1
Electrical installations
A faulty electrical installation can generate stray
currents from the electrical system. Stray currents
can weaken the galvanic protection of the propeller,
propeller shaft, rudder, keel etc., and cause damage
because of electrochemical corrosion.
IMPORTANT! Work on the low voltage circuits
in the boat should be done by a person with
electrical training or knowledge. Installation or
work on land current equipment must only be
done by a competent electrician, in accordance
with local regulations for mains electricity.
Always consider the following:
1. If land current is connected, its protective earth
must be connected ashore, never to the boat.
The land current installation must also be provi-
ded with an earth fault breaker (RCCB). The land
current installation (transformer, inverter, battery
charger etc. ) must be intended for marine use,
where the high voltage section is galvanically
isolated from the low voltage section.
2. Electrical cables must be installed and clamped
in such a way that they are not exposed to cha-
fi ng, damp or splashing water in the bilge.
3. Protective earth cables for radio, navigation equip-
ment, rudder, bathing steps etc., or other equipment
which uses protective earthing, shall be connected to
a common earthing point which is not connected to
the engine or reverse gear.
IMPORTANT! The engine and reverse gear
must never be used as earth planes.
4. The starter battery shall have a main switch on
the positive (+) side of the battery. The main switch
must disconnect all loads and shall be switched off
when the boat is not used.
5. If an extra auxiliary battery is used, a main switch
(1) must be connected between the auxiliary battery
positive (+) pole and the fuse box for the boat’s elec-
trical equipment. The main switch must disconnect all
loads connected to the auxiliary battery and shall be
switched off when the loads are not used.
All equip-
ment connected to the auxiliary battery shall have
separate switches.
NOTE! A charge splitter (optional) should be installed
to charge two independent battery circuits from the
standard alternator.
79
Maintenance. Electrical system
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