"Kurt Ullman" wrote in message
...
I have some 20 y/o hard-wired smoke detectors that I want to replace
with newer hard-wired ones. How do I figure out which circuit breaker to
trip or is this an issue with smoke detectors?


I trip the one marked "smoke detectors". If your breakers are not marked,
spend some time doing so on all of them. My detectors have a red LED that
goes off when the power goes off so it should be easy enough to find going
breaker by breaker while someone watches. If yours do not, hook up a tester
very carefully. .