Specifications 262300.docx

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5925--598-21-3-8200-0017 Little Rock VA Switchgear Upgrade 598-21-133
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36C25621R0116
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This document includes specifications for a low-voltage switchgear upgrade project and details of a related federal contract opportunity notice. The specifications cover requirements for furnishing and installing new low-voltage switchgear, including circuit breakers, control equipment, enclosures, buses, and other components. The specifications provide technical requirements and include references to applicable industry standards.

The related federal contract opportunity is for upgrading the switchgear at the John L. McClellan Memorial Veterans Hospital in Little Rock, Arkansas. The project scope involves replacing circuit breakers, installing remote operator panels and control switches, and correcting breaker wiring. The acquisition is reserved for Service-Disabled Veteran Owned Small Businesses. The estimated value is between $1 million and $5 million. The solicitation is scheduled for release on June 9, 2021 under NAICS code 236220. Interested vendors must register at the federal contracting website and in the Vendor Information Pages database to receive notifications.

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01-01-17

SECTION 26 23 00

LOW-VOLTAGE SWITCHGEAR

PART 1 GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing, installation, connection, and testing of low-voltage switchgear, indicated as switchgear in this section.

1.2 RELATED WORK

A.Section 03 30 00, CAST-IN-PLACE CONCRETE: Requirements for concrete equipment pads.
B.Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Requirement for seismic restraint for nonstructural components.
C.Section 25 10 10, ADVANCED UTILITY METERING: Electric meters installed in switchgear.
D.Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: Requirements that apply to all sections of Division 26.
E.Section 26 05 19, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES: Low-voltage conductors.
F.Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path for possible fault currents.
G.Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduits.
H.Section 26 05 73, OVERCURRENT PROTECTIVE DEVICE COORDINATION STUDY: Short circuit and coordination study, and requirements for a coordinated electrical system.
I.Section 26 11 16, SECONDARY UNIT SUBSTATIONS: Secondary unit substations.
J.Section 26 23 13, GENERATOR PARALLELING CONTROLS: For switchgear used as part of a generator paralleling system.
K.Section 26 25 11, BUSWAYS: Feeder busways and fittings.
L.Section 26 43 13, SURGE PROTECTIVE DEVICES: For surge protective devices integral to the switchgear.

1.3 qualITY ASSURANCE A. Quality Assurance shall be in accordance with Paragraph, QUALIFICATIONS (PRODUCTS AND SERVICES) in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS.

1.4 FACTORY TESTS

A.Factory Tests shall be required.
B.Factory Tests shall be in accordance with Paragraph, MANUFACTURED PRODUCTS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements:
C.Switchgear shall be tested, with the circuit breakers in the connected position in their compartments. Tests shall be in accordance with IEEE C37.20.1 and NEMA C37.51. Factory tests shall be certified, and shall include the following tests:
1.Design tests.
2.Production tests.
3.Conformance tests.
D.The following additional tests shall be performed:
1.Verify that circuit breaker sizes and types correspond to drawings, and the Overcurrent Protective Device Coordination Study.
2.Verify tightness of bolted electrical connections by calibrated torque-wrench method in accordance with manufacturer’s published data.
3.Confirm correct operation and sequencing of key-type mechanical interlock systems for multiple circuit breakers by attempting closure on locked-open devices, and attempting to open locked-closed devices, and making key exchange with devices operated in off-normal positions.
4.Verify correct barrier and shutter installation and operation.
5.Exercise all active components.
6.Inspect indicating devices for correct operation.
7.Perform an insulation-resistance test, phase to ground, on each bus section, with phases not under test grounded, in accordance with manufacturer’s published data.
8.Perform insulation-resistance tests on control wiring with respect to ground. Applied potential shall be 500 V DC for 300-volt rated cable and 1000 V DC for 600-volt rated cable, or as required if solid-state components or control devices cannot tolerate the applied voltage.
9.If applicable, verify correct function of control transfer relays located in the switchgear with multiple control power sources.
10.Perform phasing checks on double-ended or dual-source switchgear to insure correct bus phasing from each source.

