BOQ item. No additional payment,
whatsoever, shall be admissible in this regard and for extended warranty, if any.

5 INSTALLATION

The LT Switchboards/ LT Outdoor Distribution Boards shall be installed at location shown

on the drawing or as advised by the Engineer. The concrete pedestal shall be
constructed as per relevant specifications for civil works. The Contractor shall be
responsible to ensure co-ordination with the civil works for providing any openings, holes,
etc., to avoid any breakage to completed works. In case the provisions in civil works for
installation of electrical equipment are not made or made incorrect the same shall be
rectified by the Contractor at his own cost and to the satisfaction of Engineer.

The Contractor shall provide foundation bolts and grout them in cement concrete floor
using non-shrinkable material with the approval of Engineer.

All installation materials for physically erecting the switchboard such as bolts, nuts,
washers, supporting steel, etc., shall be provided and installed by the Contractor.
The Switchboard, Automatic Transfer Switch (ATS) and LT Outdoor Distribution Boards
shall be installed upright and in level and shall be firmly and rigidly bolted to the floor and
concrete supports.

The LT switchboard / LT Outdoor Distribution Boards shall be completely erected as per

manufacturer's instructions and as approved by the Engineer. Loose parts dispatched by
the manufacturer shall be installed and connected as per assembly drawing provided by
the manufacturer. Any safety locking of meter, relays, etc., provided by the manufacturer
for safe transport shall be released only after the switchboard is erected in position. The

Construction of Bridge at Korangi Causeway 8132-8 Low Tension Switchboards /

LT Outdoor Distribution Boards
 incoming and outgoing cables shall be connected as recommended by cable
manufacturer and providing color sleeve on the lugs at both ends of cables the cable
armour shall be connected effectively to ground.

The control system components, devices, and wiring etc. shall be installed as per
manufacturer’s instructions and recommendations. After installation, the equipment shall
be sequentially tested to confirm that the required switching is effective. The tests shall
be carried out in the presence of the Engineer and to his entire satisfaction.

The switchboard body shall be connected to earth as per instructions given in section
"Earthing" of these Specifications. The switchboard shall be tested and commissioned in
the presence of the Engineer.

The LT Switchboards / LT Outdoor Distribution Boards shall be tested before energizing

as per instructions contained in article "Testing" of General Specifications for Electrical
Works, Section-8001 of these Specifications.

No separate payment for supplying, installing the control cables for the complete system
and testing and commissioning of the entire system is admissible and is deemed to have
been included in the BOQ rates for LT Switchboards / LT Outdoor Distribution Boards.

6 MEASUREMENT AND PAYMENT

6.1 General

The Contractor's bid amount against Bill of Quantities items as given below shall
include design, manufacturing, fabrication, supply, installation, testing,
commissioning and completion for all works specified herein and as shown on
the Tender Drawings related to the item.

6.2 LT Switchboards / LT Outdoor Distribution Boards

6.2.1 Measurement

Measurement shall be made for the number of each LT Switchboards /

LT Outdoor Distribution Boards given in BOQ acceptably supplied and
installed by the Contractor as a complete job.

6.2.2 Payment

Payment shall be made for the total number of each type of job
measured, as provided above, at the Contract unit price each and shall
constitute full compensation for design, manufacturing, fabricating,
supplying, installing, connecting, interfacing, testing and commissioning
of the LT Switchboards / LT Outdoor Distribution Boards as per single
line diagram shown on the drawing alongwith Power Factor Improvement
Plant (including main circuit breaker, Multi-stage power factor correction
relay, AC6b magnetic Contactors, HRC Fuses, Detuned Harmonic Filter
Reactors including it design calculations, all controls / indications etc.) ,
all erecting material such as foundations bolts, supporting steel
channels, nuts, washers, cable glands etc., complete with foundation
and all related Civil works.

6.3 Protective Paint on LT Switchboards / LT Outdoor Distribution Boards

No separate payments shall be made for the under mentioned specified work
related to the supply and installation of LT Switchboards / LT Outdoor Distribution
Boards. The cost thereof shall be deemed to have been included in the quoted
rates of above work.

Construction of Bridge at Korangi Causeway 8132-9 Low Tension Switchboards /

LT Outdoor Distribution Boards
 - Protective paint system on metal works of LT Switchboards installed outdoor
/ LT Outdoor Distribution Boards in accordance with ISO 12944 Corrosivity
Category “C5” with Medium Durability.
- Civil works for foundation

***** End of Section 8132 *****

Construction of Bridge at Korangi Causeway 8132-10 Low Tension Switchboards

/
LT Outdoor Distribution Boards
 SECTION - 8150

LIGHT FIXTURES

1. SCOPE OF WORK

The work under this section consists of supplying, installing, testing and commissioning
of all material and accessories of the complete Light fixtures as specified herein and/or
shown on the Tender drawings and given in the Bill of Quantities.

The Contractor shall discuss the electrical layout with the Engineer and co-ordinate at
Site with other services for exact locations and positions of the light fixtures

The lighting fixtures with accessories shall also comply with the General Specifications
for Electrical Works, Section-8001 and with other relevant provisions of the Tender
Document.

2. GENERAL

The description of light fixtures is given in the bill of quantities, and stated on the
drawings, and all relevant material is described in this Section.

The determination of quality and quantity will be established on internationally accredited

rd
3 party laboratory based certified photo-metric data covering the coefficient of
utilisation, light distribution curves, construction material, shape, finish, operation, etc.
The Contractor shall submit the certified photometric data and type test certificates for
each proposed /offered light fixture for the Engineer’s review and approval. The type test
certificates must comply with the requirement laid down in the relevant standard.

The Contractor shall submit at least one sample of each and every light fixture specified
and obtain approval of the Engineer before purchasing. The light fixture, for which the
material sample is not submitted, shall be liable to rejection. The quality and finishes of
the light fixtures shall be as required and specified in the relevant section of this
specification. The accessories such LED drivers, LED Chips, LED opticsetc., for all type
of light fixtures, shall be of approved manufacturer. Approved equivalent against those
specified will be accepted if the specified one is/will not be available. For any substitution
the Engineer's approval is necessary. However, if any approved equivalent light fixture
has any additionalfeatures including lumen output then no extra payment shall be
admissible.

Light fixtures offered by the authorized local distributor / supplier shall only be considered
for review subject to submission of following documents by the Contractor:

- Authorization / conformance certificate from the Original Equipment Manufacturer

(OEM) in favor of the respective authorized local distributor / supplier for the supply
and distribution of light fixtures.
- Detailed company profile of the Original Equipment Manufacturer (OEM) comprising
information regarding Country of origin, reference list of similar works done /
products installed by the OEM indicating the name of customer, description and
quantity of product, year of supply etc.
All fixtures shall be finished in standard color schemes as mentioned in the
manufacturer's catalogue for respective fixtures, unless specifically stated in the
Specifications, Drawings or Bill of Quantities or directed by the Engineer.

All proposed luminaires/Light fixtures and the associated drivers/Controlgears will

include a warranty of at least 2 years from his proposed Original Equipment
Manufacturer (OEM). The warranty period shall commence upon issuance of the Taking
Over Certificate (TOC). Effectiveness of duration of warranty from Original Equipment

Construction of Bridge at Korangi Causeway 8150-1 Light Fixtures

 Manufacturer (OEM) shall commence from the effective date of Taking Over Certificate
issued by the Engineer. All warranties are to be endorsed in the name of the Employer
and an undertaking shall be submitted from Original Equipment Manufacturer (OEM) and
local representatives for ensuring compliance of services to the Employer during
Warranty Period. The cost incurred for such warranty shall deem to have been included
in the item rate of relevant BOQ item. No additional payment, whatsoever, shall be
admissible in this regard and for extended warranty, if any.

3. APPLICABLE STANDARDS/CODES

The latest editions of the following standards/codes shall be applicable to the material
specified within the scope of this section:

IEC 60598-1 - General requirements and tests

IEC 60598-2-1 - Particular requirement- Fixed general purpose luminaire

IEC 60598-2-2 - Particular requirement- Recessed luminaries

IEC 60598-2-3 - Particular requirement- Road and Street lighting

IEC 60598-2-5 - Particular requirement – Flood Lights

IEC 62471 - Photo biological Safety of lamps and lamps system

IEC 62031 - LED modules for general lighting – Safety specifications

IEC 62262 - Degrees of protection provided by enclosures for

electrical equipment against external mechanical
impacts (IK code)

BS EN 55015 - Limits and methods of measurement of radio

disturbance characteristics of electrical lighting and
similar equipment

BS EN 61547 - Equipment for general lighting purposes/ -

EMC immunity requirements.

BS EN 61000-3-2 - Electromagnetic compatibility (EMC) -

Limits for harmonic currents emissions.

BS EN 61000-3-3 - Electromagnetic compatibility (EMC) - Limits for voltage

fluctuation and flicker in public LV systems.

BS EN 62493 - Assessment of lighting equipment related human

exposure to electromagnetic fields

LM79 / LM80 /LM82 - Test Reports for the offered luminaires

BS 5266 - Emergency lighting

ISO 7010 - Signs for the purposes of accident prevention,

Fire protection, health hazard information and
Emergency evacuation.

The LED driver shall fully conform to following standards:

BS-EN 61347-1 - Lamp control gear - General and safety requirements.

Construction of Bridge at Korangi Causeway 8150-2 Light Fixtures

 BS-EN 61347-2-11/13 - Lamp control gear –Part-2-11 / Part 2-13
Particular requirements

BS EN 62384 - DC or AC supplied electronic control gear for LED

modules performance requirements
4. MATERIAL

4.1. LED Batten type Light Fixture

The Contractor shall furnish and install the complete LED Batten luminaire of
proper rating as shown on the drawings, specified in Bill of Quantities and/or as
required by the Engineer.

