SECTION 16470 - PANELBOARDS PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. General: Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification sections, apply to work specified of this section. 1.02 DESCRIPTION A. Description: Provide panelboards with main breaker or main lugs where shown on the drawings, of a dead front, distributed phase sequence design. Panelboards shall be equipped with thermal-magnetic molded case circuit breakers with frame and trip ratings as indicated in the schedules. B. Manufacturers: Square-D, G.E. or Westinghosue. 1.03 QUALITY ASSURANCE A. ANSI: the latest edition of the Reference Standards for the American National Standards Institute shall apply as follows; 1. ANSI Y32.2 - Graphic Symbols for Electrical and Electronic Diagrams. 2. ANSI Z55.1 - (R1973) Gray finishes for Industrial Apparatus and Equipment. B. NEMA: National Electrical Manufacturers Association shall apply as follows; 1. NEMA PB1-1984 Panelboards 2. NEMA PB1-57 Gutter space C. NFPA: The latest edition of the National Fire Protection Association shall apply as follows; 1. NFPA 70, National Electrical Code (NEC). D. UL: The latest edition of the Underwriters' Laboratories, Incorporated shall apply as follows; 1. UL Electrical Construction Materials List, panelboards-dead front type. 2. UL 67 Panelboard wiring gutter space, bus heat rise test. 3. UL 50 Cabinets - Rigidity and gauge of steel. PANELBOARDS 16470-1
E. Listing: Panelboards shall be listed by Underwriters Laboratories and bear the UL or other nationally recognized testing laboratory label. Where required, panelboards shall be listed for use as service entrance equipment. 1.04 SUBMITTALS A. Shop drawings: 1. Product data shall be submitted on: a. Panel b. Cabinet c. Bus d. Construction e. Dimensions 2. Shop drawings shall be submitted for every panel, and shall clearly indicate all of the following information: a. U.L. Label b. Each circuit breaker amperage rating, circuit number and position/location in panel c. Electrical characteristics of panel d. Main bus rating e. Main device rating f. Mounting type g. Dimensions, (width, depth, height, weight) h. Bus material i. Interrupting capacity of minimum rated breaker j. Panelboard classification k. Submit coordination curves on log-log paper for all breakers, fuses, transformers, etc. l. If dimensions for equipment proposed in submitted shop drawings are different than was shown on drawings, contractor shall submit sketches showing layout of proposed equipment. PANELBOARDS 16470-2
1.05 OVERCURRENT PROTECTIVE DEVICES - DESCRIPTION A. Description of System: Connections of all items using electric power shall be included under this division of the specifications, including necessary wire, conduit, circuit protection, disconnects and accessories. Securing of roughing-in drawings and connection information for equipment involved shall also be included under this division. See other divisions for specifications for electrically operated equipment. Provide overcurrent protection for all wiring and equipment in accordance with the NEC, all federal, state and local codes as required and/or as shown on the drawings. 1.06 OVERCURRENT PROTECTIVE DEVICES - SUBMITTALS A. Shop drawings and product data: Shop drawings shall clearly indicate; 1. Frame sizes and interrupting capacity of all circuit breakers. 2. Horsepower ratings of rated voltage of fused switches and/or circuit breakers. 3. Size and type of fuses being provided. 4. Device is U.L. Listed, and bears the U.L. Label. 5. Device complies with these specifications, drawings, and applicable standards of NEMA, IEEE, ANSI, and ASA. PART 2 - PRODUCTS 2.01 PANELBOARDS A. Equipment: The panelboard bus assembly shall be enclosed in a steel cabinet and shall be surface or flush mounted as shown in the schedules. The box shall be fabricated from galvanized steel with standard baked enamel finish. Panelboard front shall include a door and shall have a flush, cylinder tumbler-type lock with catch and spring-loaded stainless steel door pull. All panelboard locks shall be keyed alike. All panel cabinets shall be a minimum of 20 inches wide. Fronts shall have adjustable indicating trim clamps which shall be completely concealed when the doors are closed. Doors shall be mounted with completely concealed steel hinges. Panel front shall not be removable with door in the locked position. PANELBOARDS 16470-3
