A few months ago I came home and turned on a light switch with no result. Checked the breaker panel and found the a lighting circuit breaker tripped. It reset with no issue.
A few days/weeks go by and the same thing happens again. This time the breaker can't be reset. Waiting a few hours or until next morning allows the breaker to be reset. At the present time the breaker was able to be reset but after turning on lights on the circuit it popped again (can't definitively tie it to a particular light or switch). I'm leaving it off.
Each time this has tripped no lights have been turned on and nothing has been plugged into the lone receptacle on the circuit.
I tightened the screws on the breaker at the panel, no joy. I swapped the wire to a different 15A breaker and that tripped also, so I think the breaker is ok.
I checked the wiring and the connections at the only receptacle and that seem good.
I can check all the switches and see if the connections are tight and look for shorts there.
Items on the circuit: Fluorescent ceiling and closet lights, one receptacle, one exterior flood light with a motion detector.
Question: Does having a light switch off isolate the associated light fixture from the circuit for trouble shooting purposes or do I physically have to disconnect the wires at the light fixture to see if that fixture is causing a short?