1.5 SUBMITTALS

A.Submit in accordance with Paragraph, SUBMITTALS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements:
1.Shop Drawings:
a.Switchgear shop drawings shall be submitted simultaneously with or after the Overcurrent Protective Device Coordination Study.
b.Submit sufficient information to demonstrate compliance with drawings and specifications.
c.Prior to fabrication of switchgear, submit the following data for approval:
1)Complete electrical ratings.
2)Circuit breaker sizes.
3)Interrupting ratings.
4)Safety features.
5)Accessories and nameplate data.
6)Switchgear one line diagram, showing ampere rating, number of bars per phase and neutral in each bus run (horizontal and vertical), bus spacing, equipment ground bus, and bus material.
7)Elementary and interconnection wiring diagrams.
8)Technical data for each component.
9)Dimensioned exterior views of the switchgear.
10)Dimensioned section views of the switchgear.
11)Floor plan of the switchgear.
12)Foundation plan for the switchgear.
13)Provisions and required locations for external conduit and wiring entrances.
14)Approximate design weights.
d.Certification from the manufacturer that representative switchgear has been seismically tested to International Building Code requirements. Certification shall be based upon simulated seismic forces on a shake table or by analytical methods, but not by experience data or other methods.
2.Manuals:
a.Submit, simultaneously with the shop drawings, companion copies of complete maintenance and operating manuals, including technical data sheets, wiring diagrams, and information for ordering replacement parts.
1)Schematic signal and control diagrams, with all terminals identified, matching terminal identification in the switchgear.
2)Include information for testing, repair, trouble shooting, assembly, disassembly, and factory recommended/required periodic maintenance procedures and frequency.
3)Provide a replacement and spare parts list. Include a list of tools and instruments for testing and maintenance purposes.
b.If changes have been made to the maintenance and operating manuals originally submitted, submit updated maintenance and operating manuals two weeks prior to the final inspection.
3.Certifications: Two weeks prior to final inspection, submit the following.
a.Certification by the manufacturer that switchgear conforms to the requirements of the drawings and specifications.
b.Certification by the Contractor that switchgear has been properly installed, adjusted, and tested.

1.6 APPLICABLE PUBLICATIONS

A.Publications listed below (including amendments, addenda, revisions, supplements, and errata), form a part of this specification to the extent referenced. Publications are referenced in the text by basic designation only.
B.Institute of Engineering and Electronic Engineers (IEEE):
C37.13-15Low-voltage AC Power Circuit Breakers Used in Enclosures
C37.20.1-15Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear
C57.13-16Instrument Transformers
C62.41.1-08Surge Environment in Low-voltage (1000V or less) AC Power Circuits
C62.45-92Surge Testing for Equipment connected to Low-Voltage AC Power Circuits
C.International Code Council (ICC):
IBC-15International Building Code
D.National Electrical Manufacturers Association (NEMA):
C37.51-03Metal-Enclosed Low Voltage AC Power Circuit Breaker Switchgear Assemblies — Conformance Test Procedures
C37.51A-10Metal-Enclosed Low Voltage AC Power Circuit Breaker Switchgear Assemblies — Conformance Test Procedures Amendment 1 Short-Time Withstand Current Tests
E.National Fire Protection Association (NFPA):
70-17National Electrical Code (NEC).
F.Underwriters Laboratories, Inc. (UL):
891-05Switchboards
977-12Safety Fused Power-Circuit Devices
1053-15Ground Fault Sensing and Relaying Equipment
1558-99Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear

PART 2 PRODUCTS

2.1 GENERAL

A.Shall be in accordance with IEEE, NEMA, NFPA, UL, as shown on the drawings, and have the following features:
1.Switchgear shall be a complete, grounded, continuous-duty, integral assembly, metal clad, dead-front, dead-rear, self-supporting, indoor type switchgear assembly. Incorporate devices shown on the drawings and all related components required to fulfill operational and functional requirements.
2.Switchgear shall be //Type 1 front accessible// //Type 2 front, side, and rear accessible//.
3.Ratings shall not be less than shown on the drawings. Short circuit ratings shall not be less than what is required by NFPA 70.
4.Switchgear shall conform to the arrangements and details shown on the drawings.
5.Coordinate all requirements with the electric utility company supplying electrical service to the switchgear. The incoming electric utility feeder and revenue metering installation shall conform to the requirements of the electric utility company.
6.Key-type mechanical interlocks for multiple circuit breakers shall be provided as shown on the drawings.
7.Switchgear shall be assembled, connected, and wired at the factory so that only external circuit connections are required at the construction site. Split the structure only as required for shipping and installation. Packaging shall provide adequate protection against rough handling during shipment.
8.All non-current-carrying parts shall be grounded per Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS for additional requirements.

