SECTION 16450:
NON-AUTOMATIC TRANSFER SWITCH / QUICK CONNECT GENERATOR
SWITCHBOARD <S> <OM>
PART 1 - GENERAL
1.1
A.
1.2
RELATED DOCUMENTS
Drawings and general provisions of the Contract, including General Conditions,
and other applicable specification sections in the Project Manual apply to the work
specified in this Section.
SUMMARY
A.
Scope:
Furnish and install a service entrance rated non-automatic transfer switch (NTS)
with number of poles, amperage, voltage, withstand and close-on ratings as
shown on the plans and describe herein.
B.
Section Includes: The work specified in this Section includes, but shall not be
limited to, service and distribution switchboards rated 600 volts and less.
1.3
REFERENCES
A.
General: The publications listed below form a part of this Specification to the
extent referenced. The publications are referred to in the text by the basic
designation only. The edition/revision of the referenced publications shall be the
latest date as of the date of the Contract Documents, unless otherwise specified.
B.
ASTM (ASTM):
1. ASTM E 329, "Standard Specification for Agencies Engaged in the Testing
and/or Inspection of Materials Used in Construction."
C.
Federal Specifications (FS):
1. FS W-C-375, "Circuit Breakers, Molded Case, Branch Circuit and Service."
D.
Institute of Electrical and Electronics Engineers, Inc. (IEEE):
1. ANSI/IEEE C57.13, "Standard Requirements for Instrument Transformers"
(copyrighted by IEEE, ANSI approved).
E.
International Electrical Testing Association (NETA):
1. NETA ATS, "Acceptance Testing Specifications for Electrical Power
Distribution Equipment and Systems."
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F.
International Organization for Standardization (ISO):
1. ISO 9001, "Quality Management Systems - Requirements."
G.
National Electrical Contractors Association (NECA):
1. NECA 400, “Standard for Installing and Maintaining Switchboards"
(copyrighted by NECA, ANSI approved).
H.
National Electrical Manufacturers Association (NEMA):
1. NEMA EI 21.1, "Instrument Transformers for Revenue Metering (110 kV BIL
and Less).”
2. NEMA KS 1, "Enclosed and Miscellaneous Distribution Equipment Switches
(600 Volts Maximum)" (copyrighted by NEMA, ANSI approved).
3. NEMA PB 2, "Deadfront Distribution Switchboards."
4. NEMA PB 2.1, "General Instructions for Proper Handling, Installation,
Operation and Maintenance of Deadfront Distribution Switchboards Rated
600 Volts or Less."
I.
National Fire Protection Association (NFPA):
1. NFPA 70, "National Electrical Code" (copyrighted by NFPA, ANSI
approved) - hereinafter referred to as NEC.
2. NFPA 70B, “Electrical Equipment Maintenance.”
3. NFPA 70E, “Standard for Electrical Safety in the Workplace.”
J.
Underwriters Laboratories, Inc. (UL):
1. UL 98, "Standard for Enclosed and Dead-Front Switches" (copyrighted by UL,
ANSI approved).
2. UL 489, "Standard for Molded-Case Circuit Breakers and Circuit Breaker
Enclosures."
3. UL 891, "Standard for Dead-Front Switchboards" (copyrighted by UL, ANSI
approved).
4. UL 943, "Standard for Ground-Fault Circuit Interrupters" (copyrighted by UL,
ANSI approved).
5. UL 1283, “Standard for Safety for Electro-Magnetic Interference Filters"
(copyrighted by UL, ANSI approved).
6. UL 1449, "Standard for Surge Protective Devices."
1.4
A.
SUBMITTALS
Product Data: Submit product data showing material proposed. Submit sufficient
information to determine compliance with the Drawings and Specifications. Submit
product data for each type of switchboard, overcurrent protective device, surge
protective device, ground-fault protector, accessory, and component indicated.
Include dimensions and manufacturer’s technical data on features, performance,
electrical characteristics, ratings, and finishes.
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B.
Shop Drawings: Submit shop drawings for each product and accessory required.
Include information not fully detailed in manufacturer’s standard product data.
Submit shop drawings for each switchboard and related equipment.
1. Indicate front and side enclosure elevations with overall dimensions, conduit
entrance locations and requirements, nameplate legends, one-line diagrams,
equipment schedule and switchboard instrument details.
C.
Wiring Diagrams: Submit wiring diagrams detailing power, signal, and control
systems, clearly differentiating between manufacturer-installed wiring and
field-installed wiring, and between components provided by the manufacturer and
those provided by others.
D.
Contract Closeout Submittals:
1. Operation and Maintenance Data: Submit operation and maintenance data
for switchboards along with other required information as per specification
section 16010.
2. Warranty Data: Submit manufacturer's standard warranty documents.
1.5
QUALITY ASSURANCE
A.