For the description of luminaire including its IP degree of protection, dimensions,

minimum luminous flux, and minimum luminous efficacy, the “Legend & Light
Fixture Schedule” drawing shall be referred.

The luminaire shall have colour temperature of 4000K Colour rendering index
(CRI) shall be greater than 80. The LED shall have colour consistency preferably
within 5 SDCM (standard deviation of colour matching).

The LED luminaire shall be designed for lumen maintenance of L70B50 at the
end of useful life. The complete luminaire shall have a useful life of at least
50,000 burning hours.The luminaire shall be suitable for operating at an ambient
temperature of upto +40 degree Celsius.

The housing shall be made of SPCC cold rolled steel material suitable for indoor
environment whereas optic shall be made of Polycarbonate material with Opal
finish. Optical cover / lens type shall be of Polymethyle material with polymer
plastic bowl / cover finish and stainless-steel fixation material to achieve the
required beam symmetry.

Appropriate size bushed wire entry holes, fixing holes, and earth terminal shall
be provided to suit the installation requirement. The driver shall be fixed output
type and integrated within the luminaire and must be adequately protected
against heating effect. The internal wiring of LED batten light fixtures shall be
done with heat resistant wires at the manufacturer's factory. The internal wiring
shall be clipped properly and heat resistant sleeves be provided on cables
passing near driver. Connectors suitable for connecting 2.5 sq.mm cable
conductors shall be provided for supply connections. An earth terminal for
connection to 2.5-sq.mm cable conductor shall be provided.

The luminaire shall have provision of surface, wall mounting as well as

suspended arrangement as specified on the drawings or in BOQ and as
approved by the Engineer. All installation accessories including mounting clips
etc. shall be provided as per installation requirement at site.

The light fixture shall be designed to comply the IK03 category’s impact
requirement unless required otherwise.

4.2. Corrosion Resistant LED Street Light Fixture

The Contractor shall furnish and install the complete Corrosion Resistant LED
Street Light Fixturesof proper rating as shown on the drawings, specified in Bill
of Quantities and/or as required by the Engineer.

The Contractor shall submit “Natural Salt Spray Test Report” for the proposed
Flood light fixture for Engineer’s review to ensure its application being suitable

Construction of Bridge at Korangi Causeway 8150-3 Light Fixtures

 for harsh outdoor environment. The street light fixture, for which the required
“Natural Salt Spray Test Report” is not submitted, shall be liable to rejection.

For the description of Light fixture including its IP degree of protection, salt spray
testing hours, minimum luminous flux and minimum luminous efficacy, the
“Legend & Light Fixture Schedule” drawing shall be referred.

The luminaire shall have colour temperature of 4000K, with colour rendering
index (CRI) of greater than 70. The LED shall have colour consistency preferably
within 5 SDCM (standard deviation of colour matching).

The system should be designed in a way that it ensures higher uniformity along
with a smooth light of higher colour consistency & system efficiency.

The LED luminaire shall be designed for lumen maintenance of L70B50 at the
end of useful life. The complete luminaire shall have a useful life of at least
100,000 burning hours.The luminaire shall be suitable for operating at an
ambient temperature of upto +50 degree Celsius.

The housing will include optical system, LED light source, integrated heat sink,
SPD and driver. It shall be made of non-corrosive high pressure aluminium die
cast material, optic made of polycarbonate material with thermally hardened
glass front cover, heat resistant silicon rubber gasket in optical LED
compartment, programmable driver and fixation material made of aluminium. It
shall be salt spray tested as required with required beam light distribution optics,
along with 15 kV built in surge protection. The light fixture should have flexible
optical system to achieve lighting parameters for required class of roads.

The heat sink shall be designed to create better air-flow for better heat transfer.
Appropriate size bushed wire entry holes, fixing holes, and earth terminal shall
be provided to suit the installation requirement. The programmable driver which
can carry control signal through neutral; cable shall be integrated within the
luminaire and must be adequately protected against heating effect.

The luminaire shall have provision of pole mounting arrangement as specified on

the drawings or in BOQ and/or as required/approved by the Engineer. All
installation accessories including mounting supports etc. shall be provided as
per installation requirement at site.

The light fixture shall be designed to comply the IK08 category’s impact
requirement unless required otherwise.

5. INSTALLATION

5.1. General

The mounting heights of light fixtures are indicated on the drawings, and
positions of fixtures are according to the mentioned scale.

The Contractor must ensure that the light fixtures are installed uniformly with
respect to the dimensions of the area. Any modifications due to site conditions
may be made with the approval of Engineer. All fixtures shall be carefully aligned
before fixing in position.

The wiring between ceiling rose or terminal box and the fixture shall be carried
out with 3-core 1.0 sq.mm and 1.5-sq.mm flexible copper conductor PVC/PVC
cable respectively for circuits protected by 10 amps and 15/20 amps MCBs. The
wiring inside light fixture body shall be done with heat resistant cables or PVC
insulated cable in heat resistant sleeves as approved by the Engineer.

Construction of Bridge at Korangi Causeway 8150-4 Light Fixtures

 Glasses, shades, reflectors, diffusers, etc., must be in a clear condition after
installation. All light fixtures shall be earthed by an earth wire connected to the
earth terminal in the fixture.

5.2. Surface Mounted Light fixtures (LED Batten)

Light fixtures on the surface of LT outdoor Distributor shall be installed with the
back of the body flush with the surface, and in a manner so as to facilitate wiring.
Nylon plugs and galvanized steel bolts or screws shall be used for fixing the light
fixture to the ceiling of LT Outdoor Distributor.

5.3. Corrosion Resistant LED Street Light Fixture

LED Street light fixture shall be installed Hot Dipped Galvanized, with ISO-
12944, corrosivity category “C3” medium durability painted, Mild Steel, poles and
arm as described in Contract specification section-8920 finished with high-
performance epoxy paint and arm as specified in B.O.Q, and “General detail”
drawing. The light fixture shall be mounted considering that the pole is fixed type
and light fixtures are not damaged during maintenance.

The lighting fixture shall be properly levelled and the luminaire shall be adjusted
to the appropriate position and all screws, bolts checked for tightness, etc. The
light fixture shall be connected to the supply and earth at the proper terminals in
the fixture.

6. MEASUREMENT AND PAYMENT

6.1. General

The Contractor's bid amount against each Bill of Quantities item as given below
shall include supply, installation, testing, commissioning and completion for all
work specified herein and/or shown on the Bidding Drawings related to the item.

6.2. Corrosion Resistant LED Street Light

The Contractor's bid amount against each Bill of Quantities item as given below
shall include supply, installation, testing, commissioning and completion for all
work specified herein and/or shown on the Bidding Drawings related to the item.

6.2.1 Measurement

Measurement shall be made for each type of light fixture including all
accessories acceptably supplied and installed by the Contractor as
complete unit.

6.2.2 Payment:

Payment shall be made for the number of units measured as provided

above at the contract unit price each and constitute full compensation for
supplying, installing, connecting, testing and completion ofCorrosion
Resistant LED Flood Light / Corrosion Resistant LED Street Light
including all accessories such as LED drivers, LED Chips, LED
optics,connecting cables & connectors, suspension rods and pendent
arrangement, GI pipe bracket, ceiling supports, internal wiring, nuts,
bolts, screws, etc., as required and complete in all respects.

***** End of Section – 8150 *****

Construction of Bridge at Korangi Causeway 8150-5 Light Fixtures

 SECTION - 8212

LOW TENSION CABLES

1 SCOPE OF WORK

The work under this section consists of supplying, installing, testing and commissioning
of all material and services of low tension (LT) cables and the accessories as specified
herein or as shown on the Tender Drawings and in the Bill of Quantities.

The Contractor shall discuss the electrical layout with the Engineer and coordinate at
site with other services for exact route, location and position of the L.T. cables.

The LT cables with accessories shall also comply with the General Specifications for
Electrical Works, Section-8001 and with other relevant provisions of the
TenderDocument.

2 GENERAL

- All multi-core and single core PVC insulated and sheathed cables for light
circuits, socket outlets and circuits operating upto 250 volts shall be 300/500
volts grade.

- All single core PVC insulated, non-sheathed cables shall be of 450/750-volt

grade.

- Power cables for main feeders, main to sub main feeders, power equipment,
etc., armoured or unarmoured shall be of 600/1000 volt grade.

- Armouring of multi-core/ single core cables shall be done with appropriate size
galvanized steel/aluminium wire as per relevant codes.

The conductors shall be stranded high conductivity, soft annealed copper. Conductors of
single core cables shall be circular, whereas of multi-core cables may be circular or
shaped according to standard practices and codes. The PVC insulation, bedding and
overall sheath shall be of extruded PVC compound having good flexibility, resistance to
ageing and ability to withstand deformation at high temperatures. Non-hygroscopic filler
shall be provided in multicore cable to fill empty gaps between the cores to make the
cable a smooth round finish. In all shaped cables a non-hygroscopic high strength
binding tape shall be provided on the core assembly. All cables shall be treated for
vermin proofing and be protected against rodents during storage, laying and all
protective pipe/sleeves shall be plugged to attain the same after installation.

