Adding two new 20a AFCI circuits to a basement project. I tied the circuits to the breaker panel and all outlets test out ok with a tester.
The second I put any load on either circuit, however, BOTH breakers trip.
I ran out of time to troubleshoot so left them turned off. My only guess is that I may have accidentally reversed the neutral wires on the AFCI breakers introducing a bridge between the two circuits.
If that's not it, what else could be causing both circuits to trip on load?
I'll be back tonight for more troubleshooting.