SailplaneDriver

3 electricians looked - no idea. Swapping brands of GFCI breakers does seem to help reduce the frequency. A 1p plasma cutter can trip GFCI's in the shop panel but I assume that is capacitors charging or leakage to ground from what I am cutting.

Any thoughts?

Thanks,

Ken

Hi. I have a main house panel which feeds a house sub panel and a barn sub panel which feeds a shop sub panel. Turning on my rotary phase converter (all equipment isolated by disconnects), it will often trip 1 or 2 GFCI's only in house sub panel. To be cont.