VA 26 24 16-2010 PANELBOARDS.pdf

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1、09-10 26 24 16 - 1 SECTION 26 24 16 PANELBOARDS SPEC WRITER NOTE: Delete between / - / if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION This section specifies the furnishing, installation

2、, and connection of panelboards. 1.2 RELATED WORK A. Section 09 91 00, PAINTING: Identification and painting of panelboards. /B. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Requirements for seismic restraint of non-structural components./ C. Section 26 05 11, REQU

3、IREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one Section of Division 26. D. Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW): Cables and wiring. E. Section 26 05 26, GROUNDING AND BONDING FOR E

4、LECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path for possible ground fault currents. F. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS: Conduits and outlet boxes. /G. Section 26 05 71, ELECTRICAL SYSTEM PROTECTIVE DEVICE STUDY: Requirements for ins

5、talling the over-current protective devices to ensure proper equipment and personnel protection./ H. Section 26 09 23, LIGHTING CONTROLS: Lighting controls integral to panelboards. I. Section 26 43 13, TRANSIENT-VOLTAGE SURGE SUPPRESSION: Surge suppressors installed in panelboards. 1.3 QUALITY ASSUR

6、ANCE 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 INSTALLATIONS. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from

7、IHS-,-,-09-10 26 24 16 - 2 B. Shop Drawings: 1. Sufficient information, shall be clearly presented to determine compliance with drawings and specifications. 2. Include electrical ratings, dimensions, mounting details, materials, wiring diagrams, accessories, and weights of equipment. Complete namepl

8、ate data, including manufacturers name and catalog number. C. Manuals: 1. When submitting the shop drawings, submit companion copies of complete maintenance and operating manuals, including technical data sheets and wiring diagrams. 2. If changes have been made to the maintenance and operating manua

9、ls that were originally submitted, then submit four copies of updated maintenance and operating manuals to the /Resident Engineer/ /COTR/ two weeks prior to final inspection. D. Certification: Two weeks prior to final inspection, submit four copies of the following to the /Resident Engineer/ /COTR/:

10、 1. Certification by the manufacturer that the materials conform to the requirements of the drawings and specifications. 2. Certification by the contractor that the materials have been properly installed, connected, and tested. 1.5 APPLICABLE PUBLICATIONS A. Publications listed below (including amen

11、dments, 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. National Electrical Manufacturers Association (NEMA): PB-1-06 Panelboards 250-08 . Enclosures for Electrical Equipment (100

12、0V Maximum) C. National Fire Protection Association (NFPA): 70-2005 . National Electrical Code (NEC) 70E-2004 . Standard for Electrical Life Safety in the Workplace D. Underwriters Laboratories, Inc. (UL): 50-95 Enclosures for Electrical Equipment 67-09 Panelboards 489-09 . Molded Case Circuit Break

13、ers and Circuit Breaker Enclosures Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 24 16 - 3 PART 2 - PRODUCTS 2.1 PANELBOARDS A. Panelboards shall be in accordance with UL, NEMA, NEC, and as shown on the drawings. B. Panelboards shall be st

14、andard manufactured products. C. All panelboards shall be hinged “door in door” type with: 1. Interior hinged door with hand-operated latch or latches, as required to provide access only to circuit breaker operating handles, not to energized parts. 2. Outer hinged door shall be securely mounted to t

15、he panelboard box with factory bolts, screws, clips, or other fasteners, requiring a tool for entry. Hand-operated latches are not acceptable. 3. Push inner and outer doors shall open left to right. SPEC WRITER NOTE: Show on the drawings the information necessary to specify accessories and interconn

16、ection to other systems. D. All panelboards shall be completely factory-assembled with molded case circuit breakers and integral accessories, such as surge protective devices per Section 26 43 13, TRANSIENT-VOLTAGE SURGE SUPPRESSION, metering devices per Section 25 10 10, ADVANCED UTILITY METERING,

