Sailor 100, Installation Manual

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Alternative grounding for aluminum hulls
B-6 Appendix B: Grounding and RF protection 98-136280-B
B.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.
B.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).
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.
B.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 B.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
Important
Remember to make the ADU ground connection at the
same electrical ground potential as the ACU (see
Grounding the ADU ).
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