Breaker to unused outdoor GFCI receptacle trips
I have a 20 amp circuit breaker, which serves one GFCI outdoor receptacle, that keep tripping. I heard a pop within the receptacle and the breaker tripped. I reset the breaker and noticed the GFCI did not trip, just the circuit breaker. This GFCI was unused at the time. I replaced the GFCI, but the problem remains. When I reset the the breaker, it takes about 5 minutes before the breaker trips again. Any ideas?