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NAVIGATOR OPERATING MANUAL
NW Explorations
4F4: AC Metering
Adjacent to the lower helm are two meters which show the
AC voltage available and the current in amperes (amps) being
used by the boat. When connected to shore power or with
the generator running, you should have between 110 and 130
volts, 105 volts minimum. When connected to 30-amp shore
power you should not turn on too many breakers, lest the load
exceed 30 amps; with the generator, do not exceed 80 amps.
4F5: AC Reverse Polarity
Although we tend to think of AC Electricity as having only two
conductors, it actually has three. One of these is called “neutral”; one is “hot”; and one is “ground”, that is, it is
supposed to be the same as the water around the boat and the earth ashore.
The vessel and many of its appliances rely upon these connections having the correct “polarity”, or relationship
to one another and the earth; this is essential to be sure that users of AC equipment do not get a shock when
touching any AC equipment.
Now in a house ashore, it’s easy: We don’t “plug in” the house, for it stays connected to the utility company
all the time! But in a boat when in the harbor, we do plug in using our Shore Power cords (and sometimes
using extension cords). If the outlet to which we plug our cord, or if the cord itself is mis-wired, then these
connections can become mixed up, and then there is a significant chance of getting a shock or just as bad, a
chance that running gear outside the boat will be subject to rapid corrosion, because the boat is immersed in
sea water, a good conductor of electricity.
To protect the vessel and its crew from such contingencies, a “Reverse Polarity Warning” light will illuminate
when the connection turned on.
If the “Reverse Polarity” light should illuminate when connecting to Shore Power, immediately
disconnect the cable and contact the harbor master advising him/her of the problem. Do not risk
shock or system damage!
4F6: AC Shore Power, Disconnecting & Connecting
The large AC selector switch at the bottom of the power panel is used to determine the source of
AC power for the boat.
The switch has four positions, “Off”, “Gen”, “Fwd Shore”, and “Aft Shore”. The “Shore” positions represent the
bow and stern shore power connectors for the shore cable.
This switch should be left “OFF” whenever you are connecting or disconnecting the boat to shore. This is true
so that you do not draw an arc from the plug due to the load of the boat on the connector’s pins: such an arc
will burn the contacts and eventually cause them to overheat when in use, creating a fire hazard.
Once connected to shore power, monitor the AC voltmeter and ammeter to be sure you have not overloaded the
circuit.
The AC voltmeter and ammeter let you
monitor your power use.
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