Qualifications:
1. Manufacturer Qualifications: Manufacturer shall be a firm engaged in the
manufacture of switchboards of types and sizes required, and whose products
have been in satisfactory use in similar service for a minimum of 20 years.
a. The manufacturer shall be ISO 9001 certified and shall be designed to
internationally accepted standards.
b. Equipment shall comply with most recent “ARAA Made in America”
requirements.
2. Installer Qualifications: Installer shall be a firm that shall have a minimum of
five years of successful installation experience with projects utilizing
switchboards similar in type and scope to that required for this Project.
B.
Regulatory Requirements: Comply with applicable requirements of the laws,
codes, ordinances, and regulations of Federal, State, and local authorities having
jurisdiction. Obtain necessary approvals from such authorities.
C.
Standards: Comply with applicable requirements of the following standards:
1. NEMA PB 2.
2. NEC.
3. NFPA 70B.
4. NFPA 70E.
5. UL 98.
6. UL 489.
7. UL 943.
8. FS W-C-375.
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9. NEC702
Meet requirements for optional standby systems by providing key interlocking
of the main and generator circuit breakers to manually transfer power
between sources. An NEC 702 compliance label shall be affixed to the front
of the switchboard to make it easy for inspectors to verify code compliance.
D.
1.6
Electrical Components, Devices, and Accessories: Electrical components,
devices, and accessories shall be listed and labeled as defined in NEC,
Article 100, by an inspecting and testing agency acceptable to authorities having
jurisdiction, and marked for intended use.
DELIVERY, STORAGE, AND HANDLING
A.
Deliver materials to the Project site in supplier’s or manufacturer’s original
wrappings and containers, labeled with supplier’s or manufacturer’s name,
material or product brand name, and lot number, if any.
B.
Store materials in their original, undamaged packages and containers, inside a
well-ventilated area protected from weather, moisture, soiling, extreme
temperatures, and humidity.
1.7
A.
WARRANTY
General: 18 months from time of shipment.
PART 2 - PRODUCTS
2.1
A.
2.2
MANUFACTURERS
Basis of Design: Equipment manufactured by Square D by Schneider Electric
was used as the Basis of Design for this project. Equivalent products by ASCO or
PowerSecure shall also be accepted. Items specified are to establish a standard
of quality for design, function, materials, and appearance. The Architect/Engineer
will be the sole judge of the basis of what is equivalent.
MANUFACTURED UNITS
Front and Rear Accessible Switchboard:
A.
Nominal System Voltage: Nominal system voltage shall be 208Y/120 volts.
B.
Main Bus Continuous: Provide 3000 ampere rating.
C.
Short Circuit Current Rating: 65 kA
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D.
Enclosure: Provide steel enclosure, in compliance with UL 891, Nema type 3R.
Provide 3” high mounting Channels
E.
Enclosure Finish: Provide factory-applied finish in manufacturer's standard gray
finish over a rust-inhibiting primer on treated metal surface.
F.
Barriers: Provide barriers between each switchboard section for isolation.
G.
Strip Heaters: Provide factory-installed electric strip heaters of sufficient wattage
in each vertical section to maintain enclosure temperature above expected dew
point.
1. Strip Heater Control: Provide thermostats to maintain temperature of each
section above expected dew point.
2. Strip Heater Power Source: Provide 120 volt external branch circuit.
H.
Front Covers: Front covers shall be screw removable with a single tool and
doors shall be hinged with removable hinge pins.
1. Set back from front to clear circuit breaker removal mechanism.
2. Removable covers shall form top, front, and sides. Top covers at rear shall be
easily removable for drilling and cutting.
I.
Buses and Connections: Three phase, four wire, unless otherwise indicated.
Provide hard-drawn plated copper of 98 percent conductivity.
1. Ground Bus: Size per current NEC and UL 891 Tables 28.1 and 28.2,
hard-drawn copper of 98 percent conductivity, equipped with pressure
connectors for feeder and branch circuit ground conductors.
2. Bus Composition: Plating shall be applied continuously to bus work. The
switchboard bussing shall be of sufficient cross-sectional area to meet UL 891
temperature rise requirements. The phase and neutral through-bus shall have
an ampacity as shown on the Drawings. For four-wire systems, the neutral
shall be of equivalent ampacity as the phase bus bar. Tapered bus is not
permitted. Full provisions for the addition of future sections shall be provided.
Bussing shall include, but shall not be limited to, necessary hardware to
accommodate splicing for future additions.
3. Isolation Barrier Access Provisions: Permit checking of bus bolt tightness.
4. Outgoing Load Connections: Provide mechanical load lugs in separate
section/compartment. Provide lugs for 8 conductors per phase and neutral
sized to accommodate 3/0 to 750 Kcmil Copper or Aluminum conductors.
.
2.3
A.
