OO-M-2829
200 kilowatts (kW) at 0.8 power factor, 60 Hertz (Hz), 460 volts (V). An
hourmeter capable of registering not less than 9,999 hours of engine operating
time shall be provided. Batteries furnished shall be dry charged in accordance
with W-B-131, without electrolyte, with sealed caps to prevent intrusion of
atmospheric moisture.
3.12.1.1 Electric motors. All electric motors shall be 3-phase, single
speed, induction type, and connected for 460V, alternating current (at), 60 Hz
operation. All motors shall be totally enclosed, nonventilated, or totally
enclosed fan-cooled machines conforming to NEMA MG-1. Motors shall be suitable
for the respective applications in an ambient temperature of 120°F (49°C). All
motors, 25 horsepower (hp) or 18.65 kW and larger, shall be arranged for
sequence starting from nonreversing reduced voltage or current motor starters.
The remaining motors may be across-the-line start with overload protection
controlled from the motor control center (see 3.12.1.2).
3.12.1.2 Motor controls. The motor controls shall be combination motor
control unit, rated for 460V, 3 phase, ac, conforming to NEMA ICS-1 and ICS-2,
in an ICS-6 type 4 enclosure. Provision shall be made for remote control
stations (start-stop pushbuttons), where required. All motor controllers,
components, and accessories shall be suitable for continuous operation under
conditions as follows:
a.
At ambient temperatures from +125°F (51.7°C) to +32°F (O°C) and at
any possible relative humidity.
b.
Exposure to severe dust conditions.
c.
Exposure to salt air.
d.
At any altitude from mean sea level (msl) to 5,000 feet (1524
meters (m)) above msl.
The motor controls shall have a manually operated main circuit breaker on the
incoming power supply to the control center. The main circuit breaker may be
either integral with the control center, or in a separate enclosure and shall
provide overload, ground fault, and short circuit protection. The main circuit
breaker shall have a shunt trip, with remote trip pushbutton(s) located at the
operator position(s), for emergency trip operation. The termination for the
incoming power supply to the main circuit breaker shall have screw pressure type
terminals for not less than three sets of power supply cables. One set of
terminals (one per phase) shall be suitable for terminating conductors from No.
4 American Wire Gage (AWG) to No. 1 AWG; the other terminals shall be suitable
for terminating conductors from 300,000 to 600,000 circular roils or 152 to 304
2
square millimeters (mm ). The plant control center shall have an instruction
plate permanently affixed in a conspicuous location. In addition to
instructions for connecting and operating the plant, the instruction plate shall
show the power supply requirements of the plant in bold type, as follows:
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