MIL-HDBK 1028/6A
a) Two 100 ampere, three-pole, 600 V, 60 Hz, molded case circuit
breakers mounted on the interior of the enclosure.
b) Two 100 ampere, 480 V, three-phase, four-wire, 60 Hz
receptacles conforming to MIL-C-22992 (Class L) and MS90555-C-44-150S
(Government-furnished equipment). This receptacle will match cable plugs
MS90556C-44-151P, MS90556-C-44-152P, or MS90556-C-44-156P provided with the
ground support equipment. Receptacles shall be mounted on the bottom
exterior of the enclosure. Provide additional receptacles to match
aircraft requirements.
c) One 3 kVA, one-phase, 480-120 V, 60 Hz, dry type transformer
with two-pole primary circuit breaker and a one-pole,
20 ampere secondary breaker. The transformer shall provide power for
control and 120 V receptacles. The transformer and the protecting breakers
shall be mounted on the interior of the electrical enclosure.
d) Two 20 ampere, 125 V, one-phase, two-pole, three-wire, duplex
receptacles with ground fault interrupting. One receptacle shall be
mounted on each of the exterior center, hinged panels.
8.1.5.2
400 Hz Components.
The 400 Hz components shall consist of:
a) 400 Hz output from the hangar service point enclosure shall
be through either electrically operated contactors or 400 Hz circuit
breakers. Typically, contactors are utilized on systems with aircraft
having a 48 V dc feedback circuit and shall have three-phase overload
protection. Contactors and breakers shall be furnished with lugs for
connection of the four-wire, Size 2 AWG conductor, flexible aircraft power
cable that conforms to MS90328 (Government-furnished equipment). Provide
cable grips and neoprene grommets for enclosure sidewall openings for the
direct (hard-wired) connection of the aircraft power cable to the
contactor.
b) Each contactor and circuit breaker shall have two pilot
lights, one marked "Power On" with red lens and one marked "Power Off" with
green lens mounted on exterior of the enclosure (on the side of the
associated contactor or breaker). Operate the contactor and breaker from
the front of the enclosure.
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