Project: Bayt Jameel Precast Factory Division 16
King Abdullah Economic City, Rabigh Transfer Switches
SECTION 16495
TRANSFER SWITCHES
PART 1 - GENERAL
1.01 SUMMARY
A. This Section includes transfer switches rated 600 V and less and the following items:
1. Automatic transfer switch.
2. Bypass/isolation switch.
3. Non-automatic transfer switch.
4. Remote annunciation system.
1.02 SUBMITTALS
A. Product Data: For each switch specified. Include dimensioned plans, sections, and
elevations showing minimum clearances, conductor entry provisions, gutter space,
installed features and devices, and materials lists.
B. Wiring Diagrams: Details of wiring for transfer switches and differentiating between
manufacturer-installed and field-installed wiring. Show both power and control wiring.
C. Single-Line Diagram: For each combined transfer switch and bypass/isolation switch,
show connections between transfer switch, bypass/isolation switch, power sources,
and load; and show provisions.
D. Product Certificates: Signed by manufacturer certifying that products furnished
comply with requirements and that switches have been tested for short-circuit closing
and withstanding ratings applicable to units for project.
E. Qualification Data: For firms and persons specified in the “Quality Assurance” Article.
F. Field Test Reports: Indicate and interpret test results for compliance with
performance requirements.
G. Maintenance Data: For each type of product to include in the maintenance manuals
specified in section 16010. Include all features and operating sequences, both
automatic and manual.
1.03 QUALITY ASSURANCE
A. Type Test Qualifications: Should be presented for the products and witnessed by
international third party testing Agency for compliance of the products to standards
and requirement.
B. Emergency Service: (Local representative). Manufacturer shall maintain Emergency
center with the area of the project or a responsive local representative for emergency
maintenance and repairs at project site at his works within 24-hours maximum
response time.
C. Source Limitations: Obtain automatic transfer switch, bypass/isolation switch, non-
automatic transfer switch, remote annunciators, and and remote annunciator and
control panels from a single manufacturer who assumes responsibility for all
components.
D. Standards:
V3 Middle East Engineering Consultants Co. Section 16495 Page 1 of 7
Jeddah, K.S.A
October, 2015
Project: Bayt Jameel Precast Factory Division 16
King Abdullah Economic City, Rabigh Transfer Switches
1. Comply with ISO 3046 and relevant IEC standards or equal and the following:
a) NFPA 99 standards for Essential Electrical systems for Health care
facilities and NFPA 110 “Standards for Emergency and standards by
power system.
b) Comply with IEC 529, Enclosure protection classes of NEMA
equivalent standards.
PART 2 - PRODUCTS
2.01 MANUFACTURERS
A. Manufacturers; Subject to compliance with requirements, provide products by one of
the following or equal approved:
1. Conventional Transfer Switches:
a. Caterpillar, Inc.; Engine Division.
b. Emerson Electric Co.: Automatic switch Co. Subsidiary
c. Generac Corp.
d. Kohler Co.; Generator Division.
e. Onan Corp.; Electrical Products Division.
f. Group schnider
g. Zenith Controls, Inc.
2. Transfer Switches Using Molded-Case Switches or Circuit Breakers:
a. Eaton Corp.; Westinghouse & Cutler-Hammer Products.
b. Group schnieder.
c. ABB
d. Lack shore Electric corp.
2.02 GENERAL TRANSFER-SWITCH PRODUCT REQUIREMENTS
A. Number of poles, Current and voltage ratings: As indicated.
1. Units smaller than 600A: Do not have derating current rating for different
classes or mixtures of loads, including 100 percent tungsten filament lamp or
100 percent inductive load.
2. Units 600 Amperes and larger have current ratings that apply to mixtures of
loads including 30 percent tungsten filament lamp load.
B. Tested Fault-Current Ratings: Closing and withstand rating exceed the indicated
available rms. Symmetrical fault current at the equipment terminals based on testing
according to IEC 947 or UL 1008 at full – rated system voltage and 20 percent power
factor. Rate each product for withstand duration time as following when tested for
rated short – circuit current correlated with the actual type of circuit protection device
indicated for transfer switches for this project.
1. Molded case circuit breaker,150 Ampere or smaller: 1.5 closing and withstand
duration cycles.
2. Molded case circuit breakers, larger than 150 Amperes: 3 closing and
withstand duration cycles.
3. Power Circuit Breaker: 10 closing and withstand duration cycles.
V3 Middle East Engineering Consultants Co. Section 16495 Page 2 of 7
Jeddah, K.S.A
October, 2015
Project: Bayt Jameel Precast Factory Division 16
King Abdullah Economic City, Rabigh Transfer Switches
4. Current – Limiting Fuses: 0.5 (nominal) closing and withstand duration
cycles.
C. Annunciation and Control Interface Components: Devices at transfer switches for
communicating with remote annunciataors or annunciator and control panels have
communications capability matched with the remote device.
D. Solid-State Controls: Repetitive accuracy of all settings is plus or minus 2 percent or
better over an operating temperature range of minus 20 deg C to 70 deg C.
