Smoke detectors not working together

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Have you actually verified the continuity of the red wire?
Might there be excessive noise voltage on the wire interfering with the signal?

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Well, it's fixed but I'd never seen this. Even though continuity existed all the way through the red wire, the detectors would not communicate with each other unless I ran a temp wire. And even then, the two units would not communicate with both the jumper and the original red wires. They only work with the jumper only. I took out all units except the first and 8 th one. I disconnected all red wires in every box, and one by one reconnected them as I added each unit. The first 8 worked fine. But when I nutted the last red run, none of the 8 units worked. A trim nail must have nicked and slightly shorted that last run of red wire, but it's blk and white were fine, Hot and neutral. Had to run a new wire to no. 9.
Thanks for your suggestions. Ready for final inspection.
 
Stevenfyeager said:
I have a megohmmeter but I am embarrassed to say I don't know how to meg it. I only used it once years ago to check a damaged heated floor. (I actually did it successfully)
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Best to learn ASAP. With the current AFCI & GCFI requirements only getting stronger, megging circuits at rough-in and before trim is becoming essential.
 
I quit supplying them after a customer said one went off at 2 am for no reason. We still have an occasional problem. But, they don't complain so much when they supply the smoke detectors.' They' meaning the home owner or the GC
 
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