2.2 HOUSING

A.Shall have the following features:
1.Frames and enclosures:
a.The assembly shall be braced with reinforcing gussets using //bolted connections//jig welds// to assure rectangular rigidity.
b.The enclosure shall be steel, leveled, and not less than the gauge required by applicable publications.
c.Die-pierce the holes for connecting adjacent structures to insure proper alignment, and to allow for future additions.
d.All bolts, nuts, and washers shall be //zinc-plated//cadmium-plated// steel.
2.Circuit breaker compartments:
a.An individual compartment shall be supplied for each circuit breaker and each future circuit breaker as shown on the drawings. Compartments shall be provided with isolated wireways for control wiring between devices.
1)Separate each compartment so that the circuit breaker, buses, and cable terminations are in separate compartments with steel partitions or barriers of approved and properly installed insulation.
2)Each compartment furnished with a circuit breaker (active or spare) shall be fully equipped as noted on drawings and specified below.
3)Each compartment noted as space for future circuit breaker, as shown on drawings, shall be fully equipped for positioning and connecting the breaker. Provide all equipment required to implement the future breaker installation.
3.Auxiliary compartments:
a.Compartments shall be provided for auxiliaries, metering, and transition or termination sections as required by the manufacturer, and as shown on drawings. Compartments shall be provided with isolated wireways for control wiring between devices.
4.Compartment doors:
a.The doors shall permit convenient removal and interchanging of circuit breakers between compartments. The doors shall be capable of a swing approaching 180 degrees.
b.Concealed or semi-concealed hinges shall be provided to attach the doors. Weld the hinges to the equipment structure and to the compartment doors.

SPEC WRITER NOTE: Edit the following for indoor or outdoor application.

B.Finish:
1.All metal surfaces shall be thoroughly cleaned, phosphatized and factory primed prior to applying baked enamel or lacquer finish.
2.Provide a light gray finish for indoor switchgear.

2.3 BUSES

A.Bus Bars and Interconnections:
1.Provide copper phase and neutral buses, fully rated for the amperage as shown on the drawings for the entire length of the switchgear. Bus laminations shall have a minimum of 6 mm (1/4 inch) spacing.
2.Mount the buses on appropriately spaced insulators and brace to withstand the available short circuit currents.
3.The bus and bus compartment shall be designed so that the acceptable NEMA standard temperature rises are not exceeded.
4.Install a copper ground bus the full length of the switchgear assembly.
5.Main Bonding Jumper: An un-insulated copper bus, size as shown on drawings, shall interconnect the neutral and ground buses, when the switchgear is used to establish the system common ground point.
6.All bolts, nuts, and washers shall be //zinc-plated//cadmium-plated// steel. Bolts shall be torqued to the values recommended by the manufacturer.
7.Make provisions for future bus extensions by means of bolt holes or other approved method.

2.4 LOW-VOLTAGE POWER CIRCUIT BREAKERS

A.General: Circuit breakers shall be dead front, drawout, stored energy type with solid state trip devices. Arcing contacts shall be renewable.
B.Rating: Circuit breakers shall be 3 pole, 600 volts AC and below, 60 cycle with frame size, trip rating and functions, and system voltage as shown on drawings. Breakers shall have 30 cycle short time current ratings.
C.Drawout Mounting: Provide a racking mechanism to position and hold the breaker in the connected, test, or disconnected position. Provide an interlock to prevent movement of the breaker into or out of the connected position unless the breaker is tripped open.
D.Trip Devices: Breakers shall be electrically and mechanically trip free and shall have trip devices in each pole. Unless otherwise indicated on drawings, each breaker shall have overcurrent and short-circuit, and integral ground fault trip devices. Trip devices shall be of the solid state type with adjustable pick-up settings, with both long time and short time elements, and integral trip unit testing provisions. Devices shall have time-delay band adjustment. Long-time delay element shall have inverse time characteristics. Main circuit breakers shall not have instantaneous trip function.
E.Position Indicator: Provide a mechanical indicator visible from the front of the unit to indicate whether the breaker is open or closed.
F.Trip Button: Equip each breaker with a mechanical trip button accessible from the front of the door.
G.Padlocking: Provisions shall be included for padlocking the breaker in the open position.
H.Operation: Unless otherwise indicated herein or on the drawings, breakers 1600 ampere frame size and less shall be manually operated. Breakers larger than 1600 ampere frame size shall be electrically operated.
I.When used as generator paralleling switchgear, breakers shall be electrically operated.

