3-7.1.3 Switchboard distribution panel. This panel (Figure 3-12 and Figure 3-13) controls two functions: fault detection
panel and power distribution panel.
440 volt ground fault detection. This panel shows three lights, labeled: PHASE 1, PHASE 2, and PHASE 3. A
fourth light is a press-to-test method of checking these three indicator bulbs.
Barge 1 power distribution panel has 14 active and one spare circuit breaker, each one labeled with its function.
Barges 2 and 3 distribution panels have 13 active and three spare circuit breakers, each one labeled with its
3-7.1.4 Paralleling and control panels. These panels (Figure 3-14) are located in center of switchboard below SSG 2
control panel. They include the following controls and indicators:
VOLTMETER (V). Reads incoming generator voltage selected with the INCOMING GENERATOR switch. Left
gauge in top row of three gauges.
FREQUENCY METER. Reads generator output frequency selected with INCOMING GENERATOR switch.
Center gauge in row of gauges.
SYNCHROSCOPE (SS). Shows synchronization between the incoming generator selected with
INCOMING GENERATOR switch and the switchboard bus. Right gauge in row of gauges.
INCOMING GENERATOR SWITCH (IGS). Switch has four positions: OFF, GEN 1, GEN 2, and GEN 3. Switch
selects which generator is being synchronized with the bus. That generator's voltage and frequency are shown
on gauges above the switch. Place switch in OFF position when not being used for synchronization.
GENERATOR. status lights. These subpanels, just below grab rail on center portion of switchboard, show status
of each generator. RUN light shows generator is running. The next two lights show generator circuit breaker
position as OPEN or CLOSED. The subpanels are labeled GENERATOR 1 on the left, GENERATOR 2 in the
center, and GENERATOR 3 on the right.
Generator circuit breakers. These circuit breakers (P1 for SSG 1, P2 for SSG 2, and P3 for SAG) connect
generator output to switchboard bus and are located beneath the corresponding generator status lights. Label
plates identify each circuit breaker.
3-7.1.5 Miscellaneous controls and indicators. The lower right switchboard panel (Figure 3-15) monitors the three
battery chargers that maintain generator battery banks and shows status of the shore power circuit breaker. Panel
indicators and controls include the following:
DC AMMETERS (AM) and DC VOLTMETERS (VM). These meters indicate operation of battery chargers for
SSG 1, SSG 2, and SAG.
BATTERY CHARGER (BC) switches. This is a two-position toggle switch with FLOAT to left and EQUALIZE to
right. FLOAT is the normal setting. Each switch controls battery charging for one of the three generator set
SHORE POWER status lights. These three status lights show shore power receptacle status. AVAILABLE
indicates power is plugged into shore power receptacle on aft weatherdeck portside. The other two lights show if
the shore power circuit breaker is OPEN or CLOSED.
SHORE POWER circuit breaker. Circuit breaker P4 connects shore power to switchboard bus. When this circuit
breaker is dosed (ON), generator circuit breakers will NOT dose.
PHASE ROTATION status lights. These two status lights indicate the shore power phase rotation. The shore
power breaker will not dose if the phase is not in proper sequence.