TM 55-1930-209-14&P-19
Table 9-2. Major Components of Emergency Electrical System
Component
Location
Function
24 Vdc battery charger
Workshop
Keeps battery bank charged
DC-AC standby inverter
Workshop
Converts 24 Vdc from batteries to
115 Vac for emergency lighting
panel
Battery bank
Deckhouse
Provides 24 Vdc to DC power
top forward
panel and to input side of inverter
24 Vdc power panel
Workshop
Provides 24 Vdc power for Army
radio and telephone system,
foghorn, bilge alarm module,
emergency shutdown system,
and navigation and status lights
120 Vac emergency
ROWPU space
Provides power to emergency
lighting panel
forward bulkhead
lights in deckhouse and voids,
marine radio and telephone
buzzer system
9-3 System description.
9-3.1 Normal electrical system description. The normal electrical system provides electrical power for the operation
of major auxiliary systems on the barge including the emergency system battery charger.
Normal electrical power is generated onboard by one of three diesel-powered generator sets. These generators, located
in voids 4, are normally operated and controlled from a master switchboard in the ROWPU space. Chapter 4 provides
detailed information on the two ship service generator (SSG) sets, and Chapter 5 provides similar information on the ship
auxiliary generator (SAG) set. When all generator sets are shut down, a shore-based powerplant or another vessel can
be used to provide electrical power to operate onboard equipment. This outside source is connected to the barge through
electrical cabling to awatertight shore power receptacle on aft weatherdeck portside. These sources provide 440 Vac, 60
Hz, 3 ph electrical power.
Power control and distribution is provided by a main switchboard on the port bulkhead aft of diesel high pressure (HP)
pumps in the ROWPU space. This unit has six panels, three above the grab rail and three below. The three panels
above the grab rail are controls and indicators for the three diesel generators in voids 4. The lower left (as operator faces
the switchboard) distribution panel has two rows of circuit breakers that provide initial normal power distribution. Two
lower right panels contain controls and indicators for the electrical systems. This panel also has indicators for ground
detection system. Normal electrical system controls and indicators are discussed in paragraph 2-10.
9-2
