MIL-DTL-16036M(SH)
(2) Indicator lights (yellow) for each frequency changer output contactor and bus tie circuit breaker.
(3) Single-pole, double-throw switch for each circuit breaker light. These switches shall be combined with
their yellow lights and arranged so that when the switch handle indication and the circuit breaker position (open or
closed) are the same, the light shall be out. When the circuit breaker position and the switch handle indication are
different, the light shall be on. For indicator light power supply, see 3.11.7. Black mimic bus material shall be 1/8
inch thick, 1/4, 3/8, or 1/2 inch wide, as specified (see 6.2). Mimic bus materials shall be laminated plastic
conforming to Grades ES-1, ES-2, or ES-3 of ASTM D709; aluminum alloy conforming to ASTM B209, alloy
5052; commercial brass conforming to ASTM B36/B36M and ASTM B121/B121M; corrosion-resisting steel
conforming to Type 316 of ASTM A167, ASTM A240/A240M, and ASTM A666; or nickel-copper alloy
conforming to ASTM B127, ASTM B164, and ASTM B564.
b.
One current meter for reading one phase of each frequency changer output.
c. One pushbutton switch combination for actuating each frequency changer input contactor. One indicator
light (white) to indicate that the unit is energized.
d.
One control switch with indicator light (blue) for each frequency changer output contactor.
e.
One control switch with indicator light (blue) for control of each 400 Hertz bus tie circuit breaker.
f. One remote control switch with indicator light (blue) for control of each applicable 400 Hertz distribution
circuit breaker.
g. One set of three indicator lights (white) with a control switch to indicate ground conditions on the main
400 Hertz bus.
h.
Solid-state frequency changer failure mode indicators as required (see 6.2).
3.4.1.6 ACB circuit breaker distribution unit. This unit shall provide for the distribution of power from the
main bus as specified (see 6.2). The following shall be provided:
a.
Circuit breakers having current rating and protective features as required.
b. Indicator lights (blue) mounted on the front panel adjacent to or on the circuit breaker escutcheon to
indicate when each of the feeder circuit breakers is closed.
c. Control switches shall be provided for electrically-operated circuit breakers. Where the switchgear group
has EPCP or EPCC, or both, these switches shall be located on the EPCP or EPCC, or both.
d. Necessary disconnecting devices for disconnecting cables between switchgear sections and performing
other switching functions. NOTE: Where a circuit breaker supplies a feeder which may be energized from another
source, such as the emergency switchgear group, an indicator light (white) shall be provided to indicate feeder is
energized.
3.4.1.7 AQB circuit breaker distribution unit. This unit shall provide for the distribution of electric power or
lighting supply (450/120 volts) through Type AQB circuit breakers as specified (see 6.2). Units receiving two
sources of supply shall be provided with interlocked NQB or AQB circuit breakers. Where interlocked circuit
breakers are installed, an indicator light (white) shall be provided for each power supply to indicate when power is
available (see 3.4.4).
3.4.1.7.1 Spaces. Spaces for the future installation of circuit breakers shall be blanked off, with busing installed
for the circuit breakers. Mounting blocks shall also be installed for AQB circuit breakers. Circuit breaker panel
blanks shall be securely fastened in place so that the blanks or the fasteners shall not fall into the interior of the
switchboard under any anticipated operating conditions. They may be constructed from conducting or
nonconducting material.
3.4.1.8 ACB-AQB circuit breaker distribution unit. This unit shall provide for distribution of power through
both ACB and AQB Types of circuit breakers as specified (see 6.2). It shall contain the devices listed in 3.4.1.6
through 3.4.1.7.1.
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