We had a 20 Amp Double-Pole Type CH Breaker replaced with an arc fault breaker. This was done on several breakers, no issue at the time and only issues with one now.
I've since discovered that when lights are turned on in either of 2 attic spaces the breaker trips. I'm trying to decide what to check first.
Here's the setup: From an outlet a 12/2 comes up to the attic into a junction box. From there 12/2 power goes to: -1 switch that controls 2 lights (trips breaker) -a 2 gang switches in a different attic. The 2 switches control: a light in that attic (trips breaker) an outlet in the outside soffit (does NOT trip breaker with tester plugged in)
So, I'm thinking the wiring in junction box is fine (because the outlet is fine) and there's an issue with the switch or "lampholder" simple fixture in each of the 2 attic spaces. If so I'll start by taking apart each switch and fixture to make sure they are wired correctly, no bare wire is touching the box, etc.
Am I on the right track? Thanks!