A bit of a segway here but I saw a very interesting post on another forum today. The question was why are smoke detectors in a bedroom required to be on afci. We have seen tons of those questions before. What was unique about this one was the poster brought up the fact that in his smoke detector circuit none of the smoke detectors use the ground wire. And we know the ground wire is the real main component in the working of an afci breaker because it has a built in gfci. I guess the answer is because the branch circuit itself has the ground conductor and the branch circuit is therefore "protected" regardless of the device itself not being "protected" by the afci. Any thoughts?
