I have a 20 amp circuit that goes to my barn and garage and the breaker is tripping even when nothing is turned on. I can run the garage doors and turn on the lights and it does not trip. I check the next morning and it is tripped. I can't seem to get it to trip while things are running just when the circuit is idle?
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Breakers can trip from short circuits and overloads.
From what you describe, it is not overloaded (it is idle). An electrician can verify this with a ammeter.
A short circuit can be caused by water to a damaged or improperly installed wire. (an electrician can verify the wire is okay with a megger).
In the morning is there a dew? Has it rained? Can water be getting into the electrical boxes?
Is it possible someone is using the circuit overnight and tripping it out on overload?
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