Embossed marking on the oversheath at 3 meters intervals shall give the following
information:

- Name of Manufacturer
- Yearof Manufacture
- No. of cores and size of cable in sq.mm.
- Voltage grade
- Type of cable i.e., Cu./PVC/SWA/PVC

3 APPLICABLE STANDARDS/CODES

The latest editions of the following standards and codes shall be applicable for the
materials specified within the scope of this section:

Construction of Bridge at Korangi Causeway 8212-1 Low Tension Cables

 BS 6004 - Electric cables PVC insulated, non armoured cables for
voltages upto and including 450/750 volts for electric power,
lighting and internal wiring

BS 6346 - Electric cables PVC insulated, armoured cables for voltages of

600/1000 V and 1900/3300 V

BS 7846 - Electric cables 600/1000V armoured fire resistant cables having

thermosetting insulation and low emission of smoke and
corrosive gases when affected by fire

BS 7889 - Electric cables. Thermosetting insulated, unarmoured cables for

a voltage of 600/1000 V, for fixed installations

IEC 60227 - Polyvinyl chloride insulated cables of rated voltages upto and
including 450/750V

IEC 60332 - Tests on electric and optical fibrecables under fire conditions

BS 6746 - PVC insulation and sheath for electric cables

BS EN 60228 - Conductors of insulated cables

BS EN 50525 - Electric cables - Low voltage energy cables of rated voltages up

to and including 450/750 V

BS EN 61386 - Conduit systems for cable management

BS EN 50618 - Electric cables for photovoltaic systems

4 MATERIAL

4.1 General

The power, lighting and control cables shall be furnished and installed in
accordance with most appropriate routes, well-coordinated with other services,
for interconnection of electrical and mechanical equipment, fixtures etc., shown
on the drawings.

All cables shall have phase identification colours on insulation of each core. The
colour code for three phase circuits shall be red, yellow and blue for phase
conductors and black for neutral conductor. Where insulated earth conductor is
installed, it shall have green or green-yellow colour insulation.

Single-phase circuits shall have insulation of red colour for phase/line, black
colour for neutral and green or green-yellow colour for earth conductor.

All DC circuits shall have insulation of white colour for positive, black colour for
negative and green or green-yellow colour for earth conductor.

The ends of each length of multi-core armoured or unarmoured cables shall be

properly marked for clock-wise and anti-clock-wise sequence of core colours.

4.2 Cables for Conduit or Channel Wiring

All cables/wiring in concealed PVC or surface mounted GI conduits or in

covered channel shall be single core PVC insulated of specified grade and size,
unless specifically shown on the drawings or given in BOQ.

Construction of Bridge at Korangi Causeway 8212-2 Low Tension Cables

 4.3 Cables on surface/concrete trenches / trays

Cables for distribution system to be installed on surface, in cable ducts, in

concrete trenches or on trays shall be single or multi-core PVC insulated and
PVC sheathed of specified voltage grade and size, unless specifically shown on
the drawings or given in BOQ.

4.4 Cables inside solid bottom surface M.S Trunking / Under Floor Metal Trunking

All cables/wiring inside solid bottom surface M.S Trunking / Under Floor Metal
Trunking shall be 3 core PVC insulated PVC sheathed, high temperature
resistant of specified grade and size, unless specifically shown on the drawing
or given in the BOQ having insulation of red colour for phase/line, black colour
for neutral and green or green-yellow colour for earth conductor.

4.5 Cable/ Wiring Inside Lighting Column

All cables/wiring inside lighting column from cable connection box to light
fixtures / lanterns shall be 3 core PVC insulated PVC sheathed, high
temperature resistant of specified grade and size, unless specifically shown on
the drawing or given in the BOQ having insulation of red colour for phase/line,
black colour for neutral and green or green-yellow colour for earth conductor.

4.6 Underground Cables

Cables for laying directly underground shall be PVC insulated, PVC sheathed
and armoured with galvanized steel/ aluminum wire. Cables fully installed in
underground ducts/pipes and mechanically protected from end to end shall be
PVC insulated and PVC sheathed unless specifically shown on the drawings or
given in BOQ.

4.7 Cable Markers

Above ground cable markers made of Grade-25 reinforced concrete shall be

erected at a maximum interval of 100 meters along the straight trench, at each
bend and joint box for indicating the presence of underground cables. Where the
trench changes its direction two number of markers shall be installed one in
each direction to indicate the two directions of the trench. At the joint box,
additionally a symbol shall be engraved just beneath the letters LV to indicate
the presence of the joint box. The cable markers shall be finished in grey paint.
The letters and symbols for indication shall be engraved in concrete on both
sides. Letters shall be LV for low voltage cable. The colour of the engraved
letters and symbol shall be red. The dimensions of the markers shall be as
shown on the drawing and shall be installed on the ground.

4.8 Cable Accessories

All cable accessories shall be provided for the complete cabling and wiring
system without any additional cost unless specifically mentioned in BOQ. These
shall include but not limited to the items such as saddles, clamps, fixing
channels, connectors, cable joints (where necessary and as approved by the
Engineer), clips, lugs, colour sleeves, identification tags, bushes, glands, etc. All
cable accessories should be standard products of reputable manufacturers.

Construction of Bridge at Korangi Causeway 8212-3 Low Tension Cables

5 INSTALLATION

5.1 General

All installation material, labour, tools, cable rollers and accessories for cable
installation shall be furnished by the Contractor. The cable and accessories shall
be installed as described in accordance with these Specifications, drawings and
manufacturer's instructions.

The Contractor shall confirm the exact cut lengths for cable by actual
measurements at site prior to the ordering. The cable lengths where shown on
the drawings or in BOQ are tentative and only for general guidance. The
Contractor shall be solely responsible for furnishing correct lengths of cable to
avoid joints in cable length except where necessary, after obtaining approval of
the Engineer.

No separate payment for such joints is admissible.

Necessary precautions for safety of cables shall be taken during the laying of
cables to avoid scratches/ cuts to the cable surface. Pulling force on cable at all
times shall remain well within the manufacturer’s recommended limits.

Prior to installation of jointing and termination kits, the cable lengths shall be
checked and tested to ensure that the cables are in sound condition, and no
damage has been done during handling and installation. After installation, these
shall again be tested prior to commissioning as per recommendations of the
standards according to which the cable is manufactured.

5.2 Conduit or Channel Wiring

The wiring through conduit shall be started only after the conduit and channel
system is completely installed and all outlet boxes, junction boxes, etc., are fixed
in position.

The wires shall be pulled in conduit or channel with care, preferably without the
use of any lubricant. Where necessary and if approved by the Engineer, the
cable manufacturer's recommended lubricant may be used. Where several wires
are to be installed in the same conduit, they shall be pulled together along with
the earth conductor. All wires of same circuit shall be run in one conduit.

The wires shall not be bent to a radius less than ten times the overall diameter
of the wire, or more if otherwise recommended by the manufacturer.

The wiring shall be continuous between terminations and looping-in system shall
be followed throughout. Any joint in wires shall not be allowed. The use of
connectors shall only be allowed at locations where looping-in is rendered
difficult. The consent of the Engineer shall be required for using connectors. The
connector shall be of suitable rating having porcelain body with sunk-in screw
terminals. The connector shall be wrapped with PVC insulation tape after its
installation. A minimum of 150 mm extra length of cable/wire shall be provided at
each termination to facilitate repairs in future.

5.3 Cables on Surface/Trenches/Trays/Ladders

All cables for installation on surface of wall, column, ceiling, trenches, trays etc.,
shall be fixed to the surface by means of galvanized steel clips secured to a
steel channel using suitable stud plate, nuts and washers. The distance between
each cable clip shall be such so as to support the entire weight of the cable and
that distance between the cable & surface and also the vertical clearance
between two adjacent cables at any point is 50mm minimum. Common
mounting channels are to be furnished for cable along the same route. The

Construction of Bridge at Korangi Causeway 8212-4 Low Tension Cables

 Contractor can offer alternate cable fixing arrangement, which shall be approved
by the Engineer before commencement of installation.

Cables shall be laid on cable trays/Cable ladders wherever marked and as

shown in the drawing. All cables shall be properly fixed with cable tray/ladders
by means of suitable saddles or other approved means. A minimum distance
between cables equal to the diameter of the cable shall be maintained between
cables.

5.4 Underground cables

The cables to be installed directly underground shall be laid in trenches in single

tiers. Unless shown specifically on the drawing the depth of cable below finished
ground level shall be 900 mm minimum measured from the top of the largest
cable to the general ground level. The burial depth may be increased as
required due to site conditions or when crossing other service pipes and roads.
Burial depth less than 900mm and more than 1500mm shall require Engineer's
approval.

When cables cross road, paved area, other services or other cables, they shall
be laid in protective pipes of required size as shown on the drawings. Cables
entering the buildings shall also be laid in protective pipes. The protective pipe
ends, after installation of cables, shall be plugged watertight be means of
bituminizedhessian or equivalent method as approved by the Engineer. A
minimum clearance of 250mm vertically and 500mm horizontally shall be
maintained between cables and other services.

The cable trench shall be excavated as per route and location shown on the
drawings. Before laying of cables in the trench, the bed of the trench shall be
leveled and filled with a 100mm thick layer of fine sand (as per specification
section 1100). The sand layer shall be leveled and the cables placed thereon.
The cables shall be covered with a layer of fine sand 100mm thick measured
above the top of the cable. Cable protective bricks shall be placed over the sand
cover which shall be of class-C cement concrete, minimum 50mm thick and
300mm (W) X 300mm (L) dimensions. Good quality bricks of proper strength
and shape, well-formed can also be used for the purpose of protection. The
bricks shall be placed over the sand layer and end-to-end to cover the entire
length and breadth of the cable trench. After the concrete bricks are placed, the
remainder of the trench shall be backfilled with earth in layer of loose thickness
of200mm. Each layer shall be thoroughly tamped and compacted. Backfill/ earth
fill shall be compacted to 95% for traffic / paved area and 90% for non-traffic
area of the maximum density of soil / sand when checked as per ASTM D 1557.

A PVC warning tape shall be provided 300 mm below normal ground level
covering the entire length and breadth of the trench. The warning tape shall be
yellow in colour with marking of danger and voltage of the cable printed in black
and as approved by the Engineer.

Cable identification tags of corrosion resistant material shall be tied to cables

with PVC cable tie at a maximum of 20 metersinterval along the cable length for
identification of cable and circuit. The earth continuity conductor shall be laid in
the trench with the cables.

