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Old 07-21-2020, 08:21 AM   #1
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GFI Tripping

Has anybody figured out why some coaches will pop the GFI on the shore line when plugged into 20 amp GFI plug. It will run on standard 20 amp plug just fine......

Thank you
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Old 07-21-2020, 08:28 AM   #2
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My coach had the ground and neutral wires reversed as the power entered the coach. It would pop the shore power every time, and sometimes do weird things, like power only half the coach at some RV parks. It took me 3 years to finally get frustrated enough to dig into the rear panel and find the cross wire problem!
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Old 07-21-2020, 08:43 AM   #3
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It will run on a standard outlet but all may not be fine with it, if it trips a GFCI.

In some cases, the inverter/charger has a neutral to ground, bonding relay, that doesn't open that bond fast enough for the GFCI.

Some water heaters leak current between ground and neutral, if damaged, causing a trip.

Some fridge ice makers have the same current leak.

I believe that many surge protection devices may also trip up the GFCI during its testing routine.

I'm sure there are more things that trip them up. Things like add on chargers or battery maintainers.
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Old 07-21-2020, 07:26 PM   #4
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It is most likely a ground neutral problem, or what is seen as a short when a motor starts. Also, GFCI's do go bad.

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Old 07-21-2020, 08:02 PM   #5
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I did. My extension cord had the hot and neutral reversed.
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Old 07-22-2020, 08:57 AM   #6
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If it is not a cross wire, you can test the appliances on the coach by turning all the breakers off, and then back on one at a time to see which is causing the trip. Or, do the opposite way by turning the most likely circuit breaker off for a while to see if there is a trip. Give plenty of time for the appliance to come on before deciding on each circuit.
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Old 07-22-2020, 09:48 AM   #7
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Switching off breakers disconnects the hot ( black ) wire.

The neutral of that breaker feed is still connected and if it's leaking to ground, you still have a ground fault. Ground faults don't need power to cause a trip.

Pulling a plug OR disconnecting the white neutral wire at the appliance is the best way to hunt down a ground fault.
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Old 07-22-2020, 11:19 AM   #8
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Thank you for all the info... I will start trying things...

Safe travels
Dave
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