Hi, I installed a specialty appliance on the driveway and need to supply a gfci circuit to it.

Here is the issue: The main panel in the house is a Square D panel. I had added gfi breakers to it(2- 15amp) but later, after issues with popping breakers found a paper listing Square D, Technology Research Corp, and Vista as failing the manufacturers load(suitability) tests. The breakers that passed testing are Siemens QPF and Murray MP-GT.

I have been trying to find a way to add a sub panel or replace the cut off box (outside) or even to find a 240v GFI outlet. The Main lug panels have different style lugs than the GFI breakers and I haven't been able to find anything that will resolve my situation.

If I replace the outdoor cut off box with a spa box it will have GFI breakers but rated at 50 or 60 amps. Is this OK? I do have regular 15 amp breakers in the main panel feeding the circuit. Is there a spa type panel available with 15 amp GFI breakers?

My thought is the 50 amp GFI breakers will act as fault trips and the main panel will control the circuit with the 15 amp breakers. I'm asking because I really want to get this right, if you know what I mean.

First question... Did you say you are using 2 120 volt gfci to make the 240 volt circuit? If that is the case, it's a big no-no and against code and against good logic. A tandem breaker is the only way this would be acceptable... can you elaborate on "special appliance"? Can it be hardwired?

Hi MB, This is a compressor, 240v 1ph 60hz on a 15amp circuit from the main panel. I have a fused cut off box located outside. It is all hard wired.

Yes, I did use 2- 120v GFI breakers in the main panel.

You must use the tandem breaker... period. If just one of your two breakers should trip, the motor would still be energized. And if it's hardwired, why do you require a gfci?