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30amp GFCI
We are at a fairgrounds that installed new temporary power posts. All have 30amp GFI–protected circuits. When we plug our 50amp-to-30amp adapter into the outlet it trips the circuit breaker. Is this an issue with the bus electrical system or the fairground power post?
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22 Replies
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You are using a 50 amp to 30 amp adapter?
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Yes. A 50amp female to 30amp male pigtail
Jeff and Lindsay
91 Marathon XL -
Ok trying to get some of the obvious things out of the way first. You have everything turned off as to not pulling a load when you flip the breaker on the pole on? Sometimes the pole can be the issue, did you check the pole voltage?
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
No load when turning on the breaker. 120 volts at the 30 amp GFI outlet. I have frequently plugged the rig into a standard 30 amp outlet with no problem. I am wondering if the engineering behind a 30 amp GFCI breaker reacts differently with our 50 amp systems. Other Prevost owners have reported similar failures.
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Is that a Factory adapter?
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I was not aware there was a factory adaptor. I believe I purchased mine from Camping World.
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On my bus I have all the adapters and can plug into a 15 amp outlet. as long as my internal draw is less than my power source i am ok. Does your bus have a polarity warning light? Are you tripping the Breaker or the GFI?
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
I frequently use a 50 to 30 Amp adaptor then plug into a 15 or 20 Amp plug. Having said that, I have NEVER been able to plug into a GFI circuit it always trips.
I recently purchased a 50 to two 30 Amp Y adaptor. It had a large label on it stating it will not work if plugged into an outlet with a GFI.
A lot of marinas are upgrading to GFI’s and most boats can not plug into them. There’s a storm a brewing on the horizon with local electrical codes requiring any changes or upgrades to systems to change to GFI’s. They are to sensitive and will not accept adaptors.
Chuck
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Try plugging your adaptor in by it’s self. The adaptor connects the two hot legs together. That is more than likely what causes the GFI to trip
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A GFCI is likely an issue with any conversion unless there is some provision for connecting the ground before supplying power to the other legs.
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
No polarity warning light. The GFCI is built into the circuit breaker in the main electrical panel.
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
I carry a regular non GFI outlet, with the host permission I remove the GFI and install the regular outlet during my stay. Works perfect. Reinstall GFI upon departure.
Chuck
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Make sure your inverter charger, shore power setting is set below 30amps I would set it at 15amps no electric heaters on, water heaters-aqua hot electric side
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Yes, that would work. Unfortunately, in this instance the GFCI is built into the circuit breaker in the main panel.
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Thank you to everyone who has commented. I am convinced that our coaches are not compatible with a GFCI protected power source. As Chuck indicated, this problem may get worse as power sources are upgraded to include this safety feature.
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