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Old 06-14-2010, 06:58 AM   #1
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Tripping GFCI

Saturday my outdoor GFCI tripped and now will not stop. I replaced the outlet and it still trips as soon as I plug in the AS.
The breaker is 20 amp. I have had the AS plugged in here for nearly a year sometimes 2 AS.
The only thing new this weekend was the heat it was over 95.
The AS runs fine from my generator and a regular outlet without tripping. But it trips the GFCI even when everything is turned off.
I am thinking about putting in a 30 amp rv outlet today, but my concern is something is wrong with the AS (85 Excella)
Any thoughts?
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Old 06-14-2010, 07:07 AM   #2
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Saturday my outdoor GFCI tripped and now will not stop....my concern is something is wrong with the AS (85 Excella)
Any thoughts?
Might be an issue with an outlet or the wiring in the Excella -

Did you try plugging it in with all of the circuit breakers in the Excella in the "off" position?

If the GFCI stays on with the trailer CB's "off", turn the CB's "on" one at a time to find out which circuit gives you trouble.

On the '78 there was enough "dust" in the outlet behind the mirror in the bathroom that, when showering, enough condensation settled on the outlet that it would trip the GFCI - what a pain in the butt that was.

You may also want to check out (with a good ohmeter) if there is any resistance at all between any two prongs on your umbilical line male plug (Circuit Breakers in the "off" position). There is a good chance that some fraying may have occured in the line, or you may have some corrosion in the plug itself.
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Old 06-14-2010, 07:28 AM   #3
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So are you saying that the outlet that is popping is the one on your wall connected to your breaker box that you plug in the umbilical from the trailer?.............When you plug in the trailer it pops? What about when you plug in something else. I assume the outlet uses the special 3 prong plug that is especially for RVs? Can you use an adapter to create a regular 110 type outlet and plug something in?.........

GFIs are a pain; but try isolating if it is the trailer or the outlet.........Dennis
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Old 06-14-2010, 08:01 AM   #4
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Post 2 covers it well. In addition you might want to check any outside outlets on your trailer. They will get moisture/dirt inside and cause the same problem.
I had one occurence where I traced it down to the fridge on electric, apparently enough moisture had gotten into the insulation around the heating element, but that unit had not been run in a couple years.. GFCI plugs only require a few milliamps unbalance to trip.. Just like lawnmowers, we are making every thing so safe nothing works anymore
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Old 06-14-2010, 08:02 AM   #5
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The outlet is a regular GFCI outlet I am using an adapter at the umbilical from trailer. The GFCI does not pop when I plug in my wet vac and run it.
I just tried turning off all CB in trailer and it still pops.
So it seems like your right Dennis it must be the main cord, correct?
Also are GFCI more sensitive? Because it is not tripping a regular 20 amp with no GFCI.
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Old 06-14-2010, 10:02 AM   #6
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The GFCI is telling you you have current on your ground wire and is protecting you from a potential shock hazard. Outlets with out the GFCI do not test for this condition so they would not trip, same thing with the generator.

I guess you are using a 30 amp to 20 amp adapter to plug-in to the outlet and they do go bad my 1st guess would be to replace the adapter.

Next would be the RV cord itself starting at the plug end and look for an open (burnt) neutral (white) wire.

The best thing would be to meter between the prongs with breakers off to find the a short or open neutral.

The GFCI is a safety device so plugging into a non GFCI is not a solution to the problem.
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Old 06-14-2010, 11:29 AM   #7
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Yep I think my main plug is the problem. I'll get a new one and check back. Thanks for the help.
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Old 06-14-2010, 03:07 PM   #8
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Often the problem is a short between neutral and ground somewhere. This is probably what you're facing if the GFCI still trips with all the breakers shut off in the trailer, as soon as you plug in the shore power cord.

To diagnose this, you (or your electrician or RV tech if you haven't done this sort of work) have to disconnect the neutral wires in the breaker box one at a time, until it stops tripping. Then you have do the same thing going down the branch circuit until you find the problem. It's a pain.
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Old 06-14-2010, 05:58 PM   #9
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I guess that's where I am because I replaced the plug (which was rusted inside) and still have the same problem.
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Old 06-14-2010, 08:05 PM   #10
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If the GFCI still trips when all the breakers are in the off position isn't my problem before it gets to the panel?
Also because the GFCI is more sensitive how big of a problem do I have?
Thanks,
Kevin
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Old 06-14-2010, 08:18 PM   #11
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hi 'buff

i know nuttin' about juice but had a similar issue.

u can read about it here, there is much good advice in some of the posts.

http://www.airforums.com/forums/f37/...lks-21082.html

there are many places where a shorted neutral-ground can develop,

in my case discovery involved running EACH line (each breaker) to find the culprit.

they've got a gizmo now that will do this from the breaker box, i think.

cheers
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Old 06-14-2010, 08:32 PM   #12
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If the GFCI still trips when all the breakers are in the off position isn't my problem before it gets to the panel?
Also because the GFCI is more sensitive how big of a problem do I have?
Thanks,
Kevin
Not necessarily you could have a neutral to ground short somewhere in the trailer.

Jammer covered the way to find the problem.

One common problem is with the outside receptacle on the RV getting moisture or dirt causing a ground fault.
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Old 06-14-2010, 08:35 PM   #13
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Thanks for pointing out the thread. Looks like I have a hard problem to solve.
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Old 06-14-2010, 08:37 PM   #14
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Ok I am getting it now. Thanks.
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