TM 55-1930-209-14&P-1
c.
Electrical power is distributed through a switchboard distribution panel (Figure 3-1 for Barge 1 and Figure 3-2 for
Barges 2 and 3) and these additional distribution panels:
Power panel 1 (440 Vac) (Figure 3-3)
Power panel 2 (440 Vac) (Figure 3-4)
Power panel 3 (120 Vac) (Figure 3-5)
Power Panel 4 (440 Vac) (Barge 1) (Figure 3-6)
Deck lighting panel (120 Vac) (Figure 3-7)
Void lighting panel (120 Vac) (Figure 3-8)
Receptacle panel (120 Vac) (Figure 3-9)
Emergency lighting panel (120 Vac) (Figure 3-19)**
Direct current panel (24 Vdc) (Figure 3-18)**
** Discussed in Section III, Emergency electrical system.
d.
Transformers change electrical power from 440Vacto either 220 Vac or 120 Vac. Three 15 kVA transformers (in
parallel) on switchboard circuit breaker P13 provide 120 Vac power for power panel 3 which provides 120 Vac
power distribution for the barge. One 2 kVA transformer on power panel 1 circuit breaker 11 P5 provides 220 Vac
for the electric motor that powers the drinking water pressure set.
e.
Mechanisms such as starters, controllers, and switches provide another level for controlling electrical power.
These are discussed in the TM for each individual system.
f.
The final elements are the electrical power consuming devices such as motors, lights, and heaters. These are
discussed in the volume for the system of which they are a part.
3-2.2 Major components of this system are listed in Table 3-1 and shown in engineering drawings listed in
TM 55-1930-209-14 & P-9.
3-3 Capabilities. This system provides electrical power for operating the barge equipment. Either of two 155 kW SSG's
provide sufficient electrical power to operate all systems onboard. The SAG provides sufficient power for barge
occupancy but not for major ROWPU systems operation. When onboard generator sets are not operating, power can be
supplied through the shore power receptacle from onshore or from another vessel. An emergency shutdown system is
also provided to stop individual systems or to stop all electrically powered equipment onboard. Paragraph 3-7.9 provides
additional information.
3-4 Special limitations. This system must have sufficient fuel for diesel-powered generators and the generators must
be operational.
3-5 Performance characteristics
a.
Shore power to switchboard
440 Vac, 60 Hz, 3 ph
b.
Generators to switchboard
440 Vac, 60 Hz, 3 ph
c.
Switchboard
440 Vac, 60 Hz, 3 ph
3-2
