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 a two-wire, 120 vdc system, powered by two 40 kw
Table 2-12 Primary Electrical Circuits.
Equipment
Circuit No.
Overload se
diesel driven auxiliary sets. The system may be
No 1 Air compressor
P1
90A
supplied by shore power through the shore power
No. 2 Air compressor
P2
90
receptacle located on the port side of the after deck
Salt water circulating (standby) pump
P3
90A
house. Power is supplied by the generators, or shore
Fire pump
P4
275A
power, through the main electrical control panel (fig. 2-
Fresh water circulating (standby) pump
P5
90A
Lubricating oil (standby pump)
P6
90A
Bilge pump
P7
35A
the tug. Individual switching with overload protection is
Fuel oil transfer pump
P8
25A
provided at the main electrical control panel for the
Lubricating oil purifier
P9
70A
primary circuit.
Power panel
P10
100A
Steering motor
P11
200A
Windlass
P12
100A
CAUTION
Capstan
P13
100A
Use only 120 vdc power from source
Vent power panel
P14
100A
of shore supply.
(2) Circuit P10 feeds the electrical power panel
located in the passageway at head of the engine room
b. Ships Service Power Operation.
access ladder. Identical switches and fuses for circuits
(1) Primary circuits, circuit designation, and
supplied are located on the power control panel (fig. 2-
main electrical control panel overload settings are listed
in table 2-12 below.
Figure 2-15. Ships service power control panel wiring diagram
c. Ships Service Lighting Operation.
by circuit L1. This panel contains individual switches
(1) The engine room lighting control panel,
and fuses for the engine room lighting circuits (fig. 2-
located at head of the engine room access ladder on
port side, is supplied from main electrical control panel
2-39
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