Alternative ground for steel hulls
B-4 Appendix B: Ground and RF protection 99-145912-A
B.2.2 To ground the ADU
To ground the ADU do as follows:
1. Ground the ADU to the ship/hull via one or more of its mounting
bolts.
2. Make sure to remove painting, dirt, grease etc. at the mounting
holes in order to make good electrical contact to the hull.
3. Use serrated washers when securing the mounting bolts and seal
the joint with protective coating to avoid corrosion.
It is always recommended to establish the shortest possible grounding
path e.g. on steel hulls the ADU should be grounded directly to the hull
2
. However, due to the fact that this is not possible on e.g. fibreglass
hulls (nor is it preferable on aluminium hulls) a number of alternative
grounding methods are suggested in the following paragraphs.
B.3 Alternative ground for steel 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.3.1 To ground the ACU
To ground the ACU do as follows:
1. Ground the ACU preferably to the ship with the short cable.
Figure B-2: Grounding the ADU
Antenna bottom
Mounting base
M12 bolt
Serrated washer
(stainless steel)
(stainless steel)
For optimum grounding use the mounting bolt located closest to the ADU cable
plate, see To ground the ADU on page 3-22.
2. Note that the ADU ground connection is made at the same electrical
ground potential as the ACU.
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