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 TM 55-1905-220-14-1
1-50. POWER DISTRIBUTION SYSTEM.
a. Electric power is distributed all over the vessel by a distribution system. The distribution system starts at the
generator main switchboard in the engine access room (1-50-l-Q). A paralleling bus is supplied directly from the
generators by way of the generator circuit breakers.
b. Power at 450 volts is directly connected to a single 450-volt distribution panel (P-400). The distribution panel is
located in the topside deckhouse. All 450-volt power circuits start from this distribution panel (See Figure 1-47). One
circuit of this panel, with the help of transformers, furnishes the 120-volt distribution panel (L-100). All of the 120-volt, 3-
phase mains come from this distribution panel. The transformer bank and 120-volt panel are located in the Engine
Access Room, at Frames 53 and 61.
c. Power at 120-volts is supplied to single phase fuse or circuit breaker type distribution panels. These panels supply
the ship with 120-volt single phase power, lighting, interior communication and electronics loads.
Figure 1-47. Power Distribution System
1-84
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