wiring for smoke detectors

jaansuFebruary 27, 2010

I have three communicating smoke detectors which I wish to replace and add on 8 more to protect more rooms. I notice that the circuit the three are on is also connected to a single three way stair light fixture. From what I've heard, smokes should be on their own circuit. No there's no easy way to take the light out of the circuit. Anyone know if this really is a problem to leave the light on the same circuit?

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groundrod

There is no problem with having the light on the same circuit.

    Bookmark   February 27, 2010 at 12:19PM
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steve_fl

In fact it is probably better that the light is on the circuit-
It will be noticed if the light does not work, and possibly be a tripped breaker.
With only the smokes on the circuit, if the breaker trips, you may never know!

    Bookmark   February 27, 2010 at 2:06PM
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bus_driver

Many codes require the smoke detectors to be on a circuit with important lighting fixtures so that one would not turn off the circuit and leave it that way. Rather than the NEC, these codes are building or safety codes.

    Bookmark   February 27, 2010 at 5:57PM
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groundrod

With the smoke alarms required today you should know if the ac power is lost because the battery backup will beep to let you know if either the ac or battery power is lost it will beep.

    Bookmark   February 27, 2010 at 6:01PM
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hendricus

Right, but, say you're gone on vacation and the circuit goes out, beeping starts and wears out the batteries. You come home and the circuit is out and batteries are dead and you don't know it.

    Bookmark   February 27, 2010 at 11:04PM
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