Hi,
Electricaman-Good morning.

In my area it varies depending on where you are doing the work. This particular location is in the boonies. No zoning, no permits no nothing..

Now if I am in the city or other place that is within a jurisdiction of some kind then yeah it is a good idea to brush up on the regs.

Even if I know the answer to a question I will sometimes run it through ecn to get some feedback. That helps because I do not know everything!

Why would the feeder fpr the smokes have to slave from a single branch circuit that is feeding other stuff? If that circuit trips and no one knows it then what?

Battery backup?

I always put mine on a lighting circuit and feed it from a ARC Fault. This covers the bedrooms.

Thanks for the replies.

Greg