Download SECTION 16503

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.
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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.
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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.
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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***
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December 2004