Electrochemical corrosion
64
Shore power and
battery charging
When shore power is connected (20V–230V), the
shore safety ground (earth) must not be connected
to the engine or any other ground point on the boat.
The safety ground must always be connected to the
connection cabinet's ground (earth) terminal ashore.
The safety ground should not be connected to the
negative connection on the output side (2/24V), i.e.
it must be galvanically separated.
WARNING! Installation and work using shore
connected equipment may only be carried out
by an electrician who is qualified to work on
mains voltage installations. Incorrect installation
can result in danger to life.
Taking into account considerations of personnel safe-
ty and care of the equipment, Volvo Penta gives the
following recommendations regarding shore power
alternating current (AC) installations:
Installations should be made according to figure
or figure 2. Figure shows a single-phase installa-
tion for either 230VAC or 20VAC. Figure 2 shows a
230VAC input, 20/230VAC output installation.
Figures and 2 are based on ABYC E- diagrams
8 and but require a ground fault circuit interrupter
and an isolation transformer. Figures and 2 are
considered best practice and are in harmonywith
recommendations from ABYC and ISO, and provide
protection against electrochemical corrosion and
electrical shock.
The safety related components are important for the
following reasons:
Isolation transformer
The isolation transformer galvanically separates the
shore power from the boat. This minimizes the risk of
galvanic and stray current corrosion.
Ground Fault Circuit Interrupter (GFCI)
Arcing faults between a live conductor and ground
can be sustained at relatively low current levels and
does not trigger circuit breakers. Furthermore, even
very low current levels represent danger to person-
nel. A GFCI must be installed on the secondary side
of the isolation transformer as a ground fault protec-
tion in the boat. The GFCI trip sensitivity and trip time
must comply with local standards.
The GFCI placed on the secondary of the isolation
transformer ensures ground fault protection on the
boat. This is an addition to ABYC E-, that ensures
a higher degree of protection against electrical shock.
Ground plate
To ensure safety of personnel, a common ground
plate below the waterline must be connected to the
AC and DC electrical system.
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