Alternative ground for aluminum hulls
C-6 Appendix C: Ground and RF protection 98-141779-G
C.4 Alternative ground 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.
C.4.1 To ground the ACU
To ground the ACU do as follows:
1. Ground the ACU preferably with the short cable.
2. Ground the ACU at its grounding stud to ensure a proper grounding if the short ADU
cable is disconnected.
3. Establish the ground connection 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.
C.4.2 To ground the ADU
To ground the ADU do as follows:
1. If the mounting base of the ADU is electrically connected to the hull (or any other
ground potential than the ACU), isolate the ADU at its mounting bolts by means of
shoulder bushings and washers, see C.6.3 . This is done in order to prevent DC currents
flowing in the hull thus causing electrolytic corrosion.
2. However, you must establish a ground connection via one of the mounting bolts and a
separate ground cable.
Remember to make the ADU ground connection at the same electrical
ground potential as the ACU (see To ground the ADU).
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