Sufficient slack shall be left in cables for this purpose the cut lengths of cables
shall allow about 3% more in the measured lengths between terminations. At
underground joint box, ample slack shall be left to prevent straining of cable
joints due to settlement of earth. Payment shall be done as per actual lengths
measured at site after installation.

Construction of Bridge at Korangi Causeway 8212-5 Low Tension Cables

 The cut lengths of cables wherever stated are only as a guide. The Contractor
shall measure lengths between terminations of each circuit and if the
discrepancy between measured lengths at site and the one given on the drawing
differ, the Contractor shall report to Engineer and act as directed. Cables,
whether installed underground or in concrete trenches, shall not be bent to a
radius less than 12 times the diameter of the cable or as recommended by the
cable manufacturer, whichever is higher.

If existing services / culverts / drain etc. are present, LV Cables shall be laid
using thrust boring or the support as approved by the Engineer. No payment
shall be made and its cost is deemed to be included in the item else wherein
BOQ.

5.5 Cable Marker

Above ground, cable markers shall be erected at a100 meter interval along the
straight trench, and at each bend and joint box for indication of presence of
underground cable. For more than 3 feet wide trenches, cable markers shall be
provided at both edges of the trench. The cable marker shall bear the necessary
instructions indicated in approved colours.
The Contractor shall submit to the Engineer for approval, schedule of cable
markers showing location of marker and instructions on each marker.

6 MEASUREMENT AND PAYMENT

6.1 General

The Contractor's bid amount against each Bill of Quantities item as given below
shall include supply, installation, testing, commissioning and completion for all
work specified herein and/or as shown on the Drawing related to the item.

6.2 Light Circuit Wiring inside Street light Pole

6.2.1 Measurement

Measurement shall be made for the total number of light circuit wiring
from connections box to light fixture through hollow of the column,
including all accessories carried out by the Contractor as a complete
unit.

6.2.2 Payment

Payment shall be made for the total number of units measured, as

provided above, at the Contract unit price each and shall constitute full
compensation for supplying, installing, connecting, testing,
commissioning and completion of the circuit wiring from connections box
to light fixture with required number of specified size multi core PVC
insulated cable, earth continuity conductor complete with all accessories
complete in all respects.

6.3 LT Cables

6.3.1 Measurement

Measurement shall be made for the total running meter for each size
and type of LTacceptably supplied and installed by the Contractor. If
existing services / culverts / drain etc. are present, LV Cables shall be
laid using thrust boring or the support as approved by the Engineer. No
payment shall be made and its cost is deemed to be included in the item
else wherein BOQ.

Construction of Bridge at Korangi Causeway 8212-6 Low Tension Cables

 6.3.2 Payment

Payment shall be made for the total running meter of each size and type
of LT cable measured, as provided above, at the Contract unit price
each and shall constitute full compensation for supplying, installing,
connecting, testing and commissioning of the LT including all
accessories such as cable joints, lugs, color sleeves, glands, bush, etc.
complete with plugging of protective pipe/ sleeve ends for water
tightening. If existing services / culverts / drain etc. are present, LV
Cables shall be laid using thrust boring or the support as approved by
the Engineer. No payment shall be made and its cost is deemed to be
included in the item else wherein BOQ.

6.4 Excavation / Backfilling

6.4.1 Measurement

Measurement shall be made for the total cubic meter of excavation /

backfilling of trenches acceptably completed by the contractor according
to the specification and as shown on drawings.

6.4.2 Payment

Payment shall be made for the total cubic meter of excavation /

backfilling of cable trench measured as carried out above at the contract
unit price and shall constitute full completion for excavation / backfilling
and all the works related to the item.

No separate payment shall be made for the under mentioned specified

work related to the B.O.Q. item excavation and backfilling. The cost
thereof shall be deemed to have been included in the quoted rates of
above work.

- Dewatering during excavation and backfilling.

- Providing and filling of fine sand in trenches.
- Compacted backfilling of trenches with specified material and
disposal of surplus and rejected material.
- Providing and laying of 300mm x 300mm x 50mm thick concrete
(gade-20) protective tiles in trenches.
- Providing and laying of PVC warning tape.
6.5 Cable Marker

6.5.1 Measurement:

Measurement shall be made for the total number of cable marker

acceptably supplied and installed by the Contractor as a complete unit.

6.5.2 Payment:

Payment shall be made for the total number of cable marker as provided
above at the contract unit price and shall constitute full compensation for
supplying & installing reinforced concrete cable markers, excavation,
backfilling, concrete curing, and painting etc.

***** End of Section – 8212 *****

Construction of Bridge at Korangi Causeway 8212-7 Low Tension Cables

 SECTION - 8230

CONDUITS AND PIPES

1. SCOPE OF WORK

The work under this section consists of supplying, installing and commissioning of all
material and services of the complete Conduits and Pipes as specified herein and/or
shown on Tender Drawings and stated in the Bill of Quantities.

The Contractor shall discuss the electrical layout with the Engineer and co-ordinate at
Site with other services for exact route, location and position of the conduits and pipes.

The conduits and pipes with accessories shall also comply with the General
Specifications for Electrical Works, Section-8001 and with other relevant provisions of
the Tender Document.

2. GENERAL

The extent of works shown on the drawing does not indicate the exact position of
conduits and pipes. The Contractor shall ensure exact location and route of conduit and
pipes in coordination with other services drawings and actual equipment layout plan as
per site requirements and as directed by the Engineer.

The conduit system shall be continuous with manufacturer’s recommended accessories.

The quality and material for the accessories of conduits and pipes such as sockets, end
cap, elbows, bushings, bends, inspection/pull boxes, round boxes, etc., necessary for
the complete installation shall be similar to that of conduits or pipes. All the accessories
shall be supplied by the Contractor without any extra cost and deemed to have been
included in the price of conduits/pipes.

Pull wire shall be laid in all empty conduits.

Appropriate size flexible conduits and pipes shall be used at expansion joints of the
buildings and structures.

Normal and emergency circuits shall run in separate conduits.

3. APPLICABLE STANDARD/CODES

The latest edition of the following standards and codes shall be applicable for the
materials specified within the scope of this section:

BS 61386 - Conduit Systems for Cable Management.

BS 6099 - Conduit for Electrical Installation
BS 4607 - Non-mettalic conduits and fittings for electrical
Installations.

BS EN ISO - Plastics piping systems for water supply and for buried & above
1452-1:2009 – ground drainage and sewerage under pressure. Unplasticized
poly(vinyl chloride) UPVC. General

BS EN 10255 - Non-alloy steel tubes for welding & threading. Technical delivery
conditions

Construction of Bridge at Korangi Causeway 8230-1 Conduits and Pipes

 BS 3505 - Specification for Unplasticized Polyvinyl Chloride (PVC-U)
Pressure Pipes for Cold Potable Water

PS 3051 - Specification for Unplasticized Polyvinyl Chloride (PVC-U)

Pressure Pipes for Cold Potable Water

4. MATERIAL

4.1 Galvanized Iron (G.I.) Conduits and Accessories

G.I. conduits shall be used on surface for lighting and power circuits wherever
specified and required, as shown on drawings or given in BOQ.

The G.I. conduits shall be made of medium gauge mild steel, galvanized inside
and outside by hot dip galvanized process. The conduit shall be free from stains,
burrs or any other defects. The accessories for G.I. conduit such as sockets,
bends etc. shall also be galvanized inside and outside and of the same quality
and specification as the conduit. Each length of conduit shall be furnished with
threaded ends.

The round junction boxes for ceiling light points shall have minimum dimensions
of 64mm diameter and 64mm depth. The junction boxes for wall light points shall
have minimum dimensions of 64mm diameter and 40mm deep. Round junction
boxes shall be provided with one piece cover plate fixed to the box by means of
brass screws. All junction boxes and other accessories shall also be hot dip
galvanized to ensure protection against corrosion.

4.2 PVC Conduits and Accessories

The PVC conduits and accessories for lighting and power circuits shall be
furnished by the Contractor as shown on the drawings or given in BOQ. The
PVC bends shall have enlarged ends to receive conduit without any reduction in
the internal diameter at joint. Manufactured smooth bends shall be used where
conduit changes direction. Bending of conduits by heating or otherwise will be
allowed in special situations only for which the consent of the Engineer shall be
required. The use of sharp 90 degree bends and tees will not be allowed for
concealed wiring.

The round PVC junction boxes for ceiling light or fan points shall have minimum
dimensions of 63 mm diameter and depth. The junction boxes for wall light
points shall have minimum dimensions of 63 mm diameter and 38 mm deep.
Round junction boxes shall be provided with one piece PVC cover plate fixed to
the box by means of brass screws.

4.3 Inspection/Pull and Adaptable Boxes

Inspection/Pull boxes and adaptable boxes shall be provided in GI / PVC/ uPVC

conduit runs wherever required to facilitate pulling operation and/or change in
directions of conduit installation.

The drawings are diagrammatic and do not indicate the position and spacing of
inspection/pull boxes or adaptable boxes. However, these shall be as per
Engineer's approval.

4.3.1 Inspection/Pull Boxes

The rectangular inspection/pull boxes shall be made of 16 SWG heavy

Construction of Bridge at Korangi Causeway 8230-2 Conduits and Pipes

 gauge hot dipped galvanized iron with anticorrosive coating of suitable
design to receive conduits. The box shall be painted inside and outside
with black enamel paint over a base coat of red oxide primer paint. The
minimum length of the box shall not be less than four times the cable
manufacturer recommended bending radius of the cable.

All surface type boxes shall have cover of same gauge sheet steel of
appropriate size. The covers shall be fixed to the box by means of
counter sunk galvanized screws.

4.3.2 Adaptable Boxes

Adaptable boxes shall also be made of 16 SWG sheet steel and painted
and finished to the same quality as the Lighting distribution boards.

