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SECTION 16503 LIGHTING PANELBOARDS 503.01 GENERAL A. Manufacturer 1. B. Lighting panelboards shall be as manufactured by Square D and shall have a main circuit breaker having 3 phase integral ground fault protection, as herein described. Identification Each panelboard shall be provided with one (1) engraved, black-whiteblack phenolic nameplate; size 2" x 3"; marked with the panelboard designation, voltage, amperage, and short circuit rating in 3/8" high letters, as specified on the drawings. 503.02 277/480-VOLT PANELBOARDS A. 16503-rev0 Description 1. Lighting panelboards shall be dedicated for lighting circuits only. 2. Lighting panelboards shall be dead front, door-in-door type; with recessed, surface, or column mounted steel cabinets, as called for on the drawings; and an internal assembly of circuit breakers. Trims shall have hinged and locked doors, with glass or heavy plastic covered circuit directories. All locks shall be keyed alike. 3. Panelboards shall be rated at 277/480-Volt, 3-phase, 4-wire, solid neutral, with a full length main bus structure and main GFI type circuit breaker. 4. Main bus shall be 225 amperes. Panelboard bus shall be solid copper of 98% conductivity composition. 5. Branch circuit breakers shall be molded plastic, case-type, single pole, 20 ampere, quick-make, quick-break, with trip free operating handle, position indication, and thermal-magnetic trip device. Minimum frame size shall be 100 amperes and minimum interrupting capacity shall be 14,000 RMS symmetrical amperes at 277 volts. 6. Panelboards shall be provided with a listed grounding bus attached to the enclosure, but isolated from the neutral bus. The bus shall be of sufficient size to terminate the incoming grounding conductor and all branch circuit grounding conductors. 7. Branch circuit breakers used for switching shall comply with NEC 240-83(d) circuit breakers used as switches. 16503 - 1 December 2004 SECTION 16503 LIGHTING PANELBOARDS 503.03 8. Ground fault trip setting shall have a time setting from 3 1/2 to 30 cycles. 9. Engineering to perform a coordination study, to coordinate the ground fault current, such that in the event of a ground fault the fault does not trip the circuit breaker feeding the panelboard. 120/208 VOLT PANELBOARDS A. B. Description 1. Lighting panelboards shall be dead front, door-in-door type; with recessed, surface, or column mounted steel cabinets, as called for on the drawings; and an internal assembly of circuit breakers. Trims shall have hinged and locked doors, with glass or heavy plastic covered circuit directories. All locks shall be keyed alike. 2. Panelboards shall be rated at 120/208-Volt, 3-phase, 4-wire solid neutral, with a full length main bus structure and main circuit breaker. 3. Main bus shall be 225 amperes. Panelboard bus shall be solid copper of 98% conductivity composition. 4. Branch circuit breakers shall be molded plastic, case-type, single pole, 20 ampere, quick-make, quick-break, with trip free operating handle, position indication, and thermal-magnetic trip device. Minimum frame size shall be 100 amperes and minimum interrupting capacity shall be 10,000 RMS symmetrical amperes at 120 or 208 Volts. 5. Panelboards shall be provided with a listed grounding bus attached to the enclosure, but isolated from the neutral bus. The bus shall be of sufficient size to terminate the incoming grounding conductor and all branch circuit grounding conductors. Circuiting (All Panels) 1. Panelboard circuit numbers, shown on the drawings, are for identification. These numbers may be changed, with approval of HGST’s Engineer, to obtain the most economical grouping or to balance the load. If the Contractor changes any branch circuit number, he shall furnish the Engineer one (1) set of prints showing all changes in numbering and panel schedules before final acceptance of work. Each circuit breaker shall be permanently numbered to correspond with the circuit directory. 16503-rev0 16503 - 2 December 2004 SECTION 16503 LIGHTING PANELBOARDS Circuit breakers used for switching shall comply with NEC 24083(d), circuit breakers used as switches. Lighting circuits shall be leap frogged whenever possible 2. Neutrals shall be by group only, i.e., 01,03-05 N or 02, 04, 06 N if in same conduit. If breakers selected are 01, 02, then two (2) neutrals are required. 3. A panel schedule shall be mounted in each panelboard. HGST panel schedule form shall be used (see SE-45). 4. Panelboard installation shall include working clearance per current NEC Table 110-16(a). 5. Main circuit breakers shall be Square D with solid state trip. ***END OF SECTION 16503*** 16503-rev0 16503 - 3 December 2004