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Old 21-09-2014, 09:13   #1
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Location: Southern Chesapeake Bay
Boat: Norseman 430, Jabberwock
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Shore Power Question

I have single 30 amp service on my boat. From time to time I have to plug to a 50A 125/250V receptacle, for which I have the proper adaptor.

The question just came to my mind whether with this setup I am still protected by a 30 amp breaker on the dock.

I'm thinking that the 50A 125/250/V has two 30 amp circuits, of which I'm connected to only one, so I'm protected like I would be plugged into a 30A receptacle.

I'm very mindful of my electrical limitations, so can someone confirm, or correct?
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Old 22-09-2014, 09:36   #2
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Re: Shore Power Question

No you are connected into a 50a circuit with a 50a breaker

You are required to have a Double pole 30a breaker within 10' of the plug on the boat. So the boat would be protected by this. The shore cord itself and wire between the shore plug and your boat breaker would be unproperly protected. But the chances of something happening with a proper breaker on board is limited. As most Likly you'd either get a short in wiring which would still blow the 50, or you exceed 30a and blow the onboard breaker
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Old 22-09-2014, 19:46   #3
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Re: Shore Power Question

OK, I have such a breaker close to the plug on the boat.

But, reading between your lines, if the wires are sized for 30 amps, and there is a short prior to the 30 amp breaker, it seems like there could be problems.

Is this correct?
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