VA 26 25 11-2009 BUSWAYS.pdf

1、4-09 26 25 11 - 1 SECTION 26 25 11 BUSWAYS SPEC WRITER 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, installation and co

2、nnection of the busways to form a complete coordinated system. 1.2 RELATED WORK A. Section 07 84 00, FIRESTOPPING: Sealing around penetrations to maintain the integrity of time rated construction. /B. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Requirement for sei

3、smic restraint for nonstructural components./ C. Section 07 92 00, JOINT SEALANTS: Sealing around busway penetrations through the building envelope to prevent moisture migration into the building. D. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements that ar

4、e common to more than one section of Division 26. E. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path to ground for possible ground fault currents. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Sectio

5、n 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 SUBMITTALS A. In accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, submit the following: B. Shop Drawings: 1. Sufficient information, clearly presented, shall be included to determine compliance with drawings and s

6、pecifications. 2. Include electrical ratings, dimensions, mounting details and position, mounting method, vertical supports, materials, fire stops, weather stops, and layout of the busway runs. 3. Show the detailed coordinated connections to equipment terminations such as switchgear, switchboards, t

7、ransformers and panelboards. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 25 11 - 2 4. Coordination Drawings: Submit floor plans and sections, drawn to scale. Include bus-assembly layouts and relationships between components and adjacent s

8、tructural, mechanical, and electrical elements. Indicate the following: a. Vertical and horizontal enclosed bus-assembly runs, offsets, and transitions. b. Clearances for access above and to the side of enclosed bus assemblies. Indicate sufficient clearance for tightening connections c. Vertical ele

9、vation of enclosed bus assemblies above the floor or bottom of structure. d. Support locations, type of support, and weight on each support. C. Manuals: 1. Provide complete maintenance and operating manuals including technical data sheets, and information for ordering replacement parts. 2. Two weeks

10、 prior to the final inspection, submit four copies of the manuals to the Resident Engineer. D. Certifications: Two weeks prior to final inspection, submit four copies of the following to the Resident Engineer: 1. Certification that the equipment has been properly installed, adjusted, and tested. 1.5

11、 APPLICABLE PUBLICATIONS Publications listed below (including amendments, addenda, revisions, supplement and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by the basic designation only. A. Underwriters Laboratories Inc. (UL): 857 Busways

12、B. National Fire Protection Association (NFPA): 70 . National Electrical Code (NEC) C. National Electrical Manufacturers Association (NEMA): BU 1 . Busways BU 1.1 . General Instructions for Handling, Installation, Operation and Maintenance of Busway Rated 600 Volts or Less BU 1.2 . Application Infor

13、mation for Busway Rated 600 Volts or Less Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 25 11 - 3 PART 2 - PRODUCTS 2.1 MATERIAL A. Busway shall be in accordance with UL 857 and NEMA BU 1, BU 1.1 and BU 1.2. B. Busway shall be rated as show

14、n on the drawings for the positions in which they are being installed, and have the following features: SPEC WRITER NOTE: Insure that the drawings show the type of busway desired for indoor use, feeder type or plug-in type. 1. For indoor locations, they shall be totally enclosed, low impedance type

15、and moisture resistant. 2. For outdoor locations, they shall be totally enclosed, low impedance, weatherproof, outdoor feeder type only. 3. Ratings shall not be less than required by the NEC and NEMA BU 1 and not less than shown on the drawings. Short circuit current ratings shall not be less than 4

16、2,000 amps, as required by NEMA BU 1 or as required for the available fault current shown on the drawings, whichever is higher. 4. Busway shall be 3-phase, 4-wire, full neutral except where 3-phase, 3-wire is shown on the drawings. 5. Busway shall include an internal ground bus bar, not less than 50

17、 percent of the phase bus. 6. All bus bars for each busway shall be within a single housing. Paralleled or multiple busways will not be accepted. 7. Bus Bars: a. Shall be full round edge rectangular 98% IACS (International Annealed Copper Standard) copper of sufficient cross-section to provide full

18、current rating without exceeding a hot spot temperature rise of 65 C in a 40 C ambient. b. Bus bar and interconnection joints shall be silver plated, constant high-pressure type with high strength, copper silicon alloy bolts, nuts and washers. c. Shall be completely insulated with flame-retardant, t

19、rack-resistant, self-extinguishing insulation. d. Temperature rises shall not exceed NEMA Standards. 8. Housings: a. Shall be /steel/ /aluminum/ with continuous mounting rails. b. Bus bar assemblies and housing shall be products of the same manufacturer. c. Shall be thoroughly cleaned and painted at

20、 the factory with primer and the manufacturers standard finish. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 25 11 - 4 d. Shall have rustproof metal hardware. e. At busway entrances to buildings, install external flanges and weatherproofin

21、g. f. For busways that pass through floors or firewalls, incorporate fire stops within the busway housings and external flanges to close the openings in the walls or floors adjacent to the busways. g. Install expansion fittings in the busway runs in compliance with the manufacturers standard recomme

