Appendix C: Grounding and RF protection
TT-98-129218-A
Separate ground cable
65
Separate ground cable
Ground cable - construction
When dealing with electrical installations in a marine environment, all wiring must be done with
double insulated, tinned, high quality and if exposed also UV resistant cables. This shall also apply
to the separate ground cable mentioned in the previous paragraphs.
The ground cable is constructed using an appropriate cable with a cross section area of at least 6
mm
2
(AWG10) and terminated with insulated ring crimp terminals – see illustration below. The
crimp terminals must be a marine approved type e.g. the DuraSeal series from Raychem.
Ground cable - connection
The ground cable must be mounted parallel (and in close proximity) to the shielded coax cable
thus minimizing ground loop problems. If possible, route the coax cable and the ground cable in
metal conduits bonded to the hull or within a mast (depending on the actual installation).
The ground cable must be connected at one of the mounting/grounding bolts on the antenna. Use
bolts and washers of stainless steel and seal the joint with protective coating to avoid corrosion. If
the antenna is to be isolated from the mounting base, shoulder bushes and washers must be used
- see page 67.
Antenna:
M10 Insulated Ring Terminal
(Raychem, DuraSeal Series )
Terminal:
M4 Insulated Ring Terminal
(Raychem, DuraSeal Series )
