36C25622R0030 262921 Enclosed Switches and Circuit Breakers.docx
DOCX document 26 KB Posted
- Attached to
- Z2FB--Biloxi MATOC-Seed Project Project #520-22-122 FCA Corrections BLDG 17 - 36C25622R0030
- Solicitation number
- 520-22-122
About this file
This technical specification outlines requirements for enclosed switches and circuit breakers for a Department of Veterans Affairs project. Key details include the following. It specifies fused and unfused disconnect switches rated 600V and below to be furnished, installed, and connected. It requires NEMA classified general duty and heavy duty switches complete with features such as quick-make quick-break mechanisms, visible blades, arc chutes, lockable handles, and mechanical interlocks. It also requires separately enclosed circuit breakers per other specifications along with fuse holders and cartridge fuses for various applications. Installation must comply with NEC and manufacturer instructions, including seismic anchoring for switches in applicable areas. Testing and inspection is to be per manufacturer recommendations and includes visual, electrical, and mechanical checks.
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Text version
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
N/A
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. |
| c. | Certification from the manufacturer that representative enclosed switches and circuit breakers have 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 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 |
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 lockopen 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. |
| 10. | Electrically operated switches shall only be installed where shown on the drawings. |
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. |
2.5 cartridge fuses
| A. | Shall be in accordance with NEMA FU 1. |
| B. | Service Entrance: //Class L, fast acting// //Class L, time delay// //Class RK1, fast acting// //Class RK1, time delay// //Class J, fast acting// //Class J, time delay// //Class T, fast acting//. |
| C. | Feeders: //Class L, fast acting// //Class L, time delay// //Class RK1, fast acting// //Class RK1, time delay// //Class RK5, fast acting// //Class RK5, time delay// //Class J, fast acting Class J, time delay//. |
| D. | Motor Branch Circuits: //Class RK1// //Class RK5//, time delay. |
| E. | Other Branch Circuits: //Class RK1, time delay// //Class RK5, time delay// //Class J, fast acting// //Class J, time delay//. |
| F. | Control Circuits: Class CC, //fast acting// //time delay//. |
2.6 SEPARATELY-ENCLOSED CIRCUIT BREAKERS
| A. | Provide circuit breakers in accordance with the applicable requirements in Section 26 24 16, PANELBOARDS. |
| B. | Enclosures shall be the NEMA types shown on the drawings. Where the types are not shown, they shall be the NEMA type most suitable for the ambient environmental conditions. |
PART 3 - EXECUTION
3.1 INSTALLATION
| A. | Installation shall be in accordance with the NEC, as shown on the drawings, and manufacturer’s instructions. |
| B. | In seismic areas, enclosed switches and circuit breakers shall be adequately anchored and braced per details on structural contract drawings to withstand the seismic forces at the location where installed. |
| C. | Fused switches shall be furnished complete with fuses. Arrange fuses such that rating information is readable without removing the fuses. |
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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