22、ndations. h. The temperature rise at any point on the housing shall not exceed 30 C above an ambient temperature of 40 C. 9. Busway shall not be reduced in size at any point. C. Storage: All busway shall be stored at the job site as recommended in NEMA BU 1.1. D. Dimensions and Configurations: 1. Co

23、nfigure within the spaces designated for their installation. 2. Coordinate the routing of equipment installations by other trades to avoid conflicts. 3. Make final field measurements and check them with the shop drawings for the busways prior to authorization of fabrication of the busways. 2.2 PLUG-

24、IN BUSWAY A. Where required, busway shall be of the plug-in type. Plug-in busway shall be available in standard 2-, 4-, 6-, 8- and 10-foot lengths, with plug-in openings provided on both sides of the busway sections on 24-inch centers. Plug-in covers shall prohibit dirt and debris from entering cont

25、act plug-in openings in the busway. The contact surfaces for bus plug stabs shall be silver-plated and of the same material, thickness, and rating as the phase bars. A standard housing ground connection shall be supplied in each plug-in opening. B. Where required, plug-in units of the types and rati

26、ngs indicated on the plans and specifications shall be supplied. Plug-in units shall be mechanically interlocked with the busway housing to prevent their installation or removal while the switch is in the “ON” position. The enclosure of any plug-in unit shall make positive ground connection to the d

27、uct housing before the stabs make contact with the bus bars. All plug-in units shall be equipped with an interlock that can be defeated to prevent the cover from being opened while the switch is in the “ON” position and to prevent accidental closing of the switch while the cover is open. The plugs s

28、hall be provided with a means for padlocking the cover closed and padlocking the disconnect device in the “OFF” position. The operating handle and mechanism shall remain in control of the disconnect device at all times, permitting its easy operation from the Provided by IHSNot for ResaleNo reproduct

29、ion or networking permitted without license from IHS-,-,-4-09 26 25 11 - 5 floor by means of a hook stick or chain. All plug-in units shall be interchangeable without alteration or modification of plug-in duct. C. Fusible-type plugs shall have a quick-make/quick-break disconnect switch and positive

30、pressure fuse clips. D. Circuit breaker-type plugs shall have an interrupting rating of not less than _ symmetrical RMS amperes or be series-rated as otherwise shown in the contract documents and shall meet all requirements of UL Standard 489. All breaker plug-in devices shall be from the same manuf

31、acturer as the busway. PART 3 - EXECUTION 3.1 INSTALLATION A. Install busways as required by the NEC, UL, manufacturers recommendations. B. Support the busways as required by the NEC or as required by manufacturers shop drawings. Provide sufficient clearance for use of torque wrench at all connectio

32、ns. C. Install side bracing to prevent swaying or movement of the busways. /In seismic zones, bracing shall be installed as per details on structural drawings./ D. When the installations are complete, inspect the busway joints and eliminate any strains and stresses on the bus bars and housings. E. C

33、oordinate all of the busway terminations to equipment to insure proper phasing, connection and lugs. F. Tighten all of the bolt connections in the busways with a torque wrench as recommended by the manufacturer. G. Install expansion fittings at locations where bus assemblies cross building expansion

34、 joints. Install at other locations so distance between expansion fittings does not exceed manufacturers recommended distance between fittings. H. Construct rated fire-stop assemblies where bus assemblies penetrate fire-rated elements such as walls, floors, and ceilings. Seal around penetrations acc

35、ording to Section 07 84 00, PENETRATION FIRESTOPPING. I. Install weatherseal fittings and flanges where bus assemblies penetrate exterior elements such as walls or roofs. Seal around openings to make weathertight according to Section 07 92 00, JOINT SEALANTS. 3.2 ACCEPTANCE CHECKS AND TESTS A. Perfo

36、rm tests per NEMA BU 1.1 and as follows: 1. Compare equipment nameplate data with drawings and specifications. 2. Inspect physical and mechanical condition. 3. Inspect anchorage, alignment, and grounding. 4. Verify correct connection in accordance with single-line diagram. Provided by IHSNot for Res

37、aleNo reproduction or networking permitted without license from IHS-,-,-4-09 26 25 11 - 6 5. Verify tightness of accessible bolted electrical connections and bus joints by calibrated torque-wrench method in accordance with manufacturers published data. 6. Confirm physical orientation in accordance w

38、ith manufacturers labels to insure adequate cooling. 7. Examine outdoor busway for removal of “weep-hole” plugs, if applicable, and the correct installation of joint shield. 8. After installation but prior to energizing, busways shall be tested for continuity, phasing and insulation resistance. Insu

39、lation resistance shall be measured phase-to-phase and phase-to-ground with a 500 volt megger and values shall not be less than one megohm. 3.3 FOLLOW-UP VERIFICATION After the busways have been energized for not less than 30 days, repeat the torque wrench tightening of all bolt connections. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-