262921 Enclosed Switches and Circuit Breakers - Copy.docx
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This document is a technical specification for enclosed switches and circuit breakers, detailing requirements for electrical equipment rated 600V and below. The specification covers fused and unfused disconnect switches, circuit breakers, and related components, with comprehensive guidelines for product characteristics, installation, testing, and quality assurance. Key technical requirements include specifications for switch mechanisms (quick-make, quick-break type), copper blades, external operating handles with lockout provisions, arc chutes, mechanical interlocks, and various enclosure types. The document provides detailed requirements for different switch ratings, fuse classifications, and installation standards, referencing relevant industry standards from NEMA, NEC, and UL.
The specification is structured in three main parts: General (administrative requirements), Products (detailed technical specifications), and Execution (installation and testing guidelines). Notable technical requirements include horsepower ratings, solid neutrals, ground lugs, and specific enclosure finish specifications. The document allows for customization through deletable/optional sections marked with //___//, enabling adaptation to specific project needs. Submission requirements include detailed shop drawings, manufacturer certifications, maintenance manuals, and pre-installation documentation. The specification is intended to ensure high-quality electrical switching equipment meets professional engineering standards and safety regulations.
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Text version
11-01-22
SECTION 26 29 21
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
SPEC WRITE NOTE: Delete between //___// if not applicable to project. Also delete any other item or paragraph not applicable to the section and renumber the paragraphs.
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 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Requirements for seismic restraint of non-structural components.// |
| B. | Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: Requirements that apply to all sections of Division 26. |
| C. | Section 26 05 19, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES: Low-voltage conductors. |
| D. | 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. |
| E. | Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduits. |
| F. | 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. |
SPEC WRITER NOTE: Include the following paragraph for projects in seismic areas of moderate-high, high and very high seismicities as listed in Table 4 of VA Handbook H-18-8, Seismic Design Requirements. Coordinate with the structural engineer.
| //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-21 | 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): |
| 70-23 | National Electrical Code (NEC) |
| E. | Underwriters Laboratories, Inc. (UL): |
| 98-16 | Enclosed and Dead-Front Switches |
| 248 1-11 | Low Voltage Fuses |
| 489-16 | 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 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. |
| //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 SPEC WRITE NOTE: Edit the paragraph below to conform to project requirements.
| 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 //Resident Engineer// //COR//.
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