[firelient]

Ok Members Here's the service call I got today. 200A CH panel with a GFCI breaker on "A" phase that feeds two Bathrooms, got an 20 space 100A sub panel on other end of house feeds Kitchen area mostly,got an microwave on "A" phase of sub panel Only thing on that Circuit. Most every time you turn microwave on the GFCI in main panel trips. plug microwave into another circuit "GFCI outlet" it workes ok. Solved by Moving GFCI to "B" phase in Main panel everything ok. All wires tight, proper ground,.So what am I missing why would a GFCI in an unrelated area trip, HELP!! Thanks

 

[mes2012]

Very Strange, Sure the neutrals of those 2 branch circuits are not spliced together in a Jbox somewhere and/or the neutral bar in the sub panel is isolated back to the main... thats the only thing I could think of...