Originally Posted