Alternative ground for aluminum hulls
99-145912-A Appendix B: Ground and RF protection B-7
B.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.
B.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 ACUat 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.
B.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
B.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.
3. Route the ground cable parallel and in close proximity to the
shielded coax cable hence connecting the ADU to the ACU
Grounding kit. Use a heavy gauge wire with tinned strands (min. 6
mm
2
) for this purpose.
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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