4.4 uPVC Pipes and fittings

Un-plasticized PVC pressure pipes and fittings shall conform to BS 3505 and
PS 3051 and shall be of Class D(working pressure - 12 bars) and class-B
(working pressure - 6 bars). The buried uPVC pipes should be able to withstand
the external load acting upon it by continuous movements of heavy duty vehicles
such as trucks, cranes, forklift etc. where pipe changes direction; manufacturer
smooth bend shall be used.

Fittings and accessories for use with uPVC pressure pipes shall be of the same
class and manufacture as the pipe and shall have the required shapes and
dimensions of turned ends to fit the uPVC pressure pipes. uPVC pipes and
accessories shall be suitable for jointing with rubber rings or solvent.

Bending of pipes by heating or otherwise will not be allowed. The use of sharp
90 degree bends and tees will not be allowed. The bends shall conform to same
specifications as given for PVC conduits. For joining of pipe all precautions and
procedures recommended by manufacturer shall be allowed.

Hard PVC pipe range spacers with locking arrangements shall be used if there is
more than one pipe running in parallel. The distance between range spacers
shall not be more than 2 meters. Range spacers shall be prefabricated/precast
and decay resistant.

Flexible pipes shall be used as deemed essential or as approved by the

Engineer.

4.5 Pipe End Marker

Wherever the underground pipe ends do not terminate into any airfield light
fixture, transformer housing or a concrete pit, pipe end markers shall be installed
to indicate the location of the pipe ends underground. The pipe end markers
shall be a concrete slab marker in the vicinity of Runway, Taxiway and Apron.
The size, thickness and concrete grade of the flat pipe end markers shall be as
shown on the drawing. Each marker shall have following information impressed
upon its top surface.

a) The word ‘PIPE’

b) Number of layers X number of pipes in each layer (diameter of pipes)

Construction of Bridge at Korangi Causeway 8230-3 Conduits and Pipes

5. INSTALLATION

5.1 Galvanized Iron (G.I) Conduits and Accessories

The G.I. conduits on surface shall be installed where shown on drawings/

mentioned in BOQ. The conduits shall be installed parallel or perpendicular to
the surface of walls, structural members, ceiling, etc., by means of C.I. saddles
and clamps of approved design. The conduits shall be kept at least 150 mm
away from any other services pipes.

The saddles shall be installed on surface by means of nylon or wooden plugs

and galvanized screws. Appropriate size of holes in structure shall be made by
drilling, the thickness of saddles shall not be less than 6mm and clamps shall be
of 16 SWG G.I. The surface conduits shall be supported at a maximum of one
meter spacing along horizontal and vertical runs. All accessories for complete
installation of conduit system shall be provided by the Contractor. The pull boxes
etc. if required shall be used for surface conduit system. The entire conduit
system alongwith the accessories shall be galvanized.

5.2 PVC Conduits and Accessories

5.2.1 Concealed PVC Conduit

Where concealed PVC conduit system is shown on drawings/ mentioned

in BOQ, the conduit shall be installed concealed in roof, wall, column,
etc. Conduits shall be laid under floor only where specifically stated. The
entire conduit system shall be installed and checked before wiring is
carried out. Any obstruction found shall be cleared before the installation
of cable.
When concealed, the conduit shall have a minimum of 32mm cover of
concrete measured from the top of conduit to finished surface. In the
reinforced cement concrete (RCC) work the conduit shall be laid before
pouring of concrete. Under no circumstances shall chases be made in
the RCC structure for concealing conduit and accessories after pouring
of concrete. The conduit shall be supported on top of bottom
reinforcement of slab. All outlet boxes to be firmly supported and
installed such that they finish flush with the soffit of slab or beam.
Where conduits have to be concealed in cement concrete (CC) work
after concreting or in block masonry, chase shall be made with
appropriate tools and shall not be made deeper than required. The
conduit shall then be fixed firmly in the recess and covered with cement
concrete mixture. The work of cutting in the cement concrete work or
block masonry work shall be coordinated with the civil work. The
Contractor shall obtain approval from the Engineer before starting
chasing and cutting.
The termination of conduits at or near the equipment / switchboard is
shown diagrammatically on the drawings. The exact locations of the
termination shall be coordinated with the equipment/ switchboard to be
installed. Any extension of conduit to suit the site condition shall be
made without any extra cost. Conduit ends pointing upwards or
downwards shall be properly plugged in order to present the entry of
foreign materials. All openings through which concrete may leak shall be
carefully plugged in order to prevent the entry of foreign materials. All
opening through which concrete may leak shall be carefully plugged and
boxes shall be suitably protected against filling with concrete. At all
terminations of conduit, sharp edges of conduit ends shall be prevented

Construction of Bridge at Korangi Causeway 8230-4 Conduits and Pipes

 to avoid the cutting or damaging of wires or cables during pulling
through the conduits.
Under floor conduit shall be installed at a minimum depth of 50 mm from
the finished floor level or as shown on the drawings. The conduits shall
be installed empty, before finishing of floor or in RCC work, with an 18
SWG steel wire drawn through the conduit for pulling cable. No conduits
shall be laid under floor in bathroom.

5.2.2 Surface PVC Conduits

The surface PVC conduits shall be installed where shown on drawings /

mentioned in BOQ. The conduits shall be installed parallel or
perpendicular to the surface of walls, structural members, ceiling, etc.,
by means of PVC saddles and clamps of approved design. The conduits
shall be kept at least 150 mm away from parallel runs of flues, steam
pipes and hot water pipes.

The saddles shall be installed on surface by means of nylon or wooden

plugs and galvanized screws. Appropriate size of holes in structure shall
made by drilling, the thickness of saddles and clamps shall be at
appropriate thickness and prime quality.

The surface conduits shall be supported at maximum of 1000mm

spacing along horizontal and vertical runs. The Contractor shall provide
all accessories for complete installing of conduit system. The pull boxes,
etc. as stated for concealed conduits shall also be applicable for surface
conduit system.

5.3 Inspection / Pull and Adaptable Box

Inspection/Pull boxes and adaptable boxes shall be provided in conduit runs

wherever required to facilitate pulling operation, and/or change in directions of
conduit installation.

Inspection/Pull Boxes

The inspection/pull boxes shall be installed inside the edge barrier /new jersey
barrier under each street lighting column for facilitating the bending &
termination of incoming and outgoing cables in the connection block in the
street lighting column.

The covers shall be fixed to the box by means of counter sunk galvanized
screws.

Adaptable Boxes

The adaptable box shall preferably be fixed adjacent to the DB and have
suitable dimensions to match the installation with DB. However, in any case,
the depth of adaptable box shall be according to number & size of cables &
conduits and shall not be less than the following:

- Conduits upto 25 mm dia. : Min. depth = 50mm

- Conduits upto 32 mm dia. : Min. depth = 65mm
- Conduits upto 50 mm dia. : Min. depth = 90mm
- Conduits more than 50 mm dia. : Min. depth = 2x dia.

Construction of Bridge at Korangi Causeway 8230-5 Conduits and Pipes

 5.4 uPVC Pipes and Fittings

uPVC pipes shall be installed as shown on the drawings. The depth of the pipe
shall vary according to the conditions at site, and approval of Engineer shall be
obtained prior to installation. In general the pipes shall be installed underground
at the following depths measured from the top of the pipe.

- Under roads/pavements : 900 mm below finished surface.

- Under drain / culvert : 1000 mm below bottom slab.
- When crossing other services : 250/500 mm vertical/horizontal.

The trench of required dimensions shall be excavated and the bottom of trench
cleaned and leveled. A 100 mm bed of fine sand shall be provided over which
the PVC pipes installed after proper alignment. Where two or more pipes are
installed in the same trench the clearance between pipes shall not be less than
50 mm. This shall be done by the provision of pipe range spacers as shown in
the drawings & as per Engineers approval. After laying of pipe the trench shall
be backfilled with clean screened sand at least 100 mm above the top most
pipes. The remaining portion of trench shall be backfilled with selected earth in
layers well compacted. Warning tape shall be laid all along the pipe trench at a
depth of 300 mm from finished ground level.

After installation, the ends of the pipe shall be plugged with manufactured end
cap impervious to water and chemicals. All joints shall be sealed adequately not
only to prevent entry of foreign elements but water tightness shall be ensured as
well.

The installation of pipes shall be completed in all respects including its fixing at
terminations, before cabling work is started. All sharp edges and burrs shall be
removed by using reamer or any approved device. The pipe shall be through
cleaned of dirt and dust from inside whereas the pipes shall be installed in
proper co-ordination with other works.

The protective PVC pipe for cable entering building shall be installed so as to
lead cable into the cable trench. The required number of pipes shall be fixed
before completing the work in the plinth. If an opening is provided to the cable
trench or electrical pit from outside, the required number of pipes shall be
installed and part of the opening remained unutilized and annular space after
laying of cable shall be properly packed and sealed using polyurethane sealant
which should be impervious to water and chemical to make it completely water-
tight.

Empty/Spare pipes shall be provided with 5 mm dia rope pulled from end to end
and plugged with manufactured end cap.

Flexible pipes of compatible material and size shall be used wherever deemed
essential.

5.5 Pipe End Markers

The pipe end markers shall be installed flat in the ground with top approximately
2.5 cm. above the finished grade. After the concrete marker has set a minimum
of 24 hours, the top surface shall be painted bright orange with paint suitable for
uncured exterior concrete.

Markers shall be installed after the laying of cables through the pipes is
completed in all respects and cable trenches are finally covered and compacted.

Construction of Bridge at Korangi Causeway 8230-6 Conduits and Pipes

6. MEASUREMENT AND PAYMENT

6.1 General

The Contractors bid amount against each item of Bill of Quantities as given
below shall include supply, installation, testing, commissioning and completion
for all work specified herein and/or as shown on the Tender Drawings related to
the item.

