16470 PANELBOARDS ************************************************************************************************************* SPECIFIER: CSI MasterFormat 2004 number: 26 24 16 An optional keynote to the Drawings follows major product titles, for A/Es using National CAD Standard. ************************************************************************************************************* PART 1 GENERAL 1.1 SUMMARY A. Provide a complete Distribution Panelboard system as indicated on the drawings, and as specified herein. B. All materials shall be listed by an OSHA approved Nationally Recognized Testing Laboratory (NRTL). C. Related Sections: 1. 09900 - Painting. 2. 16120 - Wire and Cable. 3. 16475 - Overcurrent Protective Devices. 1.2 SYSTEM DESCRIPTION A. Panelboards used as service entrance equipment shall be NRTL labeled as service entrance equipment. 1.3 SUBMITTALS A. Submit shop drawings, manufacturer's literature, and technical data before starting work. B. All switchboards and panelboards submitted shall be designed and manufactured according to the latest revisions of the following specifications: 1. UL 50, UL 67, UL 89, Ul489, Ul 891, UL 1283, UL 1449 2. Nema AB-1, PB1, PB1.1, PB2, PB2.1 PB 2.2 3. NFPA 70 4. Federal Specifications: W-C-375B, W-P-115C PART 2 PRODUCTS 2.1 MANUFACTURERS A. Panelboards: 1. General Electric. 2. Siemens. 3. Square D. Project No. SPECIFICATION GUIDELINES 16470-1
4. Eaton Corp. 2.2 EQUIPMENT A. Distribution and Power Panelboards: 1. Interior: Provide fully rated plated copper bus. Plating shall run the entire length of the bus bar. Solid neutral and ground bar shall be copper. Maximum rating: 1200 amp. 2. Main breaker shall be horizontally mounted. Main breakers shall have conspicuous marking labels. 3. Trims shall have door with keyed lock. All locks shall be keyed the same. 4. Provide directory holder and typed directory for all circuits. 5. Enclosure shall be galvanized galvaneal steel constructed in accordance with UL50 and NEMA 250. Box end walls shall be blank. 6. Short circuit current ratings shall be equal to or greater than available fault current at point of application. NRTL listed series ratings may be utilized, where not in violation of NEC 240.86. Provide documentation of NRTL listed series rating used. 7. Surge Protective Devices (SPD) shall be provided when specified in the design and associated electrical plans, with optional peak surge current of 260kA. 8. Distribution panels for use at 120/208 volts shall ne NRTL listed with minimum integrated assembly rating of 22K AIC. 9. Distribution panelboards, 400 amperes and over, shall be provided with molded case circuit breakers tested and labeled according to UL 489. B. Lighting, Receptacle and Power Panelboards 1. Interior: Provide fully rated plated copper bus. Plating shall run the entire length of the bus bar. Solid neutral and ground bar to be copper. Maximum rating: 600amp. 2. Main breaker shall be vertically or horizontally located and have conspicuous marking labels. 3. Trims shall have door with keyed lock. All locks to be keyed the same. Provide trims with concealed door hinges and trim screws for panels 600 amps or less. 4. Provide directory holder and typed directory for all circuits. 5. Enclosure shall be galvanized steel constructed in accordance with UL50. Box endwalls shall be blank. 6. Short circuit current ratings shall be equal to or greater than available fault current at point of application. NRTL listed series ratings may be utilized, where not in violation of NEC 240.86. Provide documentation of NRTL listed series rating used. 7. Provide SPD s when specified in the design and associated electrical plans, with optional peak surge current of 100kA. 8. Minimum rating of breakers shall be as follows: a. Lighting and power panels for use at 120/208 volts: 225 amp maximum with circuit breakers rated at 10K AIC symmetrical at 240 volts. b. Lighting and power panels for use at 480/277 volts: 225 amp maximum with circuit breakers rated at 14K AIC symmetrical at 480 volts. 9. Interiors shall be factory assembled and designed to allow switching and protective devices to be replaced without disturbing adjacent units, without removing the main bus connectors, and allowing circuits to change without machining, drilling or tapping. Project No. SPECIFICATION GUIDELINES 16470-2
10. Branch circuits shall be arranged using double row construction unless narrow column panels are indicated. A nameplate shall be provided listing panel type and ratings. Circuit breakers shall be bolt-on type. 11. Unless otherwise noted, full size insulated neutral bars shall be included. Bus bar taps for panels with single pole branches shall be arranged for sequence phasing of the branch circuit devices. Neutral bussing shall have a suitable lug for each outgoing feeder requiring a neutral connection. A ground bus shall be provided in all panels. C. Boxes and Trims shall meet the following criteria: 1. Boxes shall be at least 20 inches wide made from code gage galvanized sheet steel. a. Provide minimum gutter space according to NEC requirements. b. Where feeder cables supplying the mains of a panel are carried through its box to supply other electrical equipment, the box shall be sized to include the additional required wiring space. c. At least 4 interior mounting studs with adjustable nuts shall be provided. 