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Arc fault breakers

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cracker:
So the new house has all Arc Fault breakers.. we seem to be having issues with multiple circuits where the appliance will be running for an extended amount of time and then the breaker trips.  One of the house techs says that the arc fault breakers are just too sensitive and are junk, but does not think the factory will replace them.
Happening on multiple circuits.  I have plugged 2 different coffee makers into 2 circuits and they will brew fine and then sit there for almost 2 hours(sometimes shorter sometimes longer) before tripping the breaker.  We also have a portable A/C unit that is doing the same thing on other circuits.

Just trying to get some other peoples opinions(and build my knowledge) before I start battling with the manufacturer.

mr.mindless:
throw an amp clamp on the load wire. if it's tripping at less than rated load that's the end of the story IMO.

Wingman:
They are a pita, for sure. And expensive. Could replace with normal breaker and see if it continues?

cracker:
it is hard to know when to watch when it takes random time for them to trip

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