E. Resistance to Damage by Voltage Transients: According to IEC standards or ANS 1-
C37 – 90 – 1 – and NEMA ICS – 1.
F. Neutral Terminal: Where 2 – or 3 – pole switches are indicated, provide fully rated
soil un-switched neutral terminal, unless otherwise indicated.
G. Four-Pole Switches: Where-4-pole switches are indicated, provide neutral switches.
H. Oversize Neutral: For equipment associated with non-liners loads and as indicated,
ampacity and switch rating of neutral are double the normal rating of the switch.
I. Enclosures: IP 42 to IEC 529 or equivalent NEMA type enclosure, unless otherwise
indicated.
J. Factory Wiring: Train and bundle factory wiring and label consistent with Shop
Drawings, either by color code or by numbered or lettered wire and cable type
markers at termination.
1. Designated Terminals: Pressure type suitable for types and sizes of field
wiring indicated.
2. Power-Terminal Arrangement and Field – Wiring Space; Suitable for top, side,
or bottom entrance of feeder conductors as indicated.
3. Control Wiring; Equipped with lugs suitable for connection to terminal strips.
K. Electrical Operation: Accomplish by a non-fused, momentarily energized solenoid or
electric motor-operated mechanism, mechanically and electrically interlocked in both
directions.
L. Switch Characteristics: Designed for continuous-duty repetitive transfer of full-rated
current between active power sources.
1. Limitation: Switches using molded-case switch or insulated-case circuit-
breaker components and switches using contactors not designed for
continuous-duty repetitive switching between active power sources are not
acceptable.
2. Switch Action: Double throw; mechanically held in both directions.
3. Switch Contacts: Silver composition for load current switching. Units rated
225 Ampere and more have separate arcing contacts.
M. Over current devices are not part of switch products.
2.03 AUTOMATIC TRANSFER SWITCH
A. Comply with ISO 3046/IEC and level 1 equipment according to NFPA 110.
(Standards for Emergency and stand by power systems).
B. Time delay for override of normal-source voltage sensing delays transfer and engine
start signals. Adjustable 0 to 6 seconds and factory set at 1 second.
V3 Middle East Engineering Consultants Co. Section 16495 Page 3 of 7
Jeddah, K.S.A
October, 2015
Project: Bayt Jameel Precast Factory Division 16
King Abdullah Economic City, Rabigh Transfer Switches
C. Voltage/Frequency Lockout Relay: Prevents premature transfer to an emergency
generator set. Pickup voltage is adjustable from 85 to 100 percent of nominal.
Factory set to pickup at 90 percent. Pickup frequency is adjustable from 90 to 100
percent of nominal. Factory set to pickup at 95 percent.
D. Time delay for Retransfer to Normal Source: Adjustable from 0 to 30 minutes and
factory set at 10 minutes. Provides automatic defeat of the delay on loss of voltage
or sustained under voltage of the emergency source, provided normal supply has
been restored.
E. Test Switch: Simulates normal-source failure.
F. Switch-Position Pilot Lights: Indicate source to which load is connected.
G. Source-Available Indicating Lights: Supervise sources via the transfer-switch, normal
and emergency-source sensing circuits.
1. Normal Power Supervision: Green light with nameplate engraved “Normal
Source Available.”
2. Emergency Power Supervision: Red light with nameplate engraved
“Emergency Source Available”.
H. Unassigned Auxiliary Contacts: 2 normally open single-pole, double-throw contacts
for each switch position, rated 10 A at 120V, ac.
I. Transfer Override Switch: Overrides automatic retransfer control so automatic
transfer switch will remain connected to emergency power source regardless of the
condition of the normal source. A pilot light indicates override status.
J. Engine Starting Contacts: 1 isolated, normally closed and 1 isolated, normally open.
Contacts are gold flashed or gold plated and rated 10 A at 32 V, dc minimum.
K. Engine Shutdown Contacts: Time delay adjustable from 0 to 5 minutes; factory set at
5 minutes. Initiates shutdown at remote engine-generator controls after retransfer of
load to normal source.
2.05 BYPASS/ISOLATION SWITCH
A. Comply with requirements for level equipment NFPA110 Or equal 150/IEC standards.
B. Description: Manual type, arranged to select and connect either source of power
directly to the load, isolating the transfer switch from the load and from both power
sources. Include the following features for each combined automatic transfer switch
and bypass/isolation switch.
1. Means to lock the bypass/isolation in the position that isolates, the transfer
switch, while isolated. While isolated, interlocks prevent transfer-switch
operation except for testing or maintenance.
2. Draw-out Arrangement for transfer Switch: Provides physical from live parts
and accessibility for testing and maintenance operations.
3. Bypass/Isolation switch current, voltage, closing, and short-circuit withstand
ratings: equal to or greater than those of the associated automatic transfer
switch, and with the same phase arrangement and number of poles.
4. Contact temperatures of bypass/isolation switches do not exceed those of
automatic transfer-switch contacts when they are carrying rated load.
