Mainship 40 Trawler Single & Twin • AC Electric Systems
8.3
Fig. 8.1 gives you a look at the shore power connection
showing the breaker location.
Connecting Shore Power
Follow these procedures to connect shore power to your
boat:
1. Turn all 120V circuit breakers at main control panel to
OFF. Shut down generator if it is operating.
2. Connect the female end of the 50 amp (yellow) shore
power cable to the boat's inlet receptacle. Make sure the
lock is tight.
WARNING
! !
DO NOT connect the shore power cord to the dock-
side electrical source first. You could acciden-
tally drop the cord into the water which may result
in electrical shock and serious personal injury.
Using a damaged or improper cord for shore power
can cause electrical shock and serious injury. Use a
cord specifically designed for shore power connec-
tion. Do not use a household extension cord.
3. Make sure the dockside shore power outlet is OFF.
Plug the male end to the dock outlet, make sure the
cable has enough slack to prevent stretching caused by
tidal changes.
4. Turn the dockside power breaker ON.
Disconnecting Shore Power
To disconnect shore power:
1. Switch off all circuits.
2. Swtch off the dock circuit breaker.
3. Disconnect the shore power cables from the dock
outlets.
4. Disconnect the shore power cables from the boat's
inlet receptacles. Store the cables in a safe place where
they will not become wet or damaged.
8.1.2 Isolation Transformer
Beyond the shore power connection and the shore
power breaker, your AC power will be routed through the
Isolation Transformer. See the Mechanical Arrangement
Illustration for the location of the ISO transformer.
The ISO transformer is a standard “dry” type 3.6 KVA
transformer that basically isolates your boat from the
shore power. It is a valuable safety feature aboard your
boat.
8.1.3 Generator Power Supply (option)
The optional generator on your boat provides 120V 60
Hz AC power for operating devices and equipment con-
trolled through the AC Distribution Panel. The generator
is controlled from the AC Distribution Panel.
The cooling system for the generator engine is a closed
system. Engine coolant is circulated through a heat
exchanger. Heat is tranferred from the engine coolant to
sea water circulating through the chambers in the heat
exchanger. The sea water is then ejected through the
generator exhaust through the port side of the boat.
Connecting Generator Poawer
Before connecting generator power to the AC system:
1. Shut down all AC devices and equipment.
2. Disconnect shore power if connected.
3. Start generator. (See generator stsrt-up instructions
following.)
4. Move slide bar to lock out shore power. Set
GENERATOR circuit breaker ON.
5. Switch on only the circuits you will be using.
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