TM 11-5895-463-15
of the power cable stub to the neutral terminal
a. Preliminary Procedures.
and the black wire of the power cable stub to
(1) Make sure that all circuit breakers
the other terminal.
and equipment power switches in the shelter
(3) If the power source is a 110/220
are off.
volt, 50- to 60-cps, single-phase or two-phase,
(2) Remove the power cable assembly and
three-wire distribution system, connect the
able reel (fig. 51) from the shelter.
green and white wires of the power cable stub
(3) Unwind the power cable assembly
to the neutral terminal and the black wire to
and power cable stub from the cable reel.
either of two other terminals.
Caution: Power for the AN/MSC-31A
(4) If the power source is a 110/220-
is normally supplied through the IN POWER
volt, 50- to 60-cps, three-phase, four-wire dis-
115V AC connector. The POWER 115V AC
tribution system, connect the green and white
OUT connector is provided to supply power
wires of the power cable stub to the neutral bus
to another shelter or to supply power to the
bar and the black wire of the power cable stub
AN/MSC-31A if the IN POWER 115V AC
to the phase 1, phase 2, or phase 3 bus bar.
connector is damaged. When the POWER
(5) Connect the power calbe stub to one
115V AC 0UT connector is used to supply
end of the power cable assembly. Connect the
power to another shelter, do not allow the
other end of the power cable assembly to the
total current drain to exceed 60 amperes) cur-
IN POWER 115V AC receptacle in the power
rent rating of power cable assembly between
entl-ante box (fig. 1-4) on the AN/MSC-31A.
the AN/MSC-31A and power source).
b. Connection to Motor-Generator Set. If a
motor-generator set is used to provide power
All telephone and intercommunication connec-
to the AN/MSC-31A, connect power to the
tions are made through the signal entrance box
shelter as described in (1) and (2) below:
on the AN/MSC-31A.
therwise, connect power as described in c be-
low.
a. Twenty-Six Pair Cable Connection Proce-
dure.
(1) Remove the cover from the IX
(1) Unlock and remove the covers from
POWER 115V AC receptacle in the power en-
the 26-pair cable assembly (A and B, fig. 2-4)
trance box (fig. 14) and from the connector
and on the 26-pair receptacle (A, B, C, and D,
on one end of the power cable assembly. Con-
nect the power cable assembly to the IN
(2) Insert the connector into the recepta-
POWER 115V AC receptacle.
cle and secure it by closing the locking collar
(2) If the motor generator set includes
(E, F, and G, fig. 2-5).
an output connector that is compatible with the
(3) If the required cable distance exceeds
connector on the power cable assembly, con-
250 feet, couple two 26-pair cable assemblies
nect the power cable assembly to the generator
together.
set; otherwise, refer to the motor-generator set
Note. To avoid poor quality signals, do not
manual and connect the leads (white lead neu-
connect more than six `X-pair cable assemblies
tral) of the power cable stub to the appropriate
together.
output terminals of the motor-generator set.
b. Field Wire Connection Procedure.
Connect the power cable stub to the power
(1) Connect and field wires to the
cable assembly.
PHONE and INTERCOM binding posts in the
c. Connection to Central Power Source.
signal entrance box (fig. 15).
(2) Loosen the Captive screws and lift the
(1) Turn off or disconnect the central
wer source before making any connections.
cover of the signal entrance box.
(2) If the power source in a 120-volt, 50-
(3) Depress the binding post to open the
to 60-cycle per second (cps), single-phase, two-
wire slots. Place the field wires in the appro-
wire source, connect the green and white wires
priate slots, and release the binding posts.
