Electrical Installations - Volvo Penta D12 Operator's Manual

Maintenance. Electrical system
Electric welding
Remove the positive and negative cables from the
batteries. Then disconnect all cables connected to
the alternator.
Also undo the two connectors for the EVC system
from the control unit. Press the lock tab down and
pull the connector out.
Always connect the welder earth clamp to the compo-
nent to be welded, and as close as possible to the weld
site. The clamp must never be connected to the engine
or in such a way that current can pass through a bear-
ing.
IMPORTANT! After you have finished welding,
re-connect the EVC connector and the alterna-
tor terminals before you connect the battery
cables.

Electrical installations

An incorrectly done electrical installation can gener-
ate stray currents from the electrical system. Stray
currents, in their turn, can weaken the galvanic pro-
tection of the propeller, propeller shaft, rudder, keel
etc., and cause damage because of electrochemical
corrosion.
IMPORTANT! Work on the low voltage circuits
in the boats 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 provided
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.
. Electrical cables must be installed and clamped
in such a way that they are not exposed to chaf-
ing, damp or splashing water in the bilge.
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