In my mother in laws mobil home, she has a 30 amp breaker that trips intermittently. The curcuit goes to a single heating element in her furnace. I have measured the voltage drop across the heating element and it is comparable to the element next to it on a different circuit. I have swapped the breaker with another one in the panel. I have seen the breaker trip after I disconnected the two wires at the furnace. I then disconnected the white wire from the breaker output and it still blew, then I disconnected the black wire from the CB output and it didn't blow. The furnace ran fine all night last night then the ckt breaker tripped this morning. I am stumped...any suggestions?
Bill McMullan
Waxahachie, TX.
It sounds like this circuit breaker is worn out and needs to be replaced. good luck
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When the unit is running grab the cable where it comes out of the panel box;does it feel hot? If it does you have excessive resistance.
Disconnet the wire from the breaker and scrape the surface of the wire with a knife. Does the copper scrape off exposing an aluminum core? If it does replace the wire.
With the power off and the wire disconnected from the breaker and the furnace, measure the resisitance from end to end in the wire.
In a house trailer the run can't be very long so you should only see a couple ohms resistance in any wire.
Please let me know what you find?
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