MAIN OVERCURRENT PROTECTIVE DEVICES
Generator Main Breaker :
1. Thermal magnetic/basic electronic circuit breakers. – Rated 2000AT/2500AF
2. Electronic trip, standard.
3. Lugs: Mechanical style, suitable for 6 per phase, 3/0 to 500kCM , Type W
flexible welding cable conductors.
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4. Key Interlock Kit: Externally mounted to prohibit circuit breaker operation;
key shall be removable only when circuit breaker is in off position. Key
Interlock with Utility Main Breaker to prevent both breakers from being closed
at same time.
B.
Utility Main Breaker, Insulated Case Circuit Breaker: Fully rated, encased
power circuit breaker with interrupting capacity rating to meet available fault
current of 65K AIC.
1. Mounting: Fixed circuit breaker mounting.
2. Closing: Two-step, stored energy closing.
3. Trip Units: Microprocessor-based trip units with interchangeable rating plug,
LED trip indicators, and the following field-adjustable settings:
a. Instantaneous trip.
b. Long-time and short-time pickup levels.
c. Long-time and short-time time adjustments with I2t response.
4. Key Interlock Kit: Externally mounted to prohibit circuit breaker operation; key
shall be removable only when circuit breaker is in off position. Key Interlock
with Generator Breaker to prevent both breakers from being closed at same
time.
C.
2.4
Control Wiring: Factory-installed, with bundling, lacing, and protection included.
Provide flexible conductors for No. 8 AWG and smaller for conductors across
hinges.
IDENTIFICATION
A.
Mimic Bus: Provide an anodized aluminum or plastic engraved plaque. Arrange
in single-line diagram format, using symbols and letter designations consistent with
final mimic bus diagram. Produce a concise visual presentation of principal
switchboard components and connections.
B.
Sequence of Operation Name Plate: Manufacturer shall provide instructions on
an engraved nameplate permanently attached to the front cover of the
compartment.
Loss of Utility Power
1. Open all distribution breakers.
2. Open the main breaker and rotate the key A1 to lock the breaker in the open position
– key is now removable.
3. Remove generator breaker lugs cover.
4. Connect generator cables to the generator breaker incoming lugs per the connection
sequence label.
5. Verify proper phase and voltage connection.
6. Remove key from the lock and insert it into the lock on the generator breaker.
7. Rotate key A1 to unlock generator breaker, key is now held captive.
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8. Start generator.
9. Verify proper voltage L–L and L–N and proper phase rotation.
10. Close generator breaker, close appropriate distribution breakers.
Return of Utility Power
1. Open distribution breakers.
2. Open generator breaker and rotate the key A1 to lock the breaker in the open
position – key is now removable.
3. Remove key from the lock and insert into the lock on the main breaker.
4. Shut down generator.
5. Disconnect generator cables per the connection sequence label.
6. Replace all covers.
7. Rotate key A1 to unlock the main breaker, key is now held captive.
8. Close main breaker, close all distribution breakers
PART 3 - EXECUTION
3.1
A.
EXAMINATION
Verification of Conditions: Installing contractor shall examine areas and
conditions under which the work is to be installed, and notify the owner and
engineer in writing of any conditions detrimental to the proper and timely
completion of the work. Do not proceed with the work until the owner and
engineer have responded to all concerns.
1. Beginning of the work shall indicate acceptance of the areas and conditions as
satisfactory by the Installer.
3.2
A.
INSTALLATION
General: Preparation and installation shall be in accordance with reviewed
product data, final shop drawings, manufacturer’s written recommendations, and
as indicated on the Drawings.
1. Install switchboards and accessories according to NEMA PB 2.1 and
NECA 400.
2. Install and anchor switchboards level on concrete bases, 4 inch (102 mm)
nominal thickness.
3. Remove temporary lifting eyes, channels, and brackets and temporary
blocking of moving parts from switchboard units and components.
4. Frame and mount the printed basic operating instructions for switchboards,
including, but not limited to, control and key interlocking sequences and
emergency procedures. Fabricate frame of finished wood or metal and cover
instructions with clear acrylic plastic. Mount on front of switchboards. Where a
Nema 3R enclosure is utilized, it shall be mounted inside the exterior door.
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5. Install overcurrent protective devices, surge protective devices, and
instrumentation.
a. Set field-adjustable switches and circuit breaker trip ranges.
B.
3.3
A.
3.4
A.
Identification:
1. Identify field-installed conductors, interconnecting wiring, and components;
provide warning signs as specified in section 16050 - BASIC ELECTRICAL
MATERIALS AND METHODS and required by the NEC.
2. Label each switchboard compartment with engraved metal or laminated plastic
nameplate mounted with corrosion-resistant screws.
FIELD QUALITY CONTROL
Install and test equipment in accordance with the manufactures written
instructions.
PROTECTION
Provide final protection and maintain conditions in a manner acceptable to the
owner, that shall ensure that the switchboards shall be without damage at time of
Substantial Completion.
END OF SECTION
16450-8