MRC NEW FACILITY IN MINA ABDULLAH
SECTION 16110
CONDUIT
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
1.1.1 To be read in conjunction with Division - General Requirements, and Conditions of Contract.
1.1 DESCRIPTION:
A. DESCRIPTION OF SYSTEM:
1. Light and power circuits, fire alarm, telephone, Data, Security, Public address
system, SMATV, Quematic, ,Audio-Visual & Video conferencing, control
signal and other low voltage/current system wiring and cables feeding
equipment. Distribution boards shall be drawn in conduits, unless otherwise
indicated.
2. Conduit system shall generally be concealed and installed as indicated.
3. Normal light and power circuits, emergency light and power circuits, fire alarm
wiring, telephone wiring, signal wiring and low current system wiring shall
each be run in separate conduit and wire way installations.
4. Cables insulated for two different categories of circuit shall be segregated
irrespective of service.
5. Conduit and fittings used shall be:
a) Where embedded or above false ceilings: heavy gauge rigid PVC,
minimum wall thickness of 2mm.
b) Where surface mounted, exposed conduit: galvanized steel.
c) Where installed in flame proof and hazardous areas: galvanized steel.
B. RELATED WORK SPECIFIED ELSEWHERE :
1. Wires and Cables : Section 16120
2. Wiring Devices : Section 16145
1.2 QUALITY ASSURANCE
APPLICABLE STANDARDS referred to in this Section:
1. Relevant British Standards.
2. MEW / S-1.
The Contractor may propose alternative codes and standards, providing the Contractor can
demonstrate that the minimum quality for materials, products and workmanship will not be
reduced and they are submitted to the Architect for his review and approval in advance of
their use.
1.3 SUBMISSIONS:
A. SAMPLES:
Cut away samples of all sizes of conduits, conduit boxes and fittings of each type
shall be fixed to a board and submitted to the Engineer.
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MRC NEW FACILITY IN MINA ABDULLAH
B. PRODUCT DATA:
At time of submitting samples submit manufacturers' details, catalogues and copies
of test certificates confirming that offered types comply with the Specification.
C. SHOP DRAWINGS:
Submit drawings of proposed conduit layout and obtain approval before commencing
work.
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MRC NEW FACILITY IN MINA ABDULLAH
PART 2 PRODUCTS
2.1 RIGID PVC CONDUIT AND FITTINGS
A. STANDARDS:
Conduit and fittings shall comply with relevant BS standards. In addition, conduit and
fittings shall comply with this specification where requirements are more stringent.
B. PHYSICAL PROPERTIES:
Conduit and fittings shall be:
i) Resistant to high temperatures.
ii) Nonhygroscopic.
iii) Self extinguishing.
iv) Of adequate insulation resistance and electric strength.
v) Inert to all liquid normally discharged from residential, commercial and
industrial premises.
vi) Suitable for installation, storage and transportation at temperatures expected
at site and at these temperatures shall not:
1. Soften or suffer any structural degradation.
2. Show signs of cracking, or deform so that cables cannot be easily
drawn in or are likely to be damaged when drawing in, when bent,
compressed or exposed to extreme temperature.
vii) Of adequate mechanical strength and thermal stability.
viii) Suitably and indelibly marked and identified. Markings shall include nominal
size and be easily legible.
ix) Smooth inside and out and free from burrs and sharp edges surfaces and
corners over which cables may be drawn shall be smooth and rounded.
x) All the PVC conduits shall be heavy duty ( red) with minimum wall thickness
of 2mm only
C. SIZES OF CONDUIT:
1. Minimum 20mm, unless otherwise indicated.
2. Where size is not indicated: select in accordance with the regulations and as
a function of the number and size of conductors.
3. All the low voltage system conduit minimum size shall be 25 mm only , unless
otherwise mentioned.
D. FITTINGS:
Conduit entries shall be designed to ensure a watertight joint.
E. EXPANSION FITTINGS:
Expansion fittings shall be fabricated from material equal or equivalent to that of the
conduit with which the coupling is to be used. Factory installed packing ring and
pressure ring shall be provided to prevent entrance of moisture.
F. VINYL CEMENT:
If required to ensure a watertight joint between conduit and fittings no hardening type.