V3 Middle East Engineering Consultants Co. Section 16495 Page 4 of 7
Jeddah, K.S.A
October, 2015
Project: Bayt Jameel Precast Factory Division 16
King Abdullah Economic City, Rabigh Transfer Switches
5. Operability: Constructed so load bypass and transfer-switch isolation can be
performed by 1 person in no more than 2 operations in 15 seconds or less.
6. Legend: Manufacturer’s standard legend for control labels and instruction
signs give detailed operating instructions.
7. Maintainability: Fabricate to allow convenient removal of major components
from the front without removing other parts or main power conductors.
C. Interconnection of Bypass/Isolation Switches with Automatic Transfer Switches:
Factory – installed copper bus bars, plated at connection points and braced for the
indicated available short-circuit current.
2.06 MANUAL NON-AUTOMATIC TRANSFER SWITCH
A. Comply with the requirements of IEC 947 and or NFPA 110 for non-automatic
transfer switches.
B. Operation: By external manual handle operatble only with door closed, provide quick
make quick break manual switching action, Switch is capable of manually transferring
the load in either direction with either or both sources energized.
C. Double-Throw Switching Arrangement: Incapable of pauses or intermediate position
stops during switching sequence.
D. Mechanical position indication for either sources.
2.07 REMOTE ANNUNCIATION SYSTEM
A. Remote annunciation system for condition at indicated transfer switch shall be via
building automation system and shall include the following:
1. Sources available, as defined by actual pickup and dropout settings of
transfer-switch controls.
2. Switch position.
3. Switch in test mode.
2.08 FINISHES
A. Enclosures: Manufacturer’s standard enamel over corrosion-resistant pretreatment
and primer.
2.09 SOURCE QUALITY CONTROL
A. Factory Test Components, Assembled switches and Associated Equipment: Ensure
proper operation. Check transfer time and voltage, frequency, and time delay settings for
compliance with specified requirements. Perform dielectric strength test complying with
IEC standards or NEMA ICSI.
PART 3 - EXECUTION
3.01 INSTALLATION
A. Floor mounting of Switches: Level and anchor unit to floor.
V3 Middle East Engineering Consultants Co. Section 16495 Page 5 of 7
Jeddah, K.S.A
October, 2015
Project: Bayt Jameel Precast Factory Division 16
King Abdullah Economic City, Rabigh Transfer Switches
B. Identify components according to Division 16 Section “Electrical Identification”.
C. Identify components according to Division 6 Section “Basic Electrical Materials and
Methods”.
3.02 WIRING TO REMOTE COMPONENTS
A. Match type and number of cables and conductors to control and communications
requirements of transfer switches used. Increase raceway sizes at no additional cost to
Owner if necessary to accommodate required wiring.
3.03 CONNECTIONS
A. Tighten factory made connections, including connectors, terminals, bus joints,
mountings, and grounding. Tighten field connected connectors and terminals
including screws and bolts, according to equipment manufacturer’s published torque
tightening values. When manufacturer’s torque requirements are not indicated,
tighten connectors and terminals to comply with tightening torque specified in UL
standards 486 A & 486 B.
B. Grounding: make equipment grounding connections for transfer switch units as
indicated and specified in division 16 Section “Grounding”.
3.04 FIELD QUALITY CONTROL
A. Preliminary Tests: Perform electrical tests as recommended by manufacturer and as
follows:
1. Measure phase-to-phase and phase-to-ground insulation resistance levels
with insulation resistance tester. Include external annunciator and control
circuits. Use test voltages and procedure recommended by manufacturer.
Meet manufacturer’s specified minimum resistance.
2. Check for electrical continuity of circuits and for short circuits.
B. Field Tests: Give 7 days’ advance notice of tests and perform testes in presence of
Owner/s representative.
C. Coordinate tests with tests of generator plant and run them concurrently.
D. Tests: As recommended by manufacturer and under his representative supervision
and as follows:
1. Contact Resistance Test: Measure resistance of power contacts for
automatic transfer switches, non-automatic transfer switches, and
bypass/isolation switches. Resolve values in excess of 500 micro-ohms and
differences between adjacent poles exceeding 50 percent.
2. Operational Tests: Demonstrate interlocking sequence and operational
function for each switch at least 3 times.
a. Simulate power failures of normal source to automatic transfer
switches and of emergency source with normal source available.
b. Simulate low phase-to-ground voltage for each phase of normal
source to automatic transfer switches.
c. Verify time-delay settings and pickup and dropout voltages.
V3 Middle East Engineering Consultants Co. Section 16495 Page 6 of 7
Jeddah, K.S.A
October, 2015
Project: Bayt Jameel Precast Factory Division 16
King Abdullah Economic City, Rabigh Transfer Switches
E. Test Failures: Correct deficiencies identified by tests and prepare for retest. Verify
that equipment meets specified requirements.
F. Reports: Maintain a written record of observations and tests. Report defective
materials and workmanship and retest corrected items. Record adjustable relay
settings and measured insulation and contact resistances and time delays. Attach a
label or tag to each tested component indicating satisfactory completion of tests.
END OF SECTION 16495
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Jeddah, K.S.A
October, 2015
