Electrochemical corrosion
65
Prevention of stray currents
during installation
A proper installation will reduce the risk of stray cur-
rent problems later in the boat’s service life.
• All DC circuits must have an insulated return ca-
ble. Consequently, a metal keel must not be used
as a return conductor.
• All splices in the circuit such as socket housings
and terminal blocks shall be installed so that they
are not exposed to moisture or bilge water. The
same applies to switch panels, fuse holders etc.
• Cables shall be routed as high as possible above
the bilge water in a keel. If a cable must be routed
where it is exposed to water, it must be housed
in a watertight conduit and the connections must
also be watertight.
• Cables which can be subject to wear must be
installed in self-draining conduits, sleeves, cable
channels etc.
• For battery and main switch installation, please
refer to the
Electrical System chapter.
• Engines and drivelines must not be used as a
ground (earth) for radio, navigation or other equip-
ment where separate ground cables are used.
• All separate ground (earth) cables (ground con-
nections for radio, navigation equipment, echo
sounder etc.) must be linked to a common ground
(earth) point, i.e. a cable that does not normally
act as a return for equipment.
• If shore based power is connected (20V/230V),
the safety ground (earth) must not be connected
to the engine or any other ground point on the
boat. The safety ground must always be con-
nected to the connection cabinet’s shore ground
terminal.
• Transformers connected to a shore base current
supply, such as a battery charger, shall have the
protection ground (earth) on the input side (20/
230V) connected but the negative connection on
the output side (2/24V) not connected, i.e. gal-
vanically separated.
WARNING! Installation and work on shore con-
nected equipment may only be carried out by
an electrician who is qualified to work on instal-
lations with voltage higher than 50V AC.
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