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H - 5
120 (220) VOLT ELECTRICAL SYSTEM
The boat is equipped with 30 amp, 120 volt, 60 Hertz (or
15 amp, 220 volt, 50 Hertz) AC electrical wiring. When
the boat is connected to a shore power outlet, the AC
system supplies electrical power to the following items:
battery charger, refrigerator, water heater, range, micro-
wave, icemaker, and outlets. The air conditioner has its
own dockside power plug. The dockside system uses
three-wire, color-coded circuitry. The black or hot wire is
the ungrounded current carrying conductor. The white or
neutral wire is the grounded current carrying conductor.
The green wire, referred to as the "equipment ground," is
a grounded conductor, and under normal conditions is
not a current carrying wire. The neutral wires are con-
nected together at a buss bar. The equipment grounds
are similarly connected together at another buss bar. Each
hot wire is connected to, and protected by, a circuit breaker
in the AC distribution box located at the top section of
the AC/DC main panel
The distribution box houses the system circuit breakers.
The standard dockside system has a main circuit breaker
which protects the overall distribution network. The 378's
dockside inlets are in the aft shore power tub. See
Figure H3. The 378 has a MAIN circuit breaker located
underneath the starboard cockpit aft seat which must
be in the "ON" position in order to indicate a reverse
polarity situation. See Figure H4. Also, a second set
of MAIN circuit breakers are located on the AC cabin
panel. Both MAIN breakers must be turned "ON" for AC
system operation. The MAIN circuit breaker protects
both the hot and neutral input leads. This breaker is
sensitive. The resulting power surge which occurs when
connecting the shore power cord may cause the MAIN
breaker to trip. To avoid this power spike, ensure the
MAIN breaker at the AC cabin panel is turned off before
plugging in the shore power cord. Securely connect the
power inlet of the boat and the shore power receptacle.
Once the shore power is securely connected, turn the
MAIN breaker on. If the connection is broken and later
re-secured, the circuit breaker may trip. Connections
must be secure for uninterrupted dockside service.
378 Vista™ Owner's Manual
™
378
Transom Shower
Transom Shower Mixer
Figure H3: Shore Power Tub
Figure H4: Additional Main Circuit Breakers for
Dockside Power (located under Stbd Aft Seat)
H - 6
DOCKSIDE OPERATION
If any abnormalities appear during dockside op-
eration, DISCONNECT the system immediately
to prevent electric shock hazards! Have the boat's
electrical system and the shoreside receptacles
checked as soon as possible.
Dockside Inlets TV/Phone
Shore Water Hose
Section H
Page 5
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