So I need some help (again) with an electrical issue.
I wired the basement and due to some new building code all the breakers are AFCI (which I am suspecting is a part of the problem). In the bathroom there 3 light switches, labeled 1,2 & 3 on image, switch 1 directs to a pot light and an led light, switch 2 goes to a vanity light and 3 is a fan.
For months we haven’t been able to use switch 1 because it will trip the breaker, not always immediately, but usually within 30 seconds. I spent all week trying to solve it, I went into the device box and cleaned up the wires for the switches as best I could making sure nothing was exposed, I replaced the switch (from another one in the basement so I knew it worked). This all improved the issue slightly, in that it took a while longer to trip.
We kept thinking we had solved it and then short time later it would trip again, here is where it gets weird… we discovered an almost surefire way to make it trip was to have both light switches on (1 & 2) and then turn off switch 2 (ie the one that hasn’t been a problem); switch 2 being turned off would kill the breaker as long as switch 1 was on. I pulled out all the lights tested different combination of wiring, such as one light being bypassed or cut off and this more or less holds true. Except now I find it takes the light a few minutes to heat up or whatever before turning off 2, while 1 is on, will trip the breaker.
Anyways there is not a lot of load on the circuit, a tv and SMALL deepfreeze and two lights that are rarely on (pantry).
Also I could just swap out the afci break for a regular since the inspector has come and gone