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12/2 vs 12/3

4K views 6 replies 6 participants last post by  Oso954 
#1 ·
Silly question. Found that my electric fire alarms are wired with 12/3 with a ground. Not a 12/3 in my breaker box, so I'm assuming it is branched off of something else. The alarms are no good (won't go into detail) but will replace with plain battery operated ones. Can I just cap of the wires and put a cover plate on without it affecting whatever it is branched off of?
 
#5 ·
You will need the third wire in the cable to properly connect the smoke detectors to each other. You only need 2 wires to provide the power.
 
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