interconnected smoke and co2

[GerryB]

The conductor that interconnects is low voltage. I recall a few years back at class the instructor saying you could run that wire independent of the line wires (like if you ran 2-wire and not 3.) Anyone know if that's true? Run a # 12 or 14 thhn, outside the romex or mc?

 

[GerryB]

The conductor that interconnects is low voltage. I recall a few years back at class the instructor saying you could run that wire independent of the line wires (like if you ran 2-wire and not 3.) Anyone know if that's true? Run a # 12 or 14 thhn, outside the romex or mc?

So it is similar to 0-10 volt dimming I would think, and thhn is 600 volt insulation. Question might be how do you enter into a metal box if that is what you had.

 

[hbiss]

Would help if you told us what detectors these are with a link to the instructions.

-Hal

 

[curt swartz]

I'm guessing you are talking about the interconnect wire on standard 120 volt smoke alarms.
I have never seen any marking on these alarms to indicate the interconnect is class 2 or other low energy power supply. That being the case a chapter 3 wiring method must be used. Single conductor THHN is not an approve wiring method by itself. It would need to be installed in a raceway.

 

[GerryB]

I'm guessing you are talking about the interconnect wire on standard 120 volt smoke alarms.
I have never seen any marking on these alarms to indicate the interconnect is class 2 or other low energy power supply. That being the case a chapter 3 wiring method must be used. Single conductor THHN is not an approve wiring method by itself. It would need to be installed in a raceway.

Standard BRK or Kidde, I don't plan on doing this, it's just something I recall being said. The job is an open ceiling and easily corrected the right way.

 

[ptonsparky]

I’ve seen the signal wire ran with low voltage thermostat wire. I was not impressed.

 

[hbiss]

Standard BRK or Kidde, I don't plan on doing this, it's just something I recall being said. The job is an open ceiling and easily corrected the right way.

I thought there was something out there that I didn't know about. Never done or seen it done with other than 14/3. You must have been talking to a hack especially since he should know that you can't run THHN by itself.

-Hal

 

[jimport]

I just removed some old Square D smoke alarms from my house. Had two cables, one for power and another for the interconnect. Two different circuits powered them.

 

[kwired]

I'm guessing you are talking about the interconnect wire on standard 120 volt smoke alarms.
I have never seen any marking on these alarms to indicate the interconnect is class 2 or other low energy power supply. That being the case a chapter 3 wiring method must be used. Single conductor THHN is not an approve wiring method by itself. It would need to be installed in a raceway.

I agree just because something operates at a low voltage doesn't automatically make it a class 2 control circuit. For one thing the other conductor of the circuit is common with one the power supply circuit conductors. If it had two interconnect conductors like jimport mentioned - maybe the chance of actually being marked as class 2 is greater.

I just removed some old Square D smoke alarms from my house. Had two cables, one for power and another for the interconnect. Two different circuits powered them.