2. Switching device handles shall be accessible. a. Doors and panelboard trims shall not uncover any live parts. b. Doors shall have flush chrome plated handle with cylinder lock and catch, except doors over 48 inches in height shall have auxiliary fasteners top and bottom of door in addition to the flush type cylinder lock and catch. c. Panelboard switching devices with individual dead front doors shall be acceptable instead of standard door in trim design. d. Panelboard trim clamps shall be of the indicating type. 3. Exterior and interior steel surfaces of the trim shall be properly cleaned, primed with rust inhibiting phosphatic coating, and finished with manufacturer's standard gray paint. a. Trims for flush panels shall overlap the box for at least 3/4" all around. b. Surface trims shall have the same width and height as the box. c. Trims shall be mountable by a screwdriver without the need for special tools. d. After installation, trim clamps shall not be accessible when the panel door is closed and locked. 4. Panelboards exposed to the weather shall have NEMA type 3R raintight enclosure or NEMA 4X in corrosive environments. D. Electrical Components: 1. Main bus bars shall be fully rated copper bus bars, with plating shall running the entire length of the bus bar, and shall be sized according to NRTL standards to limit the temperature rise on any current carrying part to a maximum of 50 degrees C. above an ambient of 40 degrees C. maximum. Provide main circuit breakers, main lugs, or sub-feed lugs as required. 2. Each panelboard shall incorporate breakers as shown with AIC or higher, at the application voltage, than the available fault at its location along the electrical Project No. SPECIFICATION GUIDELINES 16470-3
distribution system, as determined by the short circuit study. Minimum rating of breakers shall be: a. Lighting and power panels for use at 120/208 volts: 225 amp maximum with circuit breakers rated at 10K AIC symmetrical at 240 volts. b. Lighting and power panels for use at 480/277 volts: 225 amp maximum with circuit breakers rated at 14K AIC symmetrical at 480 volts. c. Distribution panels for use at 120/208 volts: UL listed with minimum integrated assembly rating of 22K AIC. 3. Panels tested and listed according to UL 67 and bearing an integrated short circuit rating shall be determined by the short circuit study on the electrical system with 10,000 AIC minimum. 4. Any 2 single pole circuit breakers shall be replaceable by 1 two-pole circuit breaker and any 3 single-pole breakers shall be replaceable by 1 three-pole circuit breaker. 5. Where new circuit breakers are specified to be installed within existing panelboards, they shall be compatible in terms of manufacture, type, and AIC. 6. Breakers 100 ampere through 400 ampere frame sizes shall be thermal-magnetic trip with inverse time current characteristics, unless otherwise noted. 7. Provide ground fault circuit interrupter circuit breakers where indicated. 8. Emergency Panelboards Identification: Paint door red and stencil in 1 inch high yellow letters "EMERGENCY PANEL" in addition to appropriate individual panel identification as shown on drawings. PART 3 EXECUTION 3.1 INSPECTION A. Do not proceed with the work of this section until conditions detrimental to the proper and timely completion of the work have been corrected in an acceptable manner. 3.2 INSTALLATION A. Panelboards shall be installed where indicated and with top of cabinet 6'-6" above floor, and shall be rigidly and securely attached to building construction and shall not depend upon conduit for support. Allow at least 1/2" air space behind wall mounted panelboards. B. Install panelboards according to manufacturer's recommended data. Maintain clearances required by the National Electrical Code, with particular attention to working space around panelboards. Maintain clear space above panelboards, coordinate with other trades to avoid placement of panelboards below piping, ductwork, or other foreign appurtenances. Relocate panels at no additional cost should such interferences occur. C. Supply panelboards with phenolic nameplate 1 inch x 3 inch on exterior of panels and engraved with panel designation and voltage rating. Lighting and power panelboards shall be provided with a clear plastic enclosed typewritten directory inside. Circuit identification shall include load type (lighting, receptacles, etc.) and rooms served. D. Where flush type panelboards are indicated, provide one 3/4" empty conduit terminated in accessible ceiling above for each 3 spare circuit breakers provided in the panelboard. Project No. SPECIFICATION GUIDELINES 16470-4
E. Install circuit breakers in existing panelboards according to manufacturer's recommendation. Verify tightness of connections including mains. Identify new circuits on the panel directory. If none exists, provide one. F. Clean and touch up panelboard as required at completion of the project. G. Support surface mounted panelboards for other than masonry walls, from floor slab secured "Kindorf" or "Unistrut" channels. Mount those installed on masonry walls to back boards secured to walls, and according to manufacturer s recommendations and applicable codes and regulations. Contractor shall coordinate manufacturer s actual panelboard dimensions with room clearances to conform with NEC requirements. END OF SECTION Project No. SPECIFICATION GUIDELINES 16470-5