Volvo Penta D3 Operator's Manual page 104

Maintenance
P0002900
102
Electrical Installations
An incorrectly designed electrical installation may gen-
erate leakage current from the electrical system. Leak-
age current can in turn render galvanic protection inad-
equate in respect of propellers, propeller shafts, rudder
posts, the keel etc., and may cause damage through
electrochemical corrosion.
WARNING!
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.
The following must always be heeded:
1 If shore power is connected it must always be
ground protected ashore, never in the boat. Fur-
thermore, the shore power installation should be
equipped with a ground fault circuit interrupter.
The shore power installation (transformer, inverter,
battery charger etc.) must be designed for marine
use where the high-tension side is galvanically
separated from the low-tension side.
2 Electrical cables must be run and clamped such
that there is no risk of exposure to chafing, damp or
bilge water.
3 Ground protection for radios, navigation instru-
ments, rudder, boarding ladders or other equipment
where separate cables for ground protection are
present, must be clustered to a common ground
connection that is not connected to the engine or
reverser gear.
IMPORTANT!
The engine and reverse gear must never be used
as earth planes.
4 The start battery must have a main switch (1) con-
nected to the battery's positive (+) side. The main
switch must break the circuit to all equipment and
be switched off when the boat is not in use.
5 If an auxiliary battery is used, a main switch must
be placed between the auxiliary battery's positive
(+) terminal and the circuit breaker panel for the
boat's electrical equipment. The main switch must
break the circuit to all equipment connected to the
auxiliary battery and must be switched off when
power is no longer required. All equipment con-
nected to the auxiliary battery must have separate
main switches.
For simultaneous charging of two independent battery
circuits a separate charging distributor (accessory)
should be installed on the standard alternator.
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