OK, it's happening to me also. I just finished wiring my panel and when I plugged it in to a GFI outlet in my garage, it tripped. Thing is, ALL my breakers were
OFF (main and others). I tried a different GFI outlet in the kitchen, same result. I tried using the cord with another appliance and it did not trip the GFI. The GFI only tripped when I plugged to cord into the power inlet. I plugged the power cord into a non GFI outlet and everything on the tear worked fine. I used an outlet tester (similar to the one below) to test all the outlets and cord and everything checked out fine. I checked the box and all the grounds are hooked to the ground bar, all the neutrals to the neutral bar and the hots to the breakers. I can't figure out what is wrong. (The box is not grounded to the frame.) Like Steve said, there aren't any GFI outlets in campground boxes but there must be a problem I need to fix.
