Training, Installation & Service Manual - Livewire Connections Ltd

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.
The ground connection can be established either at the hull
(recommended) or at a dedicated RF ground if available
(alternative).
Importan However, bear in mind that the ADU ground
connection is to be made at the same electrical
ground potential as the ACU (see Grounding the
ADU).
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.
F.3.2
Note
Grounding the ADU
Alternative grounding for steel hulls
For optimum grounding use the mounting bolt located closest to the ADU
cable plate, see Figure 3-22: ADU, bolt for optimum grounding on page 3-22.
FFFF
Grounding and RF
F.3.2.1
Terminal grounded at the hull (recommended)
In this case the ADU is grounded to the ship 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.
98-133966-E2 Appendix F: Grounding and RF protection F-5