J. Fused Circuit Breakers: The fuses used with combination fused breakers shall be high-interrupting capacity current-limiting type and coordinated with the circuit breaker. Fuses shall be on the line side of the breaker on a common drawout carriage (except 3000 and 4000 ampere breakers). Circuit breakers of 3000 and 4000 ampere frame size may have their fuses in a separate compartment with drawout mounting. A feature shall be included which trips the breaker when any fuse blows. An interlock shall prevent the reclosure of the breaker until the blown fuse is replaced. A blown fuse indicator shall be provided on the front of the breaker. In the case of fuses in a separate compartment, an interlock shall be provided to require the breaker to be open before it is possible to open the fuse compartment door.

2.5 ELECTRIC UTILITY COMPANY EQUIPMENT

A.Provide separate compartment for electric utility company metering equipment as shown on drawings.
B.Provide suitable arrangements within the electric utility company metering compartment for mounting metering equipment. Obtain the electric utility company's approval of the compartment arrangements prior to fabrication of the switchgear.
C.Allow access to electric utility company personnel as required for installation of utility metering equipment.

2.6 metering

A.Refer to Section 25 10 10, ADVANCED UTILITY METERING. Refer to drawings for meter locations.
B.As necessary, provide compartment with a front hinged door to provide safe isolated access to meters and all associated terminal and fuse blocks for maintenance, calibration, or testing.
C.Provide current transformers for each meter. Current transformers shall be wired to shorting-type terminal blocks.
D.Provide voltage transformers including primary fuses and secondary protective devices for metering as shown on the drawings.

2.7 OTHER EQUIPMENT

A.Furnish tools and accessories required for circuit breaker and switchgear test, inspection, maintenance, and proper operation.
B.Panelboards: Requirements for panelboards shown to be installed in the switchgear shall be as shown on the drawings and in Section 26 24 16, PANELBOARDS.
C.Circuit breaker removal equipment: Furnish a portable circuit breaker removal lift and carriage for installation and removal of circuit breakers.

2.10 CONTROL WIRiNG

A. Switchgear control wires shall not be less than No. 14 AWG copper 600 V rated. Install wiring complete at the factory, adequately bundled and protected. Provide separate control circuit fuses in each breaker compartment and locate for ease of access and maintenance.

2.11 NAMEPLATES AND MIMIC BUS

A.Nameplates: For Normal Power system, provide laminated black phenolic resin with white core with 12 mm (1/2 inch) engraved lettered nameplates next to each circuit breaker. For Essential Electrical System, provide laminated red phenolic resin with white core with 12 mm (1/2 inch) engraved lettered nameplates next to each circuit breaker. Nameplates shall indicate equipment served, spaces, or spares in accordance with one line diagram shown on drawings. Nameplates shall be mounted with plated screws on front of breakers or on equipment enclosure next to breakers. Mounting nameplates only with adhesive is not acceptable.
B.Mimic Bus: Provide an approved mimic bus on front of each switchgear assembly. Color shall be black for the Normal Power system and red for the Essential Electrical System, either factory-painted plastic or metal strips. Plastic tape shall not be used. Use symbols similar to one line diagram shown on drawings. Plastic or metal strips shall be mounted with plated screws.

PART 3 EXECUTION

3.1INSTALLATION
A.Installation shall be in accordance with the NEC, as shown on the drawings, and manufacturer’s instructions.
B.Anchor switchgear with rustproof bolts, nuts, and washers not less than 13 mm (1/2 inch) diameter, in accordance with manufacturer’s instructions, and as shown on drawings.
C.Exterior Location. Mount switchgear on concrete slab. Unless otherwise indicated, the slab shall be at least 200 mm (8 inches) thick, reinforced with a 150 by 150 mm (6 by 6 inches) No. 6 mesh placed uniformly 100 mm (4 inches) from the top of the slab. Slab shall be placed on a 150 mm (6 inches) thick, well-compacted gravel base. The top of the concrete slab shall be approximately 100 mm (4 inches) above the finished grade. Edges above grade shall have 15 mm (1/2 inch) chamfer. The slab shall be of adequate size to project at least 200 mm (8 inches) beyond the equipment. Provide conduit turnups and cable entrance space required by the equipment to be mounted. Seal voids around conduit openings in slab with water- and oil-resistant caulking or sealant. Cut off and bush conduits 75 mm (3 inches) above slab surface. Concrete work shall be as specified in Section 03 30 00, CAST-IN-PLACE CONCRETE.
D.Interior Location. Mount switchgear on concrete slab. Unless otherwise indicated, the slab shall be at least 100 mm (4 inches) thick. The top of the concrete slab shall be approximately 100 mm (4 inches) above finished floor. Edges above floor shall have 15 mm (1/2 inch) chamfer. The slab shall be of adequate size to project at least 100 mm (8 inches) beyond the equipment. Provide conduit turnups and cable entrance space required by the equipment to be mounted. Seal voids around conduit openings in slab with water- and oil-resistant caulking or sealant. Cut off and bush conduits 75 mm (3 inches) above slab surface. Concrete work shall be as specified in Section 03 30 00, CAST-IN-PLACE CONCRETE.

