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Wire size and Smokes #13308 08/30/02 01:05 AM
Joined: Aug 2002
Posts: 25
J
Joule-E Offline OP
Member
I run #12 NM using 3 wire to run 120V smokes and share with a lighting circuit. The smokes have #18 wires to tie into. I am wondering about this reduced wire size being an issue. I know the things dont use much juice, but it seems odd to tie in #18 to a 15 or 20 Amp circuit. Is this a bad design or do the smokes' wires in the J-box count as part of the internal workings of the fixture?

Is there an article on this issue I can read up on?

Thanks in advance.

[This message has been edited by Joule-E (edited 08-30-2002).]

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Re: Wire size and Smokes #13309 08/30/02 10:20 AM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
Treat it like a light fixture. Don't worry about protecting the small wire from overloads.

OTOH, the 18AWG conductors are considered adequately protected for short circuits by a 20-amp overcurrent device. It’s sort of a juggling act, I agree.

I don’t know if the detector and 115V pigtail can fail in any mode to start a fire. {?}


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