262921 - Enclosed Switches and Circuit Breakers.pdf
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- Solicitation number
- 36C25621R0076
About this file
This solicitation is for a chiller plant upgrade project at the John L. McClellan VA Medical Center in Little Rock, Arkansas. The contractor shall provide all materials, equipment, labor, demolition, supervision and expertise necessary to perform work including general construction, fire protection, structural, architectural, mechanical and electrical work, and selective removal of existing construction in accordance with provided plans and specifications. The dollar value is estimated between $1,000,000 to $2,500,000 under NAICS code 236220 with a size standard of $36.5 million. This acquisition is set aside 100% for Service-Disabled Veteran Owned Small Businesses. Interested vendors must register in VETBIZ and acknowledge any amendments on the contract opportunities website to receive updates. The point of contact for inquiries is Bradley Martin at the Department of Veterans Affairs Veterans Health Administration Veterans Integrated Service Network 16. The anticipated solicitation issue date is on or about March 18, 2021.
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Upgrade Chiller Plant @JLM: Project 1 JLM Memorial Veterans Hospital
598-19-101 01-01-17
Construction Documents 2020.12.30
26 29 21 - 1
SECTION 26 29 21
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
PART 1 - GENERAL
1.1 DESCRIPTION
A. This section specifies the furnishing, installation, and connection of fused and unfused disconnect switches (indicated as switches in this section), and separately-enclosed circuit breakers for use in electrical systems rated 600 V and below.
1.2 RELATED WORK
A. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS:
Requirements that apply to all sections of Division 26.
B. Section 26 05 19, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES:
Low-voltage conductors.
C. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS:
Requirements for personnel safety and to provide a low impedance path for possible ground faults.
D. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduits.
E. Section 26 24 16, PANELBOARDS: Molded-case circuit breakers.
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 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. Submit sufficient information to demonstrate compliance with drawings and specifications.
b. Submit the following data for approval:
1) Electrical ratings, dimensions, mounting details, materials, required clearances, terminations, weight, fuses, circuit breakers, wiring and connection diagrams, accessories, and device nameplate data.
2. Manuals:
26 29 21 - 2
a. Submit complete maintenance and operating manuals including technical data sheets, wiring diagrams, and information for ordering fuses, circuit breakers, and replacement parts.
1) Include schematic diagrams, with all terminals identified, matching terminal identification in the enclosed switches and circuit breakers.
2) Include information for testing, repair, troubleshooting, assembly, and disassembly.
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 the enclosed switches and circuit breakers conform to the requirements of the drawings and specifications.
b. Certification by the Contractor that the enclosed switches and circuit breakers have been properly installed, adjusted, and tested.
1.5 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 designation only.
B. International Code Council (ICC):
IBC-15..................International Building Code
C. National Electrical Manufacturers Association (NEMA):
FU l-12.................Low Voltage Cartridge Fuses
KS l-13.................Heavy Duty Enclosed and Dead-Front Switches
(600 Volts Maximum)
D. National Fire Protection Association (NFPA):
70-17...................National Electrical Code (NEC)
E. Underwriters Laboratories, Inc. (UL):
98-16...................Enclosed and Dead-Front Switches
248 1-11................Low Voltage Fuses
489-13..................Molded Case Circuit Breakers and Circuit
Breaker Enclosures
26 29 21 - 3
PART 2 - PRODUCTS
2.1 FUSED SWITCHES RATED 600 AMPERES AND LESS
A. Switches shall be in accordance with NEMA, NEC, UL, as specified, and as shown on the drawings.
B. Shall be NEMA classified General Duty (GD) for 240 V switches, and NEMA classified Heavy Duty (HD) for 480 V switches.
C. Shall be horsepower (HP) rated.
D. Shall have the following features:
1. Switch mechanism shall be the quick-make, quick-break type.
2. Copper blades, visible in the open position.
3. An arc chute for each pole.
4. External operating handle shall indicate open and closed positions, and have lock-open padlocking provisions.
5. Mechanical interlock shall permit opening of the door only when the switch is in the open position, defeatable to permit inspection.
6. Fuse holders for the sizes and types of fuses specified.
7. Solid neutral for each switch being installed in a circuit which includes a neutral conductor.
8. Ground lugs for each ground conductor.
9. Enclosures:
a. Shall be the NEMA types shown on the drawings.
b. Where the types of switch enclosures are not shown, they shall be the NEMA types most suitable for the ambient environmental conditions.
c. Shall be finished with manufacturer’s standard gray baked enamel paint over pretreated steel.
2.2 UNFUSED SWITCHES RATED 600 AMPERES AND LESS
A. Shall be the same as fused switches, but without provisions for fuses.
2.3 FUSED SWITCHES RATED OVER 600 AMPERES TO 1200 AMPERES
A. Shall be the same as fused switches, and shall be NEMA classified Heavy
Duty (HD).
2.4 MOTOR RATED TOGGLE SWITCHES
A. Type 1, general purpose for single-phase motors rated up to 1 horsepower.
B. Quick-make, quick-break toggle switch with external reset button and thermal overload protection matched to nameplate full-load current of actual protected motor.
26 29 21 - 4
2.5 CARTRIDGE FUSES
A. Shall be in accordance with NEMA FU 1.
PART 3 - EXECUTION
3.1 INSTALLATION
A. Installation shall be in accordance with the NEC, as shown on the drawings, and manufacturer’s instructions.
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. Verify tightness of accessible bolted electrical connections by calibrated torque-wrench method.
d. Vacuum-clean enclosure interior. Clean enclosure exterior.
3.3 SPARE PARTS
A. Two weeks prior to the final inspection, furnish one complete set of spare fuses for each fused disconnect switch installed on the project.
Deliver the spare fuses to the COR.
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