Originally Posted by FF
"Very clear explanation. I don't understand the op's reluctance to have the gen green ground wire permanently wired to ship's ground as the standards call for."
Ground wires , are connected to neutral wires .
Neutral wired carry some current esp in a 120v setup split from a 240v source (USA) .
The reluctance to induce even minor ac current is to keep down the chance of electrocuting a swimmer , and not add a corrosive load to any underwater metal.
All the current flowing in on a black wire 120vac must cycle back, return on the white wire. If there is ANY current flowing on the ground safety wire, it would trip a GFCI, so that is not good to have current flowing off the white and black wires.
GFCI and ELCI will sense the difference and turn off the power.
I have a tight AC system, I can run a GFCI on the 30 amp twin inlets, but I dont. Only the microwave and all the outlets are on GFCI.
IMO,FWIW, It is a good idea to have a tight system that does not exceed that 5 milliamp level of current leakage. ELCI is 30 milliamps. I dont have these nuisance trips people talk of on boats when using a GFCI on the shore line.
And the shore power pedestal should be the required location of GFCI or ELCI not on the boat. Is that not how Europe does it?
I have had shore power cords get damaged by whacking, getting pinched accidently, I suppose between boat and dock, and then leak current into the water. An ELCI on the boat wont help that at all. That cord, when I cut it open, had dissolved into the water 6 feet of copper wire, and was hot. A small hole existed in the yellow vinyl cover. Stuff happens that you do not expect..