kevcard
Member
- Location
- New Jersey
First off I got to say I have been reading here for awhile now. I got some very good info and advice so with my first post I need some help.
I went on a service call this week. The customer calls with a dishwasher tripping the breaker. The house is less then 2 years old. There are two dishwashers in the kitchen. They are wired on a MWBC (12/3 NM to a junction box with 12/2 going to each dishwasher). Only one dishwasher was tripping a breaker. I put an amp probe on the circuit. That was normal. Voltage was normal. I check insulation with a Megger. All wires checked open. The only thing I could find was that when I shut off only one circuit, I would have 24volts on it. I reversed that and shut the other circuit off and turned the first circuit on and would get 24 volts on the dead circuit again. I just figured that was an induced voltage I was reading. So I went out to the panel and swapped the wires and told the customer to call me when it trips again. I wanted to see if it was the dishwasher. Well I got the call. The other dishwasher is tripping now. So it is in the circuit somewhere. I asked if both dishwashers were running when the breaker tripped.
They said they were. Any ideas?
I went on a service call this week. The customer calls with a dishwasher tripping the breaker. The house is less then 2 years old. There are two dishwashers in the kitchen. They are wired on a MWBC (12/3 NM to a junction box with 12/2 going to each dishwasher). Only one dishwasher was tripping a breaker. I put an amp probe on the circuit. That was normal. Voltage was normal. I check insulation with a Megger. All wires checked open. The only thing I could find was that when I shut off only one circuit, I would have 24volts on it. I reversed that and shut the other circuit off and turned the first circuit on and would get 24 volts on the dead circuit again. I just figured that was an induced voltage I was reading. So I went out to the panel and swapped the wires and told the customer to call me when it trips again. I wanted to see if it was the dishwasher. Well I got the call. The other dishwasher is tripping now. So it is in the circuit somewhere. I asked if both dishwashers were running when the breaker tripped.
They said they were. Any ideas?