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wired smoke alarm from subpanel deans@wdeans.com 06-16-2005
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Posted by deans@wdeans.com on June 16, 2005, 2:29 am
Greetings,

Is there any rule which states not to run 120V wired smoke alarms from
a subpanel? I could see someone saying that the breaker to the
subpanel might flip leaving the smoke alarms with no AC power. Is this
a real concern addressed within the NEC or fire codes? Or can I just
run it off the subpanel and forget it because code doesn't address the
issue?

Thank you for your time and energy,
William


Posted by RBM on June 16, 2005, 7:11 am
William, the importance of a smoke detector is that it be functioning 24-7.
If it were installed on a dedicated circuit from any panel, it could
inadvertently be turned off. If it were installed on any general lighting
circuit, most likely you would know if it were turned off by the other
things that went off with it
> Greetings,
>
> Is there any rule which states not to run 120V wired smoke alarms from
> a subpanel? I could see someone saying that the breaker to the
> subpanel might flip leaving the smoke alarms with no AC power. Is this
> a real concern addressed within the NEC or fire codes? Or can I just
> run it off the subpanel and forget it because code doesn't address the
> issue?
>
> Thank you for your time and energy,
> William
>



Posted by Goedjn on June 16, 2005, 11:27 am


>Greetings,
>
>Is there any rule which states not to run 120V wired smoke alarms from
>a subpanel? I could see someone saying that the breaker to the
>subpanel might flip leaving the smoke alarms with no AC power. Is this
>a real concern addressed within the NEC or fire codes? Or can I just
>run it off the subpanel and forget it because code doesn't address the
>issue?

Hang another alarm on the same circut to bitch when the power
goes out.

Posted by No on June 19, 2005, 3:17 pm
Do they ever get connected between the main and the bus bar? In other words
no breaker? I'm not suggesting anyone do that. I think mine might be hooked
up that way. new house. If it is that way it was done that way for a reason
and not on accident. I learned this when I was trying to silence a nuciance
alarm (Having some new pipes soldered and kept tripping). I switched off
every breaker, one at a time, and the alarm never went off! Switched the
main and it DID go off. Strange!

> Greetings,
>
> Is there any rule which states not to run 120V wired smoke alarms from
> a subpanel? I could see someone saying that the breaker to the
> subpanel might flip leaving the smoke alarms with no AC power. Is this
> a real concern addressed within the NEC or fire codes? Or can I just
> run it off the subpanel and forget it because code doesn't address the
> issue?
>
> Thank you for your time and energy,
> William
>



Posted by SQLit on June 19, 2005, 7:50 pm

> Do they ever get connected between the main and the bus bar? In other
words
> no breaker? I'm not suggesting anyone do that. I think mine might be
hooked
> up that way. new house. If it is that way it was done that way for a
reason
> and not on accident. I learned this when I was trying to silence a
nuciance
> alarm (Having some new pipes soldered and kept tripping). I switched off
> every breaker, one at a time, and the alarm never went off! Switched the
> main and it DID go off. Strange!

The only piece of equipment I am aware of that comes off before the mains,
is a fire pump.

Please send pictures of any wiring you have in the panel that is ahead of
the main breaker.

Me thinks you just missed it and then the detector cleared itself. New
homes have a battery backup in every detector as well as the 120v power.



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