Alternative ground for steel hulls
99-145912-A Appendix B: Ground and RF protection B-5
2. Further, ground the ACU at its grounding stud in order to ensure a
proper grounding if the short ADU cable is disconnected.
3. Establish the ground connection either at the hull (recommended)
or at a dedicated RF ground if available (alternative).
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.3.2 To ground the ADU
Terminal grounded at the hull (recommended)
In this case the ADU is grounded to the ship via one (or more) of its
mounting bolts.
1. Make sure to remove painting, dirt, grease etc. at the mounting
holes in order to make good electrical contact to the hull.
2. Use serrated washers when securing the mounting bolts and seal
the joint with protective coating to avoid corrosion.
Terminal grounded at a dedicated RF ground (alternative)
In this case the ADU is grounded with a separate ground cable.
1. Route the ground cable parallel and close to the shielded coax cable
connecting the ADU to the ACU grounding kit.
2. You can use a heavy gauge wire with tinned strands (min. 6 mm
2
)
for this purpose.
However, bear in mind that the ADU ground
connection must be made at the same electrical
ground potential as the ACU (see To ground the
ADU on page B-5).
For optimum grounding use the mounting bolt located closest
to the ADU cable plate, see To ground the ADU on page 3-22.
The ADU must be electrically isolated at its mounting bolts
by means of shoulder bushings and washers ensuring the
isolated RF ground - see Isolation of the ADU from the
mounting base on page B-12.
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