6.2 uPVC Pipes and Accessories

6.2.1 Measurement:

Measurement shall be made for the total running meter of each type and
size of pipes and accessories acceptably supplied and installed by the
Contractor according to specification and as shown on drawings.

6.2.2 Payment:

Payment shall be made for the total running meter of each type and size
of pipes measured as provided above at the contract unit price each and
shall constitute full compensation for supplying, installing and completion
of the laying of the pipes including all accessories related to the item.

No separate payments shall be made for the under mentioned specified

work related to the supply and installation of pipe. The cost thereof shall
be deemed to have been included in the quoted rates of above work.

− Excavation and backfilling.

− Dewatering during excavation and backfilling.

− Providing and filling of fine sand in trenches.

− Providing pipe range spacers.

− Providing flexible pipes and accessories, jointing material/

compound, saddles, sockets, elbows, bend, junction boxes, pull
box ,reducers, 5 mm dia. rope for empty pipe, soft metal bush,
making threads and plugging of pipe with manufactured end cap
etc. whether used or left spare.

− Compacted backfilling of trenches with specified material and

disposal of surplus and rejected material.

− Watertight/fire and heat resistant polyurethane sealants for

sealing all unutilized opening/pipes after laying of cables.

6.3 Conduits (G.I. and PVC) and Accessories

6.3.1 Measurement:

Measurement shall be made for the total running meter of each type and
size of conduits and accessories acceptably supplied and installed by
the Contractor according to specification and as shown on drawings.

Construction of Bridge at Korangi Causeway 8230-7 Conduits and Pipes

 6.3.2 Payment:

Payment shall be made for the total running meter of each type and size
of conduits measured as provided above at the contract unit price each
and shall constitute full compensation for supplying, installing and
completion of the laying of the conduits including all accessories related
to the item.

No separate payments shall be made for the under mentioned specified

work related to the supply and installation of undermentioned items.

− Providing flexible pipes and accessories, jointing material/

compound, saddles, sockets, elbows, bend, junction boxes, pull
box ,reducers, 16SWG GI pull wire for empty conduit, and 5 mm
dia. rope for empty pipe, soft metal bush, making threads and
plugging of pipe with manufactured end cap etc. whether used
or left spare.

The cost thereof shall be deemed to have been included in the quoted
rates of above work.

6.4 Pipe End Markers

6.4.1 Measurement

Measurement shall be made for the total number of markers acceptably

supplied and installed by the contractor as a complete unit.

6.4.2 Payment

Payment shall be made for the total number of units measured, as

provided above, at the contract unit price and shall constitute full
payment compensation for supplying, installing, reinforced concrete pipe
end markers, excavation, backfilling concrete curing and painting etc.

***** End of Section – 8230 *****

Construction of Bridge at Korangi Causeway 8230-8 Conduits and Pipes

 SECTION - 8240

EARTHING / GROUNDING SYSTEM

1. SCOPE OF WORK

The work under this section consists of supplying, installing, testing and commissioning
of all material and services of the complete Earthing system as specified herein, as
shown on the Tender Drawings and given in the Bill of Quantities.

The Contractor shall discuss the electrical layout with the Engineer and co-ordinate at
Site with other services for exact route, location and position of the earth electrode,
counterpoise conductor and ECC etc.

The Earthing/ Grounding system shall also comply with the General Specifications for
Electrical Works Section - 8001 and with other relevant provisions of the Tender
Documents.

2. GENERAL

The earthing/ Grounding system consists of earth electrodes, earthing leads, earth
connecting points, earth continuity conductors, counter poise conductor, equipment
ground lead and all accessories necessary for the satisfactory operation of the
associated electrical system.

A dedicated earthing grid shall be installed underground in the vicinity of the

buildings/structures as shown on the drawings. All mechanical and electrical systems
shall be solidly connected to this earthing grid. The earthing grid shall be of bare tinned
copper conductor strip laid at the same depth as that of the earth pits connected to it.
The main distribution, connection pit, earth connecting point etc. and the lightning
protection system must be integrated to assure an extensive integrated ground-grid.

The electrical contractor has to supervise the installation in order to guarantee the proper
execution of the works ensuring overall earthing resistance within permissible limits of
applicable standards.

3. APPLICABLE STANDARDS/CODES

The latest editions of following standards / codes shall be applicable for the materials
specified within the scope of this section:

BS 7430 - Code of practice for protective earthing of electrical installations

BS 951 - Electrical earthing - Clamps for earthing and bonding
Specifications

BS EN 12163 - Copper and Copper Alloys –Rods for general purposes

BS EN 50522 - Earthing of power installations exceeding 1 kV a.c

IEEE Std.80 - IEEE Guide for Safety in AC Substation Grounding

BS EN 13601 - Copper and Copper Alloys - Copper rod, bar and wire for
General electrical purposes

BS EN 13602 - Copper and Copper Alloys - Drawn round, copper wire for the
Manufacture of electrical conductors

Construction of Bridge at Korangi Causeway 8240-1 Earthing/ Grounding System

 BS EN 60228 - Conductors of insulated cables

BS 6346 - PVC insulated cables

BS EN 12164 - Copper and Copper Alloys – Rod for free machining purposes

BS EN 12167 - Copper and Copper Alloys – Profiles and bars for general
Purposes

BS 6004 - Electric cables, PVC insulated, non-armoured cables for

voltages upto& including 450/750Volts for electric power,
lighting & internal wiring

BS EN 62561-5 - Lightning protection system components (LPSC). Requirements

for earth electrode inspection housings and earth electrode
seals

4. MATERIAL

4.1 Earth Electrodes

4.1.1 Plate Type

The plate type earth electrode shall comprise a 600 x 600 x 3mm 99.9%
pure high conductivity electrolytic copper plate. The surface of the plate
shall be tinned for protection. The plate shall have four terminals for
connecting the earthing leads. Nuts bolts and washers shall be either of
brass or tinned copper. A 50mm dia. G.I. pipe shall be provided from
inspection chamber to earth plate for watering purpose. This pipe shall
have 10mm dia. holes at 500mm center to center all along the length.

At the ground level a medium / heavy weight concrete inspection

chamber with cast iron cover shall be constructed having dimensions as
shown on the drawings. The inspection chamber shall have a cover
supported on angle iron frame. The cover shall be hinged type, as
approved by the Engineer and shall finish flush with the ground level.

4.1.2 Copper Clad Steel Rod Type

This type of earth electrode shall comprise a 3 meter long, 19 mm dia.

copper clad steel rod having flat head at drive end and pointed conical
tip at the driven end. The tip shall be hardened to facilitate driving. At
the top of the rod, a brass clamp for bolted connections shall be
provided suitable for connection to the down conductor or earthing lead
as required.

The inspection chamber with heavy/ medium duty C.I. cover shall be
provided as instructed by the Engineer.

4.2 Earthing Leads

The earthing leads shall connect the earth electrode to earth connecting point
(ECP) inside the inspection chamber unless required otherwise. It shall be of
stranded electrolytic copper. It can be bare tinned copper or PVC insulated
(green or green/yellow) of sizes shown on the drawings. The cost of earthing
leads deemed to have been included in the price of earth electrode and no
separate payment shall be made for it.

Construction of Bridge at Korangi Causeway 8240-2 Earthing/ Grounding System

 4.3 Earth Continuity Conductors

Earth continuity conductors (ECC) shall be stranded bare tinned copper

conductor or single core PVC insulated, copper conductor cable of sizes
indicated on the drawings. All thimbles, lugs, sockets, nuts, washers & other
accessories necessary for the complete installation of ECC shall be provided by
the Contractor without any extra cost.

The specifications for single core PVC insulated cables used as ECC shall be
same as those given in section "LT Cables" of the technical specifications. PVC
insulated cables when used as ECC shall be green or green/yellow.

4.4 Earth Connecting Points (ECPs)

Earth connecting points shall comprise tinned copper bar, rectangular in shape,
having dimensions of at least 50 x 6 mm and 300 mm long. At least six terminals
for connection shall be arranged on the bar, which can be increased or
decreased as required by the Engineer. The length of earth connecting points
shall be suitably increased, if more than six earth wires are required to be
terminated on the same ECP.

The terminals shall have brass or tinned copper bolts, nuts and washers for
protection against corrosion. Two holes shall be provided off center of the
copper bar for fixing to the wall by means of 10 mm dia. nut and bolt and shall
be insulated by means of rubber gaskets/washers, porcelain insulators, etc.

5. INSTALLATION

5.1 General

Complete earthing/ grounding systems as shown on the drawing shall be

installed by the Contractor. The earthing system shall give earth resistance,
including the resistance of soil, earth leads and ECC equal to or less than one
ohm.

At all connections of earth continuity conductors to LT Switch Boards, LT

Distribution Boards, poles or any other metallic body, proper size copper or
brass sockets, thimbles or lugs shall be used to which the copper wire shall be
connected by copper brazing. The soldering of copper wire at joints or
terminations shall not be allowed. All tee-off connections shall be by copper
brazing using suitable socket and clamps. After brazing, the jointed surface shall
be protected by oxide inhibiting compound of low electrical resistance. For
connections to metallic body, the surface shall be thoroughly cleaned before
bolting the lug or socket.

Lead sheaths or steel tape armours are not permitted as grounding conductors.
At any joint or terminations, the ECC shall be connected using proper
accessories. No connection shall be made by twisting of earth conductors.

The earthing system shall be designed and installed to ensure that when any
part of the earthing system is disconnected for the purpose of carrying out
periodic testing an alternative path to earth is available.

The earth continuity conductor shall in general run in cable trench or in

conduits/pipes as shown on the drawings. For under floor runs, these shall be
installed in pipe/conduit of appropriate sizes. Where laid along underground
cables, these shall be laid directly underground in unpaved areas and in pipes
under paved areas.