17、lighting controls per Section 26 09 23, LIGHTING CONTROLS, and as scheduled on the drawings or specified herein. Include one-piece removable, inner dead front cover, independent of the panelboard cover. SPEC WRITER NOTE: Show on the drawings the information required in the paragraph below. E. Panelb

18、oards shall have main breaker or main lugs, bus size, voltage, phase, top or bottom feed, and flush or surface mounting as scheduled on the drawings. F. Panelboards shall conform to NEMA PB-1, NEMA AB-1, and UL 67 and have the following features: 1. Non-reduced size copper bus bars with current rati

19、ngs as shown on the panel schedules, rigidly supported on molded insulators. 2. Bus bar connections to the branch circuit breakers shall be the “distributed phase” or “phase sequence” type. 3. Mechanical lugs furnished with panelboards shall be cast, stamped, or machined metal alloys of sizes suitab

20、le for the conductors to which they will be connected. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 24 16 - 4 4. Neutral bus shall be /100%/200%/rated, mounted on insulated supports. 5. Grounding bus bar shall be equipped with screws or l

21、ugs for the connection of grounding wires. 6. Buses shall be braced for the available short-circuit current. Bracing shall not be less than 10,000 A symmetrical for 120/208 V and 120/240 V panelboards, and 14,000 A symmetrical for 277/480 V panelboards. 7. Branch circuit panelboards shall have buses

22、 fabricated for bolt-on type circuit breakers. 8. Protective devices shall be designed so that they can easily be replaced. 9. Where designated on panel schedule “spaces,“ include all necessary bussing, device support, and connections. Provide blank cover for each space. 10. In two section panelboar

23、ds, the main bus in each section shall be full size. The first section shall be furnished with subfeed lugs on the line side of main lugs only, or through-feed lugs for main breaker type panelboards, and have cable connections to the second section. Panelboard sections with tapped bus or crossover b

24、us are not acceptable. 11. Series-rated panelboards are not permitted. 2.2 CABINETS AND TRIMS Cabinets: 1. Provide galvanized steel cabinets to house panelboards. Cabinets for outdoor panelboards shall be factory primed and suitably treated with a corrosion-resisting paint finish meeting UL 50 and U

25、L 67. 2. Cabinet enclosure shall not have ventilating openings. 3. Cabinets for panelboards may be of one-piece formed steel or of formed sheet steel with end and side panels welded, riveted, or bolted as required. SPEC WRITER NOTE: Show the breaker ratings, including interrupting ratings, on the dr

26、awings. 2.3 MOLDED CASE CIRCUIT BREAKERS FOR PANELBOARDS A. Circuit breakers shall be per UL 489, in accordance with the NEC, as shown on the drawings, and as specified. B. Circuit breakers in panelboards shall be bolt-on type. Provided by IHSNot for ResaleNo reproduction or networking permitted wit

27、hout license from IHS-,-,-09-10 26 24 16 - 5 C. Molded case circuit breakers shall have minimum interrupting rating as required to withstand the available fault current, but not less than: 1. 120/208 V Panelboard: 10,000 A symmetrical. 2. 120/240 V Panelboard: 10,000 A symmetrical. 3. 277/480 V Pane

28、lboard: 14,000 A symmetrical. SPEC WRITER NOTE: Edit the paragraph below to conform to project requirements. D. Molded case circuit breakers shall have automatic, trip free, non-adjustable, inverse time, and instantaneous magnetic trips for 100 A frame or lower. Magnetic trip shall be adjustable fro

29、m 3x to 10x for breakers with 600 A frames and higher. /Breaker trip setting shall be set in the field, based on the approved protective device study as specified in Section 26 05 71, ELECTRICAL SYSTEM PROTECTIVE DEVICE STUDY / / Factory setting shall be HI, unless otherwise noted /. E. Breaker feat

