MIL-DTL-16036M(SH)
3.4.4 Load center (see 6.3.5) distribution sections. These sections shall be switchgear unit type of construction.
Units comprising the section shall provide for distribution through Type ACB or AQB circuit breakers and shall be
constructed in accordance with 3.4.1.6 through 3.4.1.9. Distribution units requiring two sources of supply shall be
provided with interlocked NQB, AQB, or ACB circuit breakers. Where interlocked circuit breakers are installed, an
indicator light shall be provided for each power supply to indicate when power is available.
3.4.4.1 Circuit breakers. Each load center distribution section shall be provided with two Type AQB-A or
AQB-LF 250-ampere frame size circuit breakers for casualty power supply and two casualty power terminals back-
connected type conforming to MIL-DTL-24552 and MIL-DTL-24552/1, connected through the Type AQB circuit
breakers to the main bus.
3.4.5 Ship s service power switchgear group for DC ships.
3.4.5.1 DC generator control unit. Generator control unit shall contain the following:
a.
One circuit breaker.
b.
One DC voltmeter and switch for reading bus and generator voltage.
c.
One DC ammeter with shunt for reading generator current.
d.
One indicator light (blue) to show the closed position of the generator circuit breaker.
e. One set of two ground detector lights (clear) and one control switch for indication of ground conditions on
DC bus or its connected feeders.
f. Space, mounting, and wiring for the generator field rheostat and operating mechanism to be furnished with
the generator.
g. One reverse current relay to prevent the generator from motoring on the bus after loss of driving power
from the prime mover (only when more than one generator is connected to the DC bus).
Lower section of the unit may be used for the mounting of distribution switches or circuit breakers where the
utilization of this space will result in a saving in the overall size of the switchboard.
3.4.5.2 DC bus tie unit. The following shall be mounted within the unit:
a.
One circuit breaker.
b.
Necessary disconnecting devices for performing switching functions, as may be required.
c. Dead-front fuse panel for fusing control circuits. Dead-front fuseholders shall be of the type listed in
3.14.2.1 in accordance with MIL-PRF-19207.
d.
Shunt for bus tie ammeter (in positive bus only).
3.4.5.2.1 Front panel. The following shall be mounted on the front panel of the bus tie unit:
a.
One indicator light (blue) to indicate the closed position of the bus tie circuit breaker.
b. One ammeter with zero center scale for indicating current flow in the bus tie. The ammeter shall be
connected to read to the right for current flowing from the bus to the bus tie.
c.
Voltmeter with transfer switch for reading the voltage of the switchboard bus and of the bus tie.
Lower section of the unit may be used for the mounting of distribution switches or circuit breakers where the
utilization of this space will result in a saving in the overall size of the switchboard.
3.4.5.2.2 Bus tie and shore power unit. Bus tie unit of the switchgear group containing the shore power
connection shall be designated as a "bus tie and shore power unit". In addition to the equipment specified in 3.4.5.2
and 3.4.5.2.1, this unit shall have the following:
a. One shore power connection circuit breaker. The shore power circuit shall be connected to the bus tie
circuit so that the power may be fed to either the local or remote switchboard through a bus tie circuit breaker. The
ammeter shunt [see 3.4.5.2 (d)] shall be so located that it is in the circuit when feeding power to the local
switchboard.
b.
One indicator light (blue) to indicate the closed position of the shore connection circuit breaker.
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