Construction of Bridge at Korangi Causeway 8240-3 Earthing/ Grounding System

 The earthing system shall be tested after complete installation of earth
electrodes.

5.2 Earth Electrodes

5.2.1 Plate Type

The electrode plate shall be installed at a minimum depth of 16.5 feet

(5meters)from finished ground level or 4 inches (100mm) below
permanent water level whichever is less. The minimum horizontal
distance between earth electrodes shall be 10 feet (3metres). Proper
mixture of lime and charcoal shall be made and buried alongwith the
copper plate in the ground to increase the soil conductivity. The
electrode shall be installed as per details shown on the drawings. The
inspection chambers shall be constructed at locations approved by the
Engineer. Suitable treatment on covers to protect against harsh
atmospheric conditions shall be made as per instruction of Engineer.

5.2.2 Copper Clad Steel Rod Type

In case the soil conditions at site is permitted and approved by the

Engineer, this type of earth electrode may be installed by hammering
the electrode in soil, until the top of the rod is about 12 inches (300 mm)
below the proposed finished ground level. If hammering down of rod is
not possible due to site conditions, a pit shall be first excavated in bare
ground up to the required depth and electrode shall be installed upright
in the pit. The excavated pit shall be backfilled in layers of 20 inches
(500 mm), each layer tamped and compacted. The inspection chambers
shall be constructed at locations approved by the Engineer. Suitable
treatment on covers to protect against harsh atmospheric conditions
shall be made as per instruction of Engineer.

5.3 Earth Continuity Conductors(ECCs)

The earth continuity conductors of sizes shown on the drawings shall be

installed all along the cable runs and connected to the earthing bar/terminals
provided in equipment. The bodies of equipment and all switchboards shall also
be connected to earth by specified size of ECC. All other metal work shall also
be connected to earth by specified size of ECC. Appropriate size and numbers
clamp/saddles shall be utilized to ensure smooth and safe installation of all type
of ECCs.

At any joint or terminations, the ECC shall be connected using proper

accessories. No connection shall be made by twisting of earth conductors.

5.4 Earth Connecting Points

The earth connecting points shall be installed at locations shown on the

drawings. These shall be fixed on wall surface by means of brass screws with
nuts, washers, porcelain insulators and other insulating material as instructed by
the Engineer.

6. MEASUREMENT AND PAYMENT

6.1 General

The Contractor's bid amount against each Bill of Quantities item as given below
shall include supplying, installation, testing, and commissioning of all work
specified herein, as shown on the Tender drawing related to the item.

Construction of Bridge at Korangi Causeway 8240-4 Earthing/ Grounding System

 6.2 Earth Electrode

6.2.1 Measurement:

Measurement shall be made for the total no. of each type of earth
electrode acceptably supplied and installed by the Contractor as a
complete unit.

6.2.2 Payment:

Payment shall be made for the number of units measured, as provided

above, at the Contract unit price each, and shall constitute full
compensation for supplying, installing, testing, commissioning and
completion of earth electrodes including copper plate or copper clad
steel rod, earthing lead, excavation, backfilling, Ground enhancing
material, inspection chamber with cast iron cover, GI pipes for earthing
leads/watering, nuts, bolts, washers, lugs, brazing and all related civil
works, complete with suitable treatment of cover.

6.3 Earth Continuity Conductor (ECC)/ Earthing Leads

6.3.1 Measurement:

Measurement shall be made for the total running feet of each size and
type of earth continuity conductor (ECC) / Earthing Leads acceptably
supplied and installed by the Contractor.

6.3.2 Payment:

Payment shall be made for the total running feet of each size and type
of ECC/ Earthing Leads measured, as provided above, at the Contract
unit price and shall constitute full compensation for supplying, installing,
connecting, testing and completing of ECC/ Earthing Leads/
Counterpoise Conductor/ Equipment Ground Lead including all
accessories such as sockets, clamps/saddles, thimbles, lugs, bolts,
nuts, washers, brazing, etc.

6.4 Earth Connecting Point

6.4.1 Measurement:

Measurement shall be made for the total no. of earth connecting points
acceptably supplied and installed by the Contractor as a complete unit.

6.4.2 Payment:

Payment shall be made for the total number of units measured, as

provided above, at the Contract unit price each and shall constitute full
compensation for supplying, installing and completion of earth
connecting point and all other associated accessories such as nuts,
bolts, washers, lugs, etc.

***** End of Section – 8240 *****

Construction of Bridge at Korangi Causeway 8240-5 Earthing/ Grounding System

 SECTION - 8290

MISCELLANEOUS ITEMS

1. SCOPE OF WORK

The work under this section consists of supplying, installing, testing and commissioning
of all material and accessories for Miscellaneous Items as specified herein and/or shown
on the drawings and given in the Bill of Quantities.

The Contractor shall discuss the electrical layout with the Engineer and coordinate at site
with all other services for exact locations, installation height and positions of the
Miscellaneous Items.

The Miscellaneous Items with accessories shall also comply with the General
Specifications for Electrical Works Section - 8001 and with other relevant provisions of
the Contract Document.

2. GENERAL

The Miscellaneous Items as described in this section shall comply with other sections of
these specifications as applicable. The Contractor shall ensure that all the miscellaneous
items be supplied/fabricated from the reputable manufacturers, who have already
supplied/fabricated similar items.

Effectiveness of duration of warranty from Original Equipment Manufacturer (OEM) shall

commence from the effective date of Taking Over Certificate issued by the Engineer. All
warranties are to be endorsed in the name of the Employer and an undertaking shall be
submitted from Original Equipment Manufacturer (OEM) and local representatives for
ensuring compliance of services to the Employer during Warranty Period. The cost
incurred for such warranty shall deem to have been included in the item rate of relevant
BOQ item. Additional payment, whatsoever, shall not be admissible in this regard and
for extended warranty, if any

3. APPLICABLE STANDARDS/CODES

The latest editions of the following standards/codes shall be applicable to the material
specified within the scope of this section:

IEC 60947-3 - Low Voltage Switch Gear and Control Gear -

Switches, disconnectors, switch-disconnectors and
fuse-combination units
BS EN ISO 1461 - Hot dip galvanized coatings on fabricated iron and steel
articles. Specifications and test methods.

BS EN 15630 - Safety requirements for electric fans and regulators.

BS EN 50085 - Cable trunking and cable ducting systems for electrical
installations.
BS EN 61537 - Cable management. Cable tray systems and cable
ladder systems

BS 4678-2 - Specification for Cable Trunking - Part 2:

Steel Underfloor (Duct) Trunking

BS EN 10346 - Continuously hot-dip coated steel flat products for

Cold forming — Technical delivery conditions

IEC 61084-2-2 - Cable trunking systems and cable ducting systems for

Construction of Bridge at Korangi Causeway 8290-1 Miscellaneous Items

 electrical installations - Part 2-2: Particular requirements

BS EN 60335-2-80 - Household and similar electrical appliances. Safety.

Particular requirements for fans.
BS EN-124 - Gully tops and manhole tops for vehicular and
pedestrian areas - Definitions, classification, general
principles of design, performance requirements and test
methods
ISO-12944-2 - Corrosion Protection of Steel Structures by Protective
Paint Systems
BS 5733 - Specification for general requirements for electrical
accessories.

IEC 60884-1 - Plugs & socket-outlets for household & similar purposes

CEE 7 - standard AC plugs and sockets

BS EN 60529 - Degrees of protection provided by enclosures (IP Code)

4. MATERIAL

4.1. Hot dipped galvanized M.S. Cable Trays / Trunking / Ladders with protective
paint system

The hot dipped galvanized M.S. cable tray / trunking (with cover) shall be 14
SWG M.S. sheets. Suitable trunking design shall be provided for bends,
crossings, etc., keeping in view allowable bending radius of cables.

After cutting/perforation and fabrication of each tray / trunking and cover section,
the metalwork shall be galvanized and coated as specified in 4.4.1.

Arrangement shall be provided to secure the cables in position on the trunking.

Cables laid on tray / trunking shall be properly fixed or clamped, with smooth
finished split pieces with bore diameter to suit the cable. Supports shall be
arranged as far as practicable for easy removal of any cable without disturbing
other cables.

Copper braid connections shall be provided at every joint, fixing accessories of

cable tray to ensure continuity.

Cable trays shall be earthed with flexible copper braid/ strip.

Where specified, the cables shall run on cable trays/trunking supported to the
wall and/or ceiling. The tray shall be of appropriate dimensions to ensure
minimum clearance of one dia spacing between the cables. Tray and trunking
shall be provided with complete accessories such as straight through joint,
flexible expansion coupler, tee, cross, internal and external bend, cover etc.
complete with proper support and fixing accessories, GI nuts, bolts washer etc.

The cable tray/ trunking length shall be fabricated in sections not exceeding 3
meters.

The arrangements shall be provided for manufactured bends, crossing,

connection piece etc. keeping in view the allowable bending radii of the cables.
The design of such trays shall include a factor of safety to guard against
permanent distortion when supporting the load of the erection staff during cable
installation. Arrangement shall be provided to secure the cable in position on the
trays. At every building expansion joint flexible expansion couplers shall be

Construction of Bridge at Korangi Causeway 8290-2 Miscellaneous Items

 provided, All auxiliary material not particularly specified but necessary for proper
execution shall be coated as the cable tray/ trunking/ ladder and shall be
included in the offer.

4.1.1 Protective paint system

All indoor cable trays/ trunking/ ladders shall be coated with protective
paint system in accordance with ISO 12944 Corrosivity Category “C3”
with Medium Durability. The Priming coat(s) shall be Epoxy based and
top coat shall be polyurethane based with color shade not other than
RAL 7032 or 7035.