30、ures shall be as follows: 1. A rugged, integral housing of molded insulating material. 2. Silver alloy contacts. 3. Arc quenchers and phase barriers for each pole. 4. Quick-make, quick-break, operating mechanisms. 5. A trip element for each pole, thermal magnetic type with long time delay and instan

31、taneous characteristics, a common trip bar for all poles and a single operator. 6. Electrically and mechanically trip free. SPEC WRITER NOTE: Edit the paragraph below to conform to project requirements. 7. An operating handle which indicates ON, TRIPPED, and OFF positions. 8. An overload on one pole

32、 of a multipole breaker shall automatically cause all the poles of the breaker to open. 9. Ground fault current interrupting breakers, shunt trip breakers, lighting control breakers (including accessories to switch line currents), or other accessory devices or functions shall be provided where indic

33、ated. SPEC WRITER NOTE: Delete the paragraph below if not required by the project. /10. For circuit breakers being added to existing panelboards, coordinate the breaker type with existing panelboards. Modify the panel directory accordingly./ Provided by IHSNot for ResaleNo reproduction or networking

34、 permitted without license from IHS-,-,-09-10 26 24 16 - 6 2.4 SURGE SUPPRESSION Where shown on drawings, furnish panelboard with integral transient voltage surge suppression device. Refer to Section 26 43 13, TRANSIENT-VOLTAGE SURGE SUPPRESSION. 2.5 SEPARATELY ENCLOSED MOLDED CASE CIRCUIT BREAKERS

35、A. Where separately enclosed molded case circuit breakers are shown on the drawings, provide circuit breakers in accordance with the applicable requirements of those specified for panelboards. B. Enclosures are to be of the NEMA types shown on the drawings. Where the types are not shown, they are to

36、 be the NEMA type most suitable for the environmental conditions where the circuit breakers are being installed. PART 3 - EXECUTION 3.1 INSTALLATION A. Installation shall be in accordance with the manufacturers instructions, the NEC, as shown on the drawings, and as specified. B. Locate panelboards

37、so that the present and future conduits can be conveniently connected. C. Install a printed schedule of circuits in each panelboard after approval by the /Resident Engineer/ /COTR/. Schedules shall be printed on the panelboard directory cards, installed in the appropriate panelboards, and incorporat

38、e all applicable contract changes. Information shall indicate outlets, lights, devices, or other equipment controlled by each circuit, and the final room numbers served by each circuit. D. Mount the fully-aligned panelboard such that the maximum height of the top circuit breaker above the finished f

39、loor shall not exceed 78 in 1980 mm. Mount panelboards that are too high such that the bottom of the cabinets will not be less than 6 in 150 mm above the finished floor. SPEC WRITER NOTE: Delete the paragraph below if not required by the project. /E. For panelboards located in areas accessible to th

40、e public, paint the exposed surfaces of the trims, doors, and boxes with finishes to match surrounding surfaces after the panelboards have been installed./ F. Rust and scale shall be removed from the inside of existing backboxes where new panelboards are to be installed. Paint inside of backboxes wi

41、th rust-preventive paint before the new panelboard interior is Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 24 16 - 7 installed. Provide new trim and doors for these panelboards. Covers shall fit tight to the box with no gaps between the

42、cover and the box. 3.2 ACCEPTANCE CHECKS AND TESTS Perform in accordance with the manufacturers recommendations. Include the following visual and mechanical inspections and electrical tests: 1. Visual and Mechanical Inspection a. Compare equipment nameplate data with specifications and approved shop

43、 drawings. b. Inspect physical, electrical, and mechanical condition. c. Verify appropriate anchorage and required area clearances. d. Verify that circuit breaker sizes and types correspond to approved shop drawings. e. To verify tightness of accessible bolted electrical connections, use the calibra

44、ted torque-wrench method or perform thermographic survey after energization. f. Clean panelboard. 3.3 FOLLOW-UP VERIFICATION Upon completion of acceptance checks, settings, and tests, the contractor shall demonstrate that the panelboards are in good operating condition and properly performing the intended function. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-