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Should Smoke Alarms Be on Lighting Circuits?

jar546

CBO
Joined
Oct 16, 2009
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Not where I really want to be
In our municipality, we adopted Section K111.6 of Appendix K from the Florida Building Code (same language as in the IBC), and I think more jurisdictions should consider doing the same.

K111.6 Smoke Alarm Circuits:
Single- and multiple-station smoke alarms required by this code and installed within dwelling units shall not be connected as the only load on a branch circuit. Such alarms shall be supplied by branch circuits having lighting loads consisting of lighting outlets in habitable spaces.

This isn’t about nitpicking the NEC or adding burdens. It’s about life safety. When a smoke alarm is on its own dedicated circuit, it can quietly lose power—whether from a tripped breaker, a bad connection, or someone turning it off and no one knows. That alarm becomes nothing more than a piece of plastic on the ceiling.

When it’s tied to lighting in a habitable space, if that circuit loses power, someone notices right away because the lights stop working. It’s a built-in warning system.

And let’s be honest, people are quick to disconnect the battery when a smoke alarm starts chirping. If the hardwired power is also out and no one knows, they’ve just disabled the only thing protecting them while they sleep.

This code section closes that loophole. It’s simple, inexpensive, and smart.

Anyone else out there adopted this provision? Would your jurisdiction consider it for the greater good?
 
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