120 volt smoke detectors
- Thread starter robt6116
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peter d
Senior Member
- Location
- New England
Re: 120 volt smoke detectors
No. They wouldn't be considered a fire alarm circuit at all, but part of the overall fire safety system, which usually consists of a low-voltage fire alarm with battery backup or some type of standby power, stand alone or interconnected smoke detectors and CO detectors, exit lights, and emergency lights.
No. They wouldn't be considered a fire alarm circuit at all, but part of the overall fire safety system, which usually consists of a low-voltage fire alarm with battery backup or some type of standby power, stand alone or interconnected smoke detectors and CO detectors, exit lights, and emergency lights.
electricmanscott
Senior Member
- Location
- Boston, MA
- Occupation
- Massachusetts Master Electrician, one man show.
Re: 120 volt smoke detectors
Yes. If they are in a dwelling unit bedroom in an area under the 2005 NEC they MUST be on an afci circuit.
Yes. If they are in a dwelling unit bedroom in an area under the 2005 NEC they MUST be on an afci circuit.
- Location
- Massachusetts
Re: 120 volt smoke detectors
[ October 02, 2005, 07:45 AM: Message edited by: iwire ]
Are you sure about that?
[ October 02, 2005, 07:45 AM: Message edited by: iwire ]
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: 120 volt smoke detectors
I agree, these are not a fire alarm circuit. See the definitions in the NFPA 72, and also the ROC for 760.41 for the 2005 cycle.
I agree, these are not a fire alarm circuit. See the definitions in the NFPA 72, and also the ROC for 760.41 for the 2005 cycle.
- Location
- Massachusetts
Re: 120 volt smoke detectors
Well I learned something new, wires that interconnect smoke alarms are not fire alarm circuits.
Sounds odd to me, but that it ain't the first time the NFPA has confused me.
Well I learned something new, wires that interconnect smoke alarms are not fire alarm circuits.
Sounds odd to me, but that it ain't the first time the NFPA has confused me.
marinesgt0411
Senior Member
- Location
- Naples,FL 34110-9285
Re: 120 volt smoke detectors
IF I understand it correctly if the smoke is addressable the wires that connect the smokes to the fire alarm panel and to each other are a fire alarm circuit but the wires that supply the power are not.
it was explained to me one time and I did not understand it then either.
IF I understand it correctly if the smoke is addressable the wires that connect the smokes to the fire alarm panel and to each other are a fire alarm circuit but the wires that supply the power are not.
it was explained to me one time and I did not understand it then either.
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: 120 volt smoke detectors
Basically, it has to be suppiled by a fire alarm panel to be considered a fire alarm system.
Basically, it has to be suppiled by a fire alarm panel to be considered a fire alarm system.
Re: 120 volt smoke detectors
You can run a single red wire loose in the attic to interconnect them yes they belong on a afci just did 5 of them today 2 hallways 3 bedrooms put 1 of the hallways right next to a alrm co smoke detector to ring the fire portion of the alarm system ( The alarm works also by noise as well as heat)
South Florida Rocks
You can run a single red wire loose in the attic to interconnect them yes they belong on a afci just did 5 of them today 2 hallways 3 bedrooms put 1 of the hallways right next to a alrm co smoke detector to ring the fire portion of the alarm system ( The alarm works also by noise as well as heat)
South Florida Rocks
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: 120 volt smoke detectors
It sounds to me like you violated 300.3
It sounds to me like you violated 300.3
peter d
Senior Member
- Location
- New England
Re: 120 volt smoke detectors
That sounds like incredibly hack advice.
Re: 120 volt smoke detectors
Its a low energy, low voltage circuit..no threat of overload or shock.
Most folks here use a 14/3 NM on the units, black & white for power, red to inner-connect. As I said, on occasion, I;ve see the added single conductor, and a few times, the grounding condutor in the NM ton inner-connect(neither the units or the boxes require grounding).
Love to have input.
agree, but I do see it occassionly. Is it a violation of 300.3 ? Love to see others input.
Its a low energy, low voltage circuit..no threat of overload or shock.
Most folks here use a 14/3 NM on the units, black & white for power, red to inner-connect. As I said, on occasion, I;ve see the added single conductor, and a few times, the grounding condutor in the NM ton inner-connect(neither the units or the boxes require grounding).
Love to have input.
- Location
- Logan, Utah
Re: 120 volt smoke detectors
Bwoody420,
Residential smoke detectors are not non-power limited fire alarm systems. As Ryan points out in an earlier post, the system needs to be supplied by a fire alarm panel to fall under article 760 Fire Alarm Systems .
Electricmanscott answered the AFCI question.
If you do in fact have a non-power limited fire alarm system, then 760.21 would be applicable.
Chris
Bwoody420,
Residential smoke detectors are not non-power limited fire alarm systems. As Ryan points out in an earlier post, the system needs to be supplied by a fire alarm panel to fall under article 760 Fire Alarm Systems .
Electricmanscott answered the AFCI question.
If you do in fact have a non-power limited fire alarm system, then 760.21 would be applicable.
Chris
allenwayne
Senior Member
Re: 120 volt smoke detectors
There are smoke detedvtors 125 primary 9v that do have an interconnect for an additional fire system to be actiated ,it has been 4 years since we used one but they ar out there
There are smoke detedvtors 125 primary 9v that do have an interconnect for an additional fire system to be actiated ,it has been 4 years since we used one but they ar out there
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