All outdoor cable trays/ trunking/ ladders shall be coated with protective
paint system in accordance with ISO 12944 Corrosivity Category “C4”
with Medium Durability. The Priming coat(s) shall be Epoxy based and
top coat shall be polyurethane based with color shade not other than
RAL 7032 or 7035.

Appropriate bonding / adhesion material such as Etch Primer is

recommended for use with Galvanized Surfaces before application of
above mentioned protective paint system.

The Contractor shall submit following documents pertaining to protective

paint system for approval of the Engineer,

- Paint manufacturer’s confirmation that proposed paint system is

compatible with the intended surface to be coated
- Paint manufacturer’s confirmation that proposed paint products are
compatible with each other
- Paint products catalogues
- OEM’s recommended surface preparation methodology
- No. of coats
- DFT per coat

4.2 16 A Schuko Socket Outlets (Weather proof)

16 Amp Socket Outlets shall be 2 pin + earth German type (Schuko) socket
outlets with faceplate of colour as approved by the Engineer.

The outlets shall be heavy-duty type suitable for mounting on LT outdoor

Distributor. The 16 Amp Schuko Socket Outlets shall be designed such that the
earth pin of plug is engaged to socket earth prior to making contact to the live
contacts.

Weather proof socket outlet shall be designed for outdoor use or in areas heavily
exposed to dust and / or splashing water. The socket outlet shall be constructed
from extremely robust polycarbonate that provides minimum degree of ingress
protection of IP55. If the specified degree of IP protection cannot be achieved
then the socket outlet shall be supplied with suitable weather proof enclosure.

4.3. Street Lighting Column

For street lighting, lightning columns shall be supplied in total construction

heights of pole as shown on Drawings.

On top of each lighting columns there shall be either one or two bracket mounted
lanterns with suitable adapters provided. Ratings of the lanterns shall be as
specified in the contract drawings and specification section 8150. The street light

Construction of Bridge at Korangi Causeway 8290-3 Miscellaneous Items

 arrangement and conduits shall be as per “Electrical Details”.

All lighting columns shall be of steel (conforming to BS EN 40-5) tubular tapered/

octagonal above the anchor plate with construction heights as specified in the
drawings and longitudinally welded. The welding shall be complying with
BS EN 1011; no circumferential weld shall be accepted. The size of base plate
and bolts will be as per manufacturer’s recommendation or relevant structural
drawing. The steel used for fabrication shall have minimum yield strength as
recommended by the Manufacturer. The lighting columns shall be suitable for
UBC 97 exposure”C” and at the basic, wind speed specified in clause 3.0 of
specification section 8001.

All columns and accessories such as anchor bolts, doors, adaptors, shim plates
etc., shall be galvanized in full bath process and coated as specified in 4.6.1.
After galvanizing the threads of the anchor bolts shall be re-cut and greased.

The Contractor shall submit a civil drawing regarding the foundation of the
Lighting Pole in consultation with the Pole Manufacturer and as shown in
‘electrical details’ drawing. The parameters required for pole foundation are
dimension and weight of the selected light fixture, dimension and weight of Pole,
design wind velocity as mentioned in Contract specification section-8001 along
with seismic calculation for the zone mentioned in the specification

The Contractor shall submit a pole design drawing in consultation with the Pole
Manufacturer in accordance with the project requirement and as shown in
‘Electrical details’ drawing for engineer review and approval.

Lighting columns shall be welded to anchor plates by means of appropriate

gusset plates. For cable access to the light pole a hole of at least 150 mm
diameter shall be provided in the middle section of the anchor plate.
Approximately 800 mm above the anchor plate a lockable door shall be
provided. The door shall have a minimum size of 120 mm x 350 mm or as
approved by the Engineer. Inside the door there shall be a baseboard arranged
with a channel for mounting the cable termination and circuit breaker / MCB
block as shown in “Electrical Details” drawing An earth connection terminal
screw of at least M8 mm shall be provided on the baseboard. The doors shall be
fitted with tamper proof locks.

Cable connection – circuit breaker / MCB blocks (as per number of lights) shall
be provided in every light pole and shall have cable supports and terminals for at
least 2 cables 5 x 25 sq.mm. Screw in sufficient number and size shall be
provided. The design of the cable connection, circuit breaker / MCB block shall
be as required. Each light fixture on pole shall have separate circuit breaker /
MCB.

The arm/bracket length shall vary as per site condition. In all cases the length of
bracket shall be such that overhang (the distance from center of light fixture to
the kerb) shall not be less than 0.5 meters.

4.3.1 Protective paint system

All street lighting poles/ columns shall be coated with protective paint
system in accordance with ISO 12944 Corrosivity Category “C4” with
Medium Durability. The Priming coat(s) shall be Epoxy based and top
coat shall be polyurethane based with color shade not other than RAL
7032 or 7035.

Appropriate bonding / adhesion material such as Etch Primer is

recommended for use with Galvanized Surfaces before application of
above mentioned protective paint system.

Construction of Bridge at Korangi Causeway 8290-4 Miscellaneous Items

 The Contractor shall submit following documents pertaining to protective
paint system for approval of the Engineer,

- Paint manufacturer’s confirmation that proposed paint system is

compatible with the intended surface to be coated
- Paint manufacturer’s confirmation that proposed paint products are
compatible with each other
- Paint products catalogues
- OEM’s recommended surface preparation methodology
- No. of coats
- DFT per coat
5 INSTALLATION

5.1. General

The mounting heights, depths and other dimensions of all the Miscellaneous
Items are stated on the drawings or in general notes. In case of any
discrepancy, the instructions of the Engineer shall be obtained before fixing the
item.

5.2. Hot dipped galvanized M.S. Cable Trays / Trunking / Ladders with protective
paint system

The cable trays / trunking shall be installed on supports fixed to the wall and/or
ceilings/trusses. The supports shall be fixed to civil works by means of Rawl
bolts. The additional hangers and other metalwork required for the installation of
the trays / trunking shall be galvanized and finished by method as specified for
the cable tray / trunking.

The distance between alternate supports (span) in straight runs shall be finalized
as per loading and in no case shall exceed 2 metres. In addition to these,
supports shall be provided near each bend or change in direction, end of
trunking/ tray.

The straight jointing, bends and other accessories shall be fixed with cable tray/
trunking in such a manner that they are in one line with no sharp edges/
protruded surfaces. Rivet head nuts shall be installed on inner side of tray/
trunking.

On straight lengths over 65’-8” (20 meter) and at every building expansion joint
suitable flexible expansion couplers shall be provided.

At each joint, bend earth continuity shall be ensured by using copper earth braid
and copper lugs in electro-tinned finish.

5.3. 16A Schuko socket outlets (weatherproof)

The wiring accessories shall be mounted as stated on the drawings. In case the
mounting height is not mentioned, the instructions of the Engineer at site shall be
obtained before fixing.

5.4. Street Lighting Column

Foundation blocks shall be generally in reinforced concrete, Class ‘B’ (grade 25)
type and in accordance with approved structural calculation. Construction of
foundation blocks shall be according to the relevant drawings or as
recommended by the manufacturer. The foundation designed shall be able to
bear the wind velocity as mentioned in specification section-8001.

Construction of Bridge at Korangi Causeway 8290-5 Miscellaneous Items

 The Contractor shall submit civil works drawings in consultation with the pole
manufacturer for engineer review and approval.

Lighting column and necessary accessories shall be delivered free at location of

use and be unloaded and set up ready for service and operation.

In addition, at least 10 pieces of setting templates for each size light poles shall
be included in the scope of supply.

Expenses for auxiliary tools and equipment, such as crane and operator shall
incorporated in the tender bids. The cable opening and all gaps shall be filled
with approved watertight material.

The transport of the poles to site shall be carried out in a neat and clean manner.
Steel/wood racks with grooves shall be supplied for stacking of poles to prevent
any direct contact with ground. Any pole damaged during transportation or
storage shall be replaced and any damage to paint work shall be made good by
the Contractor at his own cost.

6 MEASUREMENT AND PAYMENT

6.1. General

The Contractor’s bid amount against each Bill of Quantities item as given below
shall include supply, installation, testing, commissioning and completion for all
work specified herein, as shown on the Tender Drawings and given in the Bill of
Quantities related to the item.

6.2. Hot dipped galvanized M.S. Cable Trays / Trunking / Ladders with protective
paint system

6.2.1 Measurement:

Measurement shall be made for the total running meters of each size of
M.S. cable tray/cable trunking with all accessories acceptably supplied
and installed by the contractor.

6.2.2 Payment:

Payment shall be made for the total running meters as provided above
at the contract unit price and shall constitute full compensation for
supplying, installing, and completion of each size of M.S cable tray/cable
trunking for cables complete with all installation material and accessories
such as covers, mounting brackets, bend, elbow, nuts and bolts etc.

6.3. Street Lighting Column

6.3.1 Measurement:

Measurement shall be made for the total number of each type of lighting
column including civil works, foundation as per ambient condition, Load
requirements and with all accessories acceptably supplied and installed
by the contractor as complete unit.

6.3.2 Payment:

Payment shall be made for the total number of units measured as

provided above at the contract unit price each and shall constitute full
compensation for supplying, installing, and commissioning of security

Construction of Bridge at Korangi Causeway 8290-6 Miscellaneous Items

 flood lighting column including civil works, foundation as per ambient
condition and Load requirements, complete with all installation material
and accessories.

No separate payments shall be made for the under mentioned specified

work related to the supply and installation of Street Lighting Column.
The cost thereof shall be deemed to have been included in the quoted
rates of above work.

- Protective paint system on all metal works in accordance with

ISO 12944 Corrosivity Category “C4” with Medium Durability.

- Civil works for foundation

*** End of Section 8290 ***

Construction of Bridge at Korangi Causeway 8290-7 Miscellaneous Items