3.2 Acceptance Checks and Tests

A.Perform in accordance with the manufacturer's recommendations. In addition, include the following:
1.Visual Inspection and Tests:
a.Compare equipment nameplate data with specifications and approved shop drawings.
b.Inspect physical, electrical, and mechanical condition.
c.Confirm correct application of manufacturer's recommended lubricants.
d.Verify appropriate anchorage, required area clearances, and correct alignment.
e.Verify that circuit breaker sizes and types correspond to approved shop drawings.
f.Verifying tightness of accessible bolted electrical connections by calibrated torque-wrench method, or performing thermographic survey after energization.
g.Confirm correct operation and sequencing of key-type mechanical interlock systems.
h.Vacuum-clean switchgear enclosure interior. Clean switchgear enclosure exterior.
i.Inspect insulators for evidence of physical damage or contaminated surfaces.
j.Verify correct shutter installation and operation.
k.Exercise all active components.
l.Verify the correct operation of all sensing devices, alarms, and indicating devices.
m.Verify that vents are clear.
2.Electrical tests:
a.Perform insulation-resistance tests on each bus section.
b.Perform insulation-resistance test on control wiring; do not perform this test on wiring connected to solid-state components.
c.Perform phasing check on double-ended switchgear to ensure correct bus phasing from each source.
B.Prior to the final inspection for acceptance, a technical representative from the electric utility company shall witness the testing of the equipment to assure the proper operation of the individual components, and to confirm proper operation/coordination with electric utility company’s equipment.

3.3 Follow-Up Verification

A. Upon completion of acceptance checks, settings, and tests, the Contractor shall show by demonstration in service that the switchgear is in good operating condition and properly performing the intended function.

3.4 Temporary Heating

A. Apply temporary heat to switchgear, according to manufacturer's written instructions, throughout periods when switchgear environment is not controlled for temperature and humidity within manufacturer's stipulated service conditions.

3.5 WARNING SIGN

A. Mount on each entrance door of the switchgear room, approximately 1500 mm (5 feet) above grade or floor, a clearly lettered warning sign for warning personnel. The sign shall be attached with rustproof metal screws.

3.6 ONE LINE DIAGRAM and sequence of operation

A.At final inspection, an as-built one line diagram shall be laminated or mounted under acrylic glass, and installed in a frame mounted in the switchgear room or in the outdoor switchgear enclosure.
B.Furnish a written sequence of operation for the switchgear and connected line side/load side electrical distribution equipment. The sequence of operation shall be laminated or mounted under acrylic glass, and installed in a frame mounted in the switchgear room or in the outdoor switchgear enclosure.
C.Deliver an additional four copies of the as-built one line diagram and sequence of operation to the COR.

3.7 AS-LEFT TRIP UNIT SETTINGs

A.The trip unit settings shall be set in the field by an authorized representative of the switchgear manufacturer per the approved Overcurrent Protective Device Coordination Study in accordance with Section 26 05 73, OVERCURRENT PROTECTIVE DEVICE COORDINATION STUDY.
B.The trip unit settings of the main breaker(s) shall be reviewed by the electric utility company to assure coordination with the electric utility company primary fusing. Prior to switchgear activation, provide written verification of this review to the COTR.
C.Post a durable copy of the "as-left" trip unit settings in a convenient location in the switchgear room. Deliver four additional copies of the settings to the COR prior to the activation of the switchgear.

3.8 INSTRUCTION

A. Furnish the services of a factory-trained technician for two, 4-hour training periods for instructing personnel in the maintenance and operation of the switchgear, on the dates requested by the COR.

---END---

26 23 00 - 1

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