[C320-list] Electrical Question

[Kurt R. Budelmann, M.D.]

My marina has GFI circuit breakers for my shore connection.  When I plug into shore power and flip on the main transom 30 amp breaker all is well.  But, when I either flip the test polarity switch to make sure it is working or I flip the AC panel breaker with every other breaker off, the GFI  shore breaker trips.  Neither of my two breakers trip.

I plugged into a non-GFI shore outlet (I swapped it in the breaker box on shore)  and everything works well.

I believe the issue is a ground problem on the boat as the current I draw when running everything except the water heater is less than 1 amp when plugged into a non-GFI shore breaker.

Has anyone else experienced this problem and any suggestions on how to fix this?

I hired the marine electrician from the largest nearby marina and he claimed that it is a problem with boats and GFI breakers.  His facility does not use any GFI breakers and they have hundreds of boats, some even over 100 feet.


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Kurt Budelmann
Everwind, Catalina 320 #1035