B. Bus: Panelboard bus structure and main lugs or main circuit breaker shall have current ratings as shown on the panelboard schedule. Bus shall be insulated and bus bar connections to the branch circuit breakers shall be of the "distributed phase" or phase sequence type. All current carrying parts of the bus structure shall be tin plated copper. A full size insulated neutral bus bar shall be provided. Provide system grounding tin plated copper bus bar bonded to the panelboard cabinet for connection of system grounding conductors. This bar shall be mechanically and electrically isolated from the neutral bar except where panelboard is used as service entrance equipment. C. Molded Case Circuit Breakers: All panelboard branch circuit breakers shall be bolt-on thermal-magnetic molded case type. Breakers shall be 1, 2 or 3 pole with an integral crossbar to assure simultaneous opening of all poles in multi-pole circuit breakers. Breakers shall have an overcenter, trip-free, toggle-type operating mechanism with quick-make, quick-break action and active handle indication. Handles shall have "ON", "OFF", and "TRIPPED" positions. Bolt-on circuit breakers shall be able to be installed in the panelboard without requiring additional mounting hardware. D. Solid State Circuit Breakers: Provide solid state circuit breakers for all breakers 400 amperes and above. Breakers shall have adjustable settings for long time, short-time, instantaneous, long time delay and short time delay. E. 120/208 Rating: 120/208 volt circuit breakers shall have interrupting ratings a minimum of 10,000 rms symmetrical amperes at 240 volts AC maximum. F. 277/480 Rating: 277/480 volt circuit breakers shall have interrupting ratings a minimum of 65,000 rms symmetrical amperes minimum at 277 volts AC (single pole) or 480Y/277 volts AC 2 and 3 pole, unless otherwise noted. G. Switching Type: Single pole, 15 and 20 ampere circuit breakers intended to switch fluorescent lighting loads on a regular basis shall carry the SWD marking. H. Directories: A typed panelboard directory shall be provided for each panelboard and shall indicate the actual circuit number used, room name and type of load. Room names shall be the actual name or room number used not necessarily as shown on the drawing. Panel directories shall include all room numbers and names. Where panel schedules are indicated on the drawings as "receptacles or "lighting", etc., it shall be the responsibility of the Contractor to include the specific area served. PANELBOARDS 16470-4
I. Bracing: Panelboard as a complete unit shall be braced for a minimum short circuit rating equal to or greater than the lowest breaker symmetrical interrupting capacity as shown on the schedule. However, all panelboards shall be fully rated. No series ratings are allowed. J. Grounding: All panelboard cabinets shall have a system grounding bar bonded to the panelboard cabinet for connection of system grounding conductors. This bar shall be mechanically and electrically isolated from the neutral bar. K. Stubs: Provide six 3/4 inch conduits from all flush mounted panels to adjacent accessible ceiling space and mark "for future use". Provide pull cord in all empty conduits and provide plastic end bushing. L. Design Selection: 120/208V 480/277V Square "D", NQOD Westinghouse: Pow-R-Line 1 General Electric: A-Series Square "D", NEHB Westinghouse: Pow-R-Line 2 General Electric: A-Series 600A thru 1200A Square "D": I-Line Westinghouse: Pow-R-Line 4 General Electric: Spectra Series Square "D": I-line Westinghouse: Pow-R-Line 4 General Electric: Spectra Series PART 3 - EXECUTION 3.01 INSPECTION A. General: Examine area to receive panelboard and assure that there is adequate clearances to meet NEC requirements and normal maintenance issues. B. Correction: Start work only after any unsatisfactory conditions have been corrected. 3.02 INSTALLATION A. General: Provide panelboards in complete accordance with manufacturer's written instructions and all applicable codes. PANELBOARDS 16470-5
B. Support: Panelboards shall be rigidly supported and installed per manufacturers recommended supporting instructions, with beams provided if necessary, to suit actual site conditions. Panels shall not be directly mounted to masonry walls. Use kindorf or similar channel. C. Storage and Delivery: Panelboards shall be delivered to the site during that phase of panelboard installation in order to avoid storing panels on site where damage may occur. Replace any damaged parts prior to energizing panel. Cover panelboard to avoid damage to finish. D. Mounting: Do not mount equipment directly to masonry or concrete walls. Provide two uni-strut spacers between wall and panelboard. E. Operations and Maintenance Data: Manufacturer's instructions for tightening bus connections, cleaning, operation and maintenance. 3.03 QUALITY CONTROL A. General: Field test prior to energization; 1. Megger check, and record all data, of phase to phase and phase to ground insulation levels. 2. Continuity. 3.04 CHECK-OUT MEMO 3. Proper phase relationship. A. General: Submit check-out memo from panelboard representative. END OF SECTION 16470 PANELBOARDS 16470-6