Blows 30 Amp shore power breaker - SailNet Community
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post #1 of 10 Old 06-15-2015 Thread Starter
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Blows 30 Amp shore power breaker

When keeping the sailboat at a marina ware it was stored the electric was fully operational. After moving it to a yacht club it seems to blow every breaker in the place. I have tried plugging in at different slips and still have the same problem. I have tried to segregate the problem starting out with the battery charger and then moving on to a GFI outlet.
Something I do not understand that when all the 110 breakers are off and the main breaker flipped on it will blow the shore power breaker ???????
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post #2 of 10 Old 06-15-2015
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Re: Blows 30 Amp shore power breaker

sounds like reverse polarity problem . you need to make sure neither of the hot wires ( black or white ) are grounded. in a house the white and ground are common but in a boat they are not. or you have a short in the main breaker. is the main breaker in the boat a double pole breaker? try switching the white and black wire comming from the power plug that connect to the main breaker.

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post #3 of 10 Old 06-15-2015
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Re: Blows 30 Amp shore power breaker

Check the cables and connections from the boat to the shore. If your breakers on the boat do not blow, it is the connection from shore to the boat.
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post #4 of 10 Old 06-15-2015
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Re: Blows 30 Amp shore power breaker

Just so you know, new regulations for Ground Fault Circuit Interrupters (GFCI) and Equipment Leakage Current Interrupters (ELCI) mean that new installations at marinas (and all in some states) have a lower threshold of leakage before the circuits trip. You might be leaking current. If you have or can get hold of a clamp-on ammeter, the sum of the current through the cord should read zero if no current is leaking.

I posted an article about this a couple weeks ago, and it has a few links that go into detail: Why is my shore power tripping the receptacle? located in General | Waterway Guide News Update

Hope this helps, and hope you figure out the issue.

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post #5 of 10 Old 06-15-2015
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Re: Blows 30 Amp shore power breaker

Has corrosion in the power cord ends been eliminated? Also where it plugs into boat.
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post #6 of 10 Old 06-15-2015
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Re: Blows 30 Amp shore power breaker

A GFI will trip due to a lot of conditions that will not bother a regular breaker or power supply. A GFI measures current lost to ground, not to a neutral or reversed polarity. Humid conditions, water in any junction or device in the circuit will cause a GFI to trip. The easiest way to determine where a ground fault is located is to turn everything off and restore power one circuit at a time until the GFI trips. Something on that circuit is the problem. If it trips with everything off or disconnected you have a problem with your cord or distribution panel. Someone with a good multimeter should be capable of determining where the fault is.
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post #7 of 10 Old 06-16-2015
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Re: Blows 30 Amp shore power breaker

javogs,
I'm not a big drama fan, but sometimes AC power just scares the everloving *rap out of me and I'd prefer it wasn't around.

This might be a good time to roll up your sleeves and start laying eyeballs and fingers on your AC system, from the inlet (and of course there's a master breaker or GFI within the specified distance of that?) at least up to your master AC breakers and distribution panel. Label it, diagram it (old fashioned pencil & eraser are great, they're waterproof too), somewhere in there you will find something is not quite right.
Maybe a wire strand making a ground where it shouldn't, or a corroded connection, but SOMETHING is pissing off all those breakers, and when there's a cranky kid on the AC wiring system, that's the kind of thing that turns into a nasty fire, fast.

This could of problem could be a blessing in disguise. Once you find it, take yourself out to dinner or buy a good one to bring in and celebrate. Really, it gives you something to look forward to while you're doing all the tedious work in cramped places.
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post #8 of 10 Old 06-16-2015
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Re: Blows 30 Amp shore power breaker

Shore power is a PITA. if you are unsure get someone that knows ac electric. the Main on the boat panel is wired so a "hot" ground/neutral will trip the breaker. if the shore power on the dock is tripping it may be the other place you came from was less up to date on service power

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post #9 of 10 Old 06-18-2015
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Re: Blows 30 Amp shore power breaker

if you are popping a 30-amp breaker, GFI or not, and every secondary breaker on the boat is turned off, you have a dead short somewhere in the main system. It's that simple. Now, it could be your dockside cable, and it could be your main breaker (they both go bad sometimes.) If you know nothing about electricity, hire a licensed electrician and have that person methodically go through the entire circuit. It might cost you a hundred bucks or so, but it's better than having that short do some serious damage via a fire.

All the best,

Gary
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post #10 of 10 Old 06-24-2015
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Re: Blows 30 Amp shore power breaker

OK jav, time for an update. What was the problem? Waiting to learn.so that I become more knowledgeable
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