three-position selector switch marked MANUAL-OFF-AUTOMATIC.
b.
Connections to the selector switch shall only allow the normal
automatic regulatory control devices to be bypassed when the
switch is in the Manual position; all safety control devices, such
as low-or high-pressure cutouts, high-temperature cutouts, and
motor-overload protective devices, shall be connected in the
motor-control circuit in both the Manual and the Automatic
positions of the selector switch. Control circuit connections to
any MANUAL-OFF-AUTOMATIC switch or to more than one automatic
regulatory control device shall be made in accordance with wiring
diagram approved by the contracting Officer unless such diagram is
included on the drawings. All controls shall be 120 volts or less
unless otherwise indicated.
2.4.6
Motor Control Centers
Control centers shall be indoor type and shall contain combination starters
and other equipment as indicated. Control centers shall be NEMA ICS 2,
Class [_____], Type [_____]. Each control center shall be mounted on floor
sills or mounting channels. Each circuit shall have a suitable metal or
laminated plastic nameplate with white cut letters. Motor control centers
shall be provided with a full-length ground bus bar.
2.5
LOW-VOLTAGE FUSES
2.5.1
General
Low-voltage fuses shall conform to NEMA FU 1. Time delay and nontime delay
options shall be as [shown] [specified]. Equipment provided under this
contract shall be provided with a complete set of properly rated fuses when
the equipment manufacturer utilizes fuses in the manufacture of the
equipment, or if current-limiting fuses are required to be installed to
limit the ampere-interrupting capacity of circuit breakers or equipment to
less than the maximum available fault current at the location of the
equipment to be installed. Fuses shall have a voltage rating of not less
than the phase-to-phase circuit voltage, and shall have the time-current
characteristics requires for effective power system coordination.
2.5.2
Cartridge Fuses; Noncurrent-Limiting Type
Cartridge fuses of the noncurrent-limiting type shall be Class H,
nonrenewable, dual element, time lag type and shall have interrupting
capacity of 10,000 amperes. Class H Fuses shall conform to UL 198B. At
500 percent current, cartridge fuses shall not blow in less than 10
seconds. Cartridge fuses shall be used for circuits rated in excess of 30
amperes, 125 volts, except where current-limiting fuses are indicated.
2.5.3
Cartridge Fuses; Current-Limiting Type
**************************************************************************
NOTE: Class RKI provides high current limitation
with both time-delay and nontime-delay. RK5
provides moderate current limitation, time-delay
option.
**************************************************************************
Cartridge fuses, current-limiting type, Class [G] [J] [K] [L] [RK1] [RK5]
[RK9] [T] [CC] shall have tested interrupting capacity not less than
SECTION 16475A
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