MIL-DTL-16036M(SH)
3.8.6.2 Mounting of casualty power equipment. Casualty power circuit breakers and back-connected terminals
shall be mounted at the rear or on the side of the unit. When mounted within the unit, the casualty power equipment
shall be readily accessible from the rear of the unit so that cables may be connected to the terminal without undue
exposure of the personnel to live parts. Rear enclosures shall not be used for support of the terminal or circuit
breaker, nor shall its removal be necessary for access to the terminal or for operation of the circuit breaker. When
mounted on the side of the unit, the riser terminal shall be surface mounted, and the circuit breaker shall be
removable without removal of the side sheet. Normally, the circuit breaker and riser terminal shall be located
adjacent to one another so that personnel may readily determine that the breaker is open and the terminal not
energized before making connections. Allow approximately a 14-inch diameter area about the centerline of the
terminal for installation of cables into terminal.
3.8.6.3 Casualty power circuit breaker rating. Circuit breaker Type AQB-A or AQB-LF shall be provided with
an element rated at 250 amperes. Unless otherwise specified (see 6.2), instantaneous trip settings shall be as follows:
AQB-A circuit breaker - 3400 amperes and AQB-LF circuit breaker - 3000 amperes. For generators rated 1000
kilowatts and below, an AQB-A circuit breaker shall be furnished. For generators rated above 1000 kilowatts, an
AQB-LF fused circuit breaker shall be furnished.
3.8.7 Voltage regulator equipment. Where voltage regulator equipment conforming to MIL-R-2729 is required
to be installed in the switchboard, the space and arrangement of this equipment shall allow for accessibility for
maintenance and provide the electrical insulation distances as specified (see 6.2).
3.8.8 Accessibility. Equipment, bus work, fasteners, and electrical connections that may require servicing,
repair, or replacement during the life of the switchboard shall be readily accessible for servicing, inspection,
tightening, repair, or replacement. Access shall be maintained after all bus work, switchboard wiring, and ship
cabling are installed.
3.9 Shore power. (see figure 2)
3.9.1 Phase sequence indicator. The phase sequence indicator shall conform to MIL-I-16103. It shall be wired
through a multiposition selector switch. The switch shall have one position for each shore power feeder and an off
position.
3.9.2 Reference selector switch. The reference selector switch shall be used to establish a reference shore
power feeder for checking phase orientation. There shall be one switch position for each shore power feeder. The A
and B phases of each feeder shall be connected to the switch terminal and the corresponding switch terminal of the
phase sequence/orientation test switch. The phase sequence/orientation test switch shall be used to check that the A
and B phases of the incoming shore power are connected to the A and B phases of the other shore power feeders.
There shall be one switch position for each shore power feeder. The wiper arm of the reference switch shall be
connected to one terminal of the indicator. The other terminal of the indicator shall be connected to the phase
sequence/orientation test switch wiper arm. Both green indicators shall light if the phases are the same. The
indicator shall be located next to the reference selector switch and the phase sequence/orientation test switch.
3.9.3 Circuit breaker control switch. The circuit breaker control switch shall be a momentary contact, new
position indicator with a close contact and an open contact for each shore power breaker. The switch shall
simultaneously control all shore power circuit breakers. Circuit breakers shall be Type AQB-LF 400, motor
operated with a 400 ampere element. Instantaneous shall be at the maximum setting. Breaker shunt trip shall be
wired through the shore power receptacle interlock switch so the circuit breaker trips when the shore power
receptacle cover is open or the cable is not connected.
3.10 Bus bars and connectors.
3.10.1 Bus connections. Bus connections shall be made with solid copper. See 3.10.18 for 100-ampere circuit
breaker connection requirements.
3.10.2 Copper bus bars. Rectangular copper bus bars with rounded corners or round edges, hard temper in
accordance with ASTM B187/B187M, shall be used for bus bars. Bars shall be silver surfaced at the contact areas as
specified herein.
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