Alternative ground for fibre glass hulls
99-145912-A Appendix B: Ground and RF protection B-9
B.5 Alternative ground for fibre glass hulls
B.5.1 To ground the ACU
To ground the ACU do as follows:
1. Preferably ground the ACU with the short ADU cable and a
grounding kit (available from Thrane & Thrane A/S).
2. Ground the ACU at its grounding stud in order to ensure a proper
grounding if the short ADU cable is disconnected.
3. You must establish the ground connection at a dedicated RF ground
(either capacitive or electrical coupled).
B.5.2 To ground the ADU
To ground the ADU do as follows:
1. If the mounting base of the ADU is electrically connected to any
other ground potential than the ACU (e.g. Lightning Ground), you
must isolate the ADU at its mounting bolts with shoulder bushings
and washers - see section B.6.3.
2. However, you must establish a ground connection via one of the
mounting bolts with a separate ground cable.
3. You must route the ground cable in 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.
Bear in mind that the ADU ground connection is to be
made at the same electrical ground potential as
the ACU (see To ground the ADU).
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