Volvo TAMD74C, Operator'S Manual

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56
Maintenance: Electrical system
Electrical installations
Defective electrical installations can generate stray
current from the electrical system. Stray current can
impair the galvanic protection for the propeller, pro-
peller shaft, rudder, keel, etc. and cause damage due
to electrochemical corrosion.
IMPORTANT! Service on the boat’s low-current
circuit should be carried out by a person with
electrical training and experience. Installations
or work with shore power equipment must only
be performed by an electrician qualified for high-
current installations.
The following points must always be taken into
account:
1. If the shore power line is connected, it must have
a protective earth on land, never in the boat. The
shore power equipment must also be equipped
with an earth fault breaker.
The shore power equipment (transformer, convert-
er, battery charger, etc.) must be intended for ma-
rine use where the high-voltage section is galvani-
cally isolated from the low-voltage section.
2. Electric cables must be run and clamped so there
is no risk of it being exposed to chafing, moisture
or bilge water in the keelson.
3. Protective earth for e.g. radio, navigation equip-
ment, rudder, bathing ladder or other equipment in
which there are separate cables for protective
earth must be collected on an earth connection
that is not connected to the engine or reverse
gear.
IMPORTANT! The engine or reverse gear
must never be used as an earth connection.
4. The battery must have a main switch connected
on the positive (+) side of the battery. The main
switch isolates all consumers and is turned off
when the boat is not in use.