Alternative grounding for steel hulls
98-133966-G1 Appendix F: Grounding and RF protection F-3
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Grounding and RF
F.2.2 Grounding the ADU
You can ground the ADU to the ship/hull via one or more of its
mounting bolts. Make sure to remove painting, dirt, grease etc. at the
mounting holes in order to make good electrical contact to the hull. 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
1
. 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.
F.3 Alternative grounding 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.
F.3.1 Grounding the ACU
The ACU should preferably be grounded to the ship with the short
cable. Further, the ACU must be grounded at its grounding stud in order
to ensure a proper grounding if the short ADU cable is disconnected.
Figure F-2: Grounding the ADU
Antenna bottom
Mounting base
M12 bolt
Serrated washer
(stainless steel)
(stainless steel)
Note
For optimum grounding use the mounting bolt located closest to the ADU cable
plate, see Grounding the ADU on page 3-22.
1. Please note that the ADU ground connection is made at the same
electrical ground potential as the ACU.
SAILOR900TM.book Page 3 Monday, September 16, 2013 11:01 AM
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