VA 26 29 21-2010 DISCONNECT SWITCHES.pdf

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1、09-10 26 29 21 - 1 SECTION 26 29 21 DISCONNECT SWITCHES 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 This section specifies the furnishing, install

2、ation, and connection of low voltage disconnect switches. 1.2 RELATED WORK A. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one section of Division 26. B. Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS A

3、ND CABLES 600 VOLTS AND BELOW: Cables and wiring. 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 for cables an

4、d wiring. E. Section 26 29 11, LOW-VOLTAGE MOTOR STARTERS: Motor rated toggle switches. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 SUBMITTALS A. Submit in accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL

5、INSTALLATIONS. B. Shop Drawings: 1. Clearly present sufficient information to determine compliance with drawings and specifications. 2. Include electrical ratings, dimensions, mounting details, materials, enclosure types, and fuse types and classes. 3. Show the specific switch and fuse proposed for

6、each specific piece of equipment or circuit. C. Manuals: 1. Provide complete maintenance and operating manuals for disconnect switches, including technical data sheets, wiring diagrams, and information for ordering replacement parts. Deliver four copies to Provided by IHSNot for ResaleNo reproductio

7、n or networking permitted without license from IHS-,-,-09-10 26 29 21 - 2 the / Resident Engineer / COTR / two weeks prior to final inspection. 2. Terminals on wiring diagrams shall be identified to facilitate maintenance and operation. 3. Wiring diagrams shall indicate internal wiring and any inter

8、locking. D. Certifications: Two weeks prior to the final inspection, submit four copies of the following certifications to the /Resident Engineer/ /COTR/: 1. Certification by the manufacturer that the materials conform to the requirements of the drawings and specifications. 2. Certification by the c

9、ontractor that the materials have been properly installed, connected, 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 th

10、e text by designation only. B. National Electrical Manufacturers Association (NEMA): FU l-07 Low Voltage Cartridge Fuses KS l-06 Enclosed and Miscellaneous Distribution Equipment Switches (600 Volts Maximum) C. National Fire Protection Association (NFPA): 70-08 National Electrical Code (NEC) D. Unde

11、rwriters Laboratories, Inc. (UL): 98-04 Enclosed and Dead-Front Switches 248-00 . Low Voltage Fuses 977-94 . Fused Power-Circuit Devices PART 2 - PRODUCTS 2.1 LOW VOLTAGE FUSIBLE SWITCHES RATED 600 AMPERES AND LESS A. In accordance with UL 98, NEMA KS1, and NEC. B. Shall have NEMA classification Gen

12、eral Duty (GD) for 240 V switches and NEMA classification Heavy Duty (HD) for 480 V switches. C. Shall be 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 OFF position. 3. An arc chute for each pole. 4. Ex

13、ternal operating handle shall indicate ON and OFF position and have lock-open padlocking provisions. 5. Mechanical interlock shall permit opening of the door only when the switch is in the OFF position, defeatable to permit inspection. 6. Fuse holders for the sizes and types of fuses specified. Prov

14、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 29 21 - 3 /7. Electrically operated switches shall only be installed where shown on the drawings. / 8. Solid neutral for each switch being installed in a circuit which includes a neutral conductor.

15、 9. Ground lugs for each ground conductor. 10. Enclosures: a. Shall be the NEMA types shown on the drawings for the switches. b. Where the types of switch enclosures are not shown, they shall be the NEMA types most suitable for the ambient environmental conditions. Unless otherwise indicated on the

16、plans, all outdoor switches shall be NEMA 3R. c. Shall be finished with manufacturers standard gray baked enamel paint over pretreated steel (for the type of enclosure required). 2.2 LOW VOLTAGE UNFUSED SWITCHES RATED 600 AMPERES AND LESS Shall be the same as Low Voltage Fusible Switches Rated 600 A

17、mperes and Less, but without provisions for fuses. 2.3 LOW VOLTAGE FUSIBLE SWITCHES RATED OVER 600 AMPERES TO 1200 AMPERES Shall be the same as Low Voltage Fusible Switches Rated 600 Amperes and Less, except for the minimum duty rating which shall be NEMA classification Heavy Duty (HD). These switch

18、es shall also be HP rated. 2.4 MOTOR RATED TOGGLE SWITCHES Refer to Section 26 29 11, LOW-VOLTAGE MOTOR STARTERS. 2.5 LOW VOLTAGE CARTRIDGE FUSES SPEC WRITE NOTE: Edit the paragraph below to conform to project requirements. A. In accordance with NEMA FU1. B. Service Entrance: /Class L, fast acting/

19、/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/ /Clas

20、s 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/. Provided by IHSNo

21、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 29 21 - 4 PART 3 - EXECUTION 3.1 INSTALLATION A. Install disconnect switches in accordance with the NEC and as shown on the drawings. B. Fusible disconnect switches shall be furnished complete with fuses. Arran

22、ge fuses such that rating information is readable without removing the fuse. 3.2 SPARE PARTS Two weeks prior to the final inspection, furnish one complete set of spare fuses for each fusible disconnect switch installed on the project. Deliver the spare fuses to the /Resident Engineer/ /COTR/. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-