Training, Installation & Service Manual - Livewire Connections Ltd

F.4 Alternative grounding for
aluminum hulls
The following guidelines assume a two-wire, isolated
grounding arrangement; that is no part of the circuit, in
particular the battery negative, is connected to any ground
potential or equipment.
F.4.1
Grounding the ACU
The ACU should preferably be grounded with the short cable.
Further, the ACU must be grounded at its grounding stud to
ensure a proper grounding if the short ADU cable is
disconnected.
The ground connection must be established at a dedicated RF
ground (either capacitively or electrically coupled).
Important Remember to make the ADU ground connection at the
same electrical ground potential as the ACU (see
Grounding the ADU).
The ACU provides galvanic isolation (as required) from its
input power terminals to the chassis/grounding stud. This
way the isolated grounding arrangement is maintained.
Alternative grounding for aluminum hulls
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F.4.2
Grounding the ADU
If the mounting base of the ADU is electrically connected to
the hull (or any other ground potential than the ACU), the
ADU must be isolated at its mounting bolts by means of
shoulder bushings and washers, see F.6.3. This is done in
order to prevent DC currents flowing in the hull thus causing
electrolytic corrosion.
However, a ground connection must be established via one of
the mounting bolts using a separate ground cable. The
ground cable must be routed parallel and in close proximity
to the shielded coax cable hence connecting the ADU to the
ACU Grounding kit. A heavy gauge wire with tinned strands
(min. 6 mm 2 ) can be used for this purpose.
Grounding and RF
98-133966-E2 Appendix F: Grounding and RF protection F-7