MIL-DTL-16036M(SH)
e. Where wires run from one section of a switchboard to an adjacent one, and these sections are separated for
shipping or installation purposes, a terminal board shall be provided on one of the units and located in order to
facilitate completion of the interconnections during installation of the switchboard on the ship.
3.11.4 External control cable connections. External control cable connections to the switchboards shall
terminate at terminal boards accessibly located near the top or bottom of the switchboard, corresponding to the
ship s cable entrance. Where calibrated shunt leads are required, they shall terminate on the instrument studs. An
excess length of shunt leads shall be neatly coiled and secured to prevent interference with access to other
equipment. Small wiring to circuit breaker trip coils shall run directly to the coils and associated contact circuits and
shall not be routed through terminals of other apparatus. Taps from bus bars shall be made by through-bolting
terminals to the bus bars.
3.11.5 Synchronizing control circuits. The synchroscope shall be supplied by the phase A-B transformers, and
the synchronizing lights shall be supplied by the phase B-C transformers provided for metering, synchronizing, and
relaying potential as shown on figure 18. The loss of one transformer shall not disrupt both synchronizing facilities.
Closing control circuit of electrically-operated circuit breakers (AC generators, bus ties, and shore power) shall be
connected through contacts of the corresponding synchronizing switch. Synchronizing control equipment shall be
provided as specified in MIL-S-24188 to electrically prevent closing of the generator circuit breakers, bus tie circuit
breakers, or shore power circuit breakers, as applicable, unless the energized systems to be connected are properly
synchronized. Control circuitry external to the synchronizing protective equipment shall be arranged so
synchronizing and paralleling can be accomplished after failure of the synchronizing protective equipment.
Automatic paralleling devices shall be as specified (see 6.2).
3.11.6 Space heater circuits. When space heaters are provided with the associated generator, the heater circuit
shall be supplied through a heater control switch from a local lighting circuit for 120-volt space heaters or from a
power source having emergency supply for 450-volt space heaters. An indicator light (white) shall indicate when
generator heaters are energized. This heater circuit shall be wired through a normally closed contact (closed when
breaker is open) of the associated generator circuit breaker auxiliary switch.
3.11.7 Indicator light power. On surface ships, the indicator lights of the mimic bus shall be supplied from a
local lighting system that has available both normal and emergency power. On submarines, power for the indicator
lights shall be taken from the AC or DC control power buses.
3.11.8 Control transformers. Control transformers shall be provided as required.
3.11.9 Ground detector lights. Ground detector lights shall be connected as shown on figure 19.
3.11.10 Voltage regulator connections. Voltage regulator equipment shall be connected in accordance with the
drawings provided with the regulator equipment.
3.11.11 Wire and terminal marking. Internal wiring of equipment shall be marked on both ends by fiber tags or
by synthetic resin tubing Type F, Grade A of MIL-I-631 (see figure 17). Markings shall agree with the designation
shown on the switchboard drawings to facilitate checking of connections. It shall not be necessary to mark the
terminal studs on instruments and control switches, but wiring diagrams shall clearly indicate the studs or contacts to
which marked wires are connected. Terminal blocks shall be equipped with marking strips. These marking strips
shall be permanently marked at each terminal with a number (for example, 1 to 12) and also to agree with the
corresponding number on the wiring diagram. Terminal blocks in each unit shall be numbered TB1, TB2, and so
forth.
3.11.12 Shunt trip coil circuits. Shunt trip coil circuits (both AC and DC) for tripping Type ACB and AQB
circuit breakers shall be routed through a normally open contact (open when the breaker is open) of the circuit
breaker auxiliary switch, so that the trip coil cannot remain energized after the circuit breaker is open.
3.11.13 Control voltage. Control voltage within the switchboard shall normally be 120 volts AC or DC. Where
450-volt control circuits are used for circuit breaker control, they shall be clearly identified.
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