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MRC NEW FACILITY IN MINA ABDULLAH
2.2 FLEXIBLE CONDUIT:
A. FLEXIBLE STEEL CONDUIT:
Flexible conduit shall be liquid tight. Conduit shall be galvanized and shaped into
interlocking convolutions of uniform cross section, providing a smooth interior and
exterior surface. The convolutions shall be firmly joined to one another to assure a
complete lock without impeding the flexibility of the conduit. The conduit shall have
flame and abrasion resistant black liquid tight extended P.V.C. jacket with continuous
built in copper bonding conductor. The conduit shall conform to relevant BS
standards for liquid tight flexible steel conduit.
2.3 GALVANIZED STEEL CONDUIT:
A. GALVANIZED STEEL CONDUIT:
Surface mounted conduit shall be of rigid, heavy gauge, threaded, hot dip galvanized
steel manufacture. No conduit less than 20mm diameter shall be used. The Conduit
shall conform to relevant BS standards for galvanized steel conduit.
2.4 RECOMMENDED MANUFACTURER:
Al – Adasani - Kuwait
National Industries - Kuwait.
Al-Kharafi Pipes - Kuwait
Maruchi - Japan
Ega Tubes - UK
Copex - UK ( Flexible conduits)
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MRC NEW FACILITY IN MINA ABDULLAH
PART 3 EXECUTION
3.1 PREPARATION:
A. SETS AND BENDS:
1. Conduits up to 32mm diameter: form on site with an approved bending
machine, taking care not to deform conduit.
2. Conduits over 32mm diameter: use coupling fittings.
3.2 INSTALLATION OF CONDUIT:
A. GENERALLY:
1. Run conduit in square, symmetrical lines, parallel to or at right angles to walls
2. Provide adequate means for drainage of condensation and proper ventilation.
3. Do not damage structure.
4. Do not run conduit through structure unless otherwise indicated.
5. Conduit runs between drawn positions shall not have more than two 90°
bends, or the equivalent. Length of such runs shall not exceed 10m.
6. Installation shall permit easy drawing in of cables.
7. Keep conduits at least 100mm from pipes and other non electrical services.
8. Install conduit so as not to interfere with ceiling inserts, lights or ventilation
outlets.
B. RUNS IN REINFORCED CONCRETE:
1. Obtain approval for placing steel sleeves before pouring concrete.
2. Run conduits in concrete slabs parallel to main reinforcing steel.
3. Additional openings in finished slabs, where approved, shall be made by
drilling, not by breaking.
C. HORIZONTAL OR CROSS RUNS:
To be avoided in partitions and side walls.
D. SURFACE MOUNTED CONDUIT (including conduit installed above false ceiling):
Fix with distance spacing saddles to allow conduits to be taken directly into
accessories without bends or sets.
Any conduit installed in false ceiling shall be fixed to the main
structure and not the false ceiling.
E. CONCEALED CONDUIT:
1. Fix securely to prevent movement before casting of concrete and screeds,
application of plaster and the like.
2. Spacing of clips shall be not greater than as follows:
CONDUIT SIZE SPACING
Up to 25mm 600mm
32 38mm 900mm
50mm 1000mm
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MRC NEW FACILITY IN MINA ABDULLAH
3. Supports for exposed conduit shall be fixed at each side of bends.
G. EXPANSION FITTINGS:
Fix in conduit wherever it crosses an expansion joint in the structure to which it is
fixed.
H. TERMINATIONS:
Make with a flanged coupling, lead washer and hexagonal male brass bush, where
conduit runs terminate in cable trunking, distribution boards or any sheet metal
structure.
I. ENDS OF CONDUITS AND OUTLET BOXES AWAITING FIXTURES OR CABLES:
Plug with two or other approved material (not paper) to exclude dirt.
J. CONDUIT BOXES:
Fix at all outlet points.
3.3 INSTALLATION OF FLEXIBLE CONDUIT:
A. FLEXIBLE CONDUIT:
1. Fix at final connections to motors and other equipment liable to vibration.
2. Fix a through type conduit box to the rigid conduit system before conversion
to flexible.
3. Provide heat resistant ( minimum temp 180 deg Cent. ) silicon silicon flexible
cables for final connection of light fittings along with 3way circuit ceiling roses.
B. EARTHING:
Run an insulated copper earthing conductor, unless otherwise mentioned in drawing,
sized in accordance with specified regulations, within the flexible conduit and solidly
bond to rigid conduit system and metal work of the equipment.
END OF SECTION
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