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The I.C. systems of a modern fleet type submarine usually consist of about 24 circuits. With few exceptions, they are supplied with power through the I.C. switchboard located in the control room.
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... as I suspected...
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Collision alarm system (circuit CA)
General alarm system (circuit G)
Diving alarm system (circuit GD)
General announcing system (circuit 1MC)
Submarine control announcing system (circuit 7MC)
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8A2. Systems requiring alternating current....
General announcing systems (alarm signals and voice communication)
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b. Source of power. The alternating current power supply to this switchboard is obtained from the I.C. motor generators which are comprised of either 250-volt d.c. motors and 120-volt a.c. generators, or 120-volt d.c. motors and 120-volt a.c. generators, depending upon the type of installation.
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Looks like I answered my own questions. I guess it's a matter of getting AC power to the circuit board in the control room, then.