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Old 03-23-2014
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Circuit Breaker

I'm replacing some wiring and the circuit breaker for my shore power 115 outlets. I found the breaker I need at West Marine but they offer any where from a 5 amp to a 50 amp. Not sure witch one I need. I'm guessing the 30 amp but not sure. I just purchased the boat so I'm unfamiliar with it, also several hours away from it so I cant just go look. Its a Watkins 29 if that helps. Thanks
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Old 03-23-2014
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Re: Circuit Breaker

most likely it's 30 amps, but I'd make sure before doing anything.
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Old 03-23-2014
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Re: Circuit Breaker

I doubt it is anything but 30 amps. Make sure it is a double pole breaker that breaks both hot and neutral wires.

Like this: C-Series White Toggle Circuit Breaker - Double Pole 30 Amp - Blue Sea Systems
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Old 03-23-2014
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Re: Circuit Breaker

You have just one breaker for the whole boat? If so, I would think carefully about allowing all 30 amps to go to AC outlet.

Check the gauge and other specs of the smallest wire in your system. Then do some searching online for what amps it will carry safely. If your outlet is connected with 14 AWG, I would make the breaker 15 amps or less. If you have a panel that splits the current among multiple circuits, you might do 30 amps for the whole boat (master breaker), but then split that into multiple circuits that match the gauge of the wire and rating of the outlets.

I believe that "standard" AC outlets are 15 amp maximum. 20 amp outlets have a "T-shape" hot slot that accommodates the special plugs that 20 amp appliances require.

DISCLAIMER: I am not an electrician. Verify anything I say with a qualified source. (Free Internet advice may be worth less than you pay for it.)
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Re: Circuit Breaker

A proper shore power panel for 30 amp service has a double pole breaker (30 amp) as a main breaker with other breakers for each circuit, usually 15 amps, each wired with 14 gauge wire. The wire from the shore connection to the panel is 10 gauge wire. The panel includes reverse polarity indicator lights. This is a good example of a proper panel.



Many older boats came with just a single double breaker of 30 amps and that should be corrected so any individual circuit cannot draw more than the current it is rated for, typically 15 amps. I would think any good surveyor would consider this a requirement.
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Old 03-24-2014
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Re: Circuit Breaker

Ok I think I was about to screw up. I was getting ready to order the 30 amp. This breaker only controls the 115 shore power outlets. Maybe I should wait till my next trip down and pull it and then order.
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Old 03-24-2014
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Re: Circuit Breaker

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Originally Posted by nccouple View Post
Ok I think I was about to screw up. I was getting ready to order the 30 amp. This breaker only controls the 115 shore power outlets. Maybe I should wait till my next trip down and pull it and then order.
For an individual circuit you want a 15 amp breaker. Blue Seas model # 7210 or similar.

A-Series White Toggle Circuit Breaker - Single Pole 15A - Blue Sea Systems
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Re: Circuit Breaker

You have two circuit breakers but no 30amp main ????
Is the polarity indicator wired across both circuits ?
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Re: Circuit Breaker

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You have two circuit breakers but no 30amp main ????
Is the polarity indicator wired across both circuits ?
I'm assuming the double pole main is above the reverse polarity light. There certainly has to be one.
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Re: Circuit Breaker

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Originally Posted by mitiempo View Post
I'm assuming the double pole main is above the reverse polarity light. There certainly has to be one.
I'd hope so but in my experience I wouldn't bet on it
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