Specifications - State of Delaware

SECTION 262416 - PANELBOARDS: continued
Provide enclosures which are fabricated by the same manufacturer as panelboards, and which
mate and match properly with panelboards. Provide panelboards with UL markings which
indicate "suitable for use as service entrance equipment."
C. Power Distribution Panelboards: Dead-front, safety type, power distribution panelboards as
indicated with panelboard switching and protective devices in quantities, ratings, types, and
with arrangement shown; with anti-turn solderless pressure type main lug connectors approved
for use with copper conductors. Provide unit with incoming feeder connecting at top or bottom
of panel as required. Provide 480Y/277V, 3-phase, 4-wire, 60 hertz panelboard with full-sized
neutral bus; provide suitable lugs on neutral bus for incoming and outgoing feeders requiring
neutral connections. Provide bolt-on, molded-case, main and branch circuit breaker types for
each circuit with toggle handles that indicate when tripped. Where multiple-pole breakers are
indicated, provide with common trip so overload on one pole will trip all poles simultaneously.
Provide panelboard with bare uninsulated grounding bars suitable for bolting to enclosures.
Provide enclosures fabricated by same manufacturer as panelboards which mate and match
properly with panelboards.
D. Lighting and Small Power Panelboards: Dead-front, safety type, 480Y/277V; 208Y/120V
(voltage rating as required), 3-phase, 4-wire, 60 hertz; 200Y/115Vac, 400 hertz; and 28Vdc
lighting and small power panelboards as indicated, with switching and protective devices in
quantities, ratings, types, and arrangements shown; with anti-turn solderless pressure type lug
connectors approved for use with copper conductors; construct unit for connecting incoming
feeder at top or bottom of panel as required; Equip with full-sized neutral bar, with bolt-on
type, heavy-duty, quick-make, quick-break, single- and multi-pole circuit breakers, with toggle
handles that indicate when tripped. Where multiple-pole breakers are indicated, provide
common trip for all poles. Provide suitable lugs on neutral bus for each incoming and
outgoing feeder required; and provide bare uninsulated grounding bars suitable for bolting to
enclosures. Provide insulated ground bus for isolated ground circuits that terminate or pass
through the panelboard, as indicated. Provide enclosures fabricated by same manufacturer as
panelboards, which mate and match properly with panelboards. Provide double neutral where
indicated.
E. Panelboard Enclosures: Galvanized sheet steel cabinet type enclosures, in sizes required,
NEMA Type 1 (unless indicated or specified otherwise) and code gauge (minimum 16-gage)
thickness. Construct with multiple knockouts and wiring gutters. Provide fronts with
adjustable trim clamps and front doors with flush locks and three keys per panelboard, all
panelboard enclosures keyed alike, with concealed piano front door hinges. Provide hinged
doors over vertical wiring gutter. Equip with interior circuit directory frame and removable
card with clear plastic covering. Provide baked gray enamel finish over a rust inhibitor
coating. Design enclosures for recessed or surface mounting as indicated. Provide enclosures
which are fabricated by same manufacturer as panelboards, which mate and match properly
with panelboards to be enclosed.
F. Molded-Case Circuit Breakers: Circuit breakers shall be manufactured by the panelboard
manufacturer and shall be UL-listed to be installed in the panelboard. Factory-assembled, bolton,
molded-case circuit breakers of frame sizes, characteristics, voltage, poles, RMS
symmetrical interrupting ratings indicated and other ratings indicated. The minimum
interrupting rating for 120Vac, 208Vac and 240Vac circuit breakers shall be 10,000 amperes,
RMS symmetrical unless indicated otherwise. The minimum interrupting rating for 277Vac,
480Vac and 600Vac circuit breakers shall be 14,000 amperes RMS symmetrical, unless
indicated otherwise. All circuit breakers applied at 480Vac shall be rated 480Vac. All circuit
breakers applied at 208 or 240Vac shall be rated 240Vac. Provide integral ground fault
protection on all 480V service entrance main circuit breakers and all 480V feeder circuit
DEAN262416.DOC 262416-3