The AC grounding is as simple as attaching the ground wire
from the dual pole circuit breaker to the DC ground bus.
The same bus the
engine ground connects to.
We already have a Galvanic Isolator.
"AC Ground
See Practical Sailor August 15, 1995 for a detailed treatment of the green wire. The best solution is a heavy and expensive isolation transformer. The acceptable solution (for the rest of us) is to install a light and inexpensive Galvanic Isolator in the green wire, between the shorepower cord socket on your boat, and the connection to the boat's AC panel. Then, connect the grounding conductor (green) of the AC panel directly to the engine negative terminal or its bus.
It is also a good idea to use a Ground Fault Circuit Interrupter (GFCI) in your AC wiring. GFCI's will occasionally "nuisance trip" due to the humidity surrounding the wiring on boats, but the additional safety that they offer (particularly to nearby swimmers) in disconnecting power in the presence of ground currents is worth the nuisance. If your GFCI starts to nuisance trip, it is probably a very good idea to track down and clean up your damp wiring in any event."
The West Advisor: Marine Grounding Systems
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