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Electrical Wire and Cable

Wiring and Repairing Smoke Detectors


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Summary: How to Wire and Repair Smoke Detectors - Installation Guide with Photos that Explain Smoke Detector Wiring and Repairs.

Install and Repair Smoke Detectors

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Components for Wiring and Repairing Smoke Detectors

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Questions about Smoke Detectors


Recent Questions and Comments


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Questions about Wiring Smoke Detectors


Question from Mike, an Electrician from Patchogue, New York:

Can the carbon monoxide alarm be connected to the smoke detectors in series and be the last on the line? I haven’t been on the job for a few years and I just want to make sure that is how it is done again. I know the smoke detectors are in series, but I forget if the carbon monoxide can be connected to it as well.

Dave’s Answer:

Many local areas require permanently installed carbon monoxide detectors with battery backup which are used to detect odorless gas which could be fatal. Check with your local building jurisdiction for the specific requirements, and if combining the circuit wiring of carbon monoxide detectors and smoke detectors is permitted.
Citation Reference: NEC NFPA 72 Article Section 29.5


Question from Mike, a Homeowner from Twin Falls, Idaho:

I want to install smoke alarms. Can I use 14/3 wire or do I have to use 12/3?

Dave’s Answer:

Smoke alarms may be wired from a circuit using 14/3 wire.




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Methods for Home Electrical Wiring
Wiring Diagrams for Smoke Detectors
Interconnected Smoke Detector Wiring
Wiring Methods for AFCI Circuits
Electrical Codes for Smoke Detectors
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Questions and Answers about Smoke Detectors