On Sun, 31 Jan 2021 17:15:02 +0000, Mattinstafford
wrote:

I've tried every circuit breaker in the house except.for the master and the smoke detector has remained hot. I suspect that my smoke detectors are wired together but supplied by two different circuits so that they will go off together. I'm simply going to cut power to the whole house to change the hard wired units rather than try to solve a very complicated puzzle.

Hot like 120v present or just functioning? They usually have battery
backup. If they really are being fed from 2 circuits, fix that first
or you might be needing those smoke alarms.