OO-M-2829
3.12.1.3 Motor controllers. Motor controllers (starter) shall be ac general
purpose, class A, magnetic controllers for single speed, nonreversing,
nonjogging, squirrel-cage induction motors, conforming to NEMA ICS-2.
Controllers for motors of 25 hp (18.65 kW) and larger shall be reduced voltage
or current motor controls. Controllers for motors of less than 25 hp (18.65 kW)
may be full-voltage (across-the-line) controllers. Insofar as consistent with
plans operation, the controllers shall be interlocked to provide sequence
starting, with the larger motors to be started first, in order to reduce the
required power input capacity to a minimum. The starting sequence shall be
included in the connecting and operating instructions.
3.12.1.4 Power and control cables. All power, control and grounding cables,
fittings, and accessories required to completely connect the plant for operation
shall be furnished in the length required for each circuit. In addition, three
sets of power cables (one three-conductor cable or three one-conductor cables
each) nor less than 100 feet (30 m) in length shall be furnished to connect the
motor control center to the incoming power supply source. One set of power
supply cables shall have adequate load capacity to supply the standby loads,
such as the hot oil heating system, and asphalt storage transfer pumps, but the
individual conductors shall be not smaller than No. 4 AWG. The other sets of
power supply cables shall have adequate load capacity to supply the maximum
power input required to operate the complete plant, but all the individual
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conductors shall be not smaller than 400,000 circular mils (203 MM ) copper.
All power and control cables, for the power supply and for interconnecting the
plant, shall be heavy-duty portable cables, conforming to NEMA WC7. All
portable cables shall be raced for conductor operating temperature of not less
than 167°F (75°C). The load on any conductor shall not exceed the allowable
ampacities of NFPA 70. The grounding system for the complete plant shall
include the grounding conductors, fittings, ground rods, and clamps. The
grounding conductors shall be of suitable size and type for the application.
3.13 Drive components.
3.13.1 V-belt drives, V-belt drives shall be in accordance with ANSI B15.1
and shall have provisions for adjustment.
All chains, gears, and bearings shall
3.13.2 Chains, gears, and bearings.
have provisions for lubrication. Bearings shall be lubricated antifriction type
with dust shield provisions.
3.14 Cold-aggregate feeder(s). The cold-aggregate feeder(s) shall be of
hopper and frame construction and shall consist of a two-bin aggregate hopper.
Belt-conveyor feeder(s), all supported by a rigid steel frame and mounted on a
pneumatic-tired semitrailer chassis. The cold-aggregate feeder(s) shall
discharge the materials into the cold-aggregate conveyor.
3.14.1 Hoppers. The two-bin aggregate hopper shall be of welded steel
construction. The bin side plates and divider plates shall have a wide opening
for receiving the amount of aggregate being dumped into each hopper. Hopper and
bin extensions shall be provided for each hopper. Bins and bin extensions shall
be provided with reinforcing to prevent damage to the edges while bins are being
charged. Each bin shall be provided with an individual; adjustable, control
gate, or by other suitable means, to regulate the flow of aggregate. The gate
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