We recently upgraded the service on an older house. The City requires us to put arc fault protection on the bedrooms. We did on 2 out of 3, but 1 circuit wouldn't hold on the arc fault. The inspector won't pass the job until that circuit gets an arc fault breaker. I'm sure somewhere on the circuit someone at some time tied the neutrals from another circuit to it, but it could be something else.
Does anyone have a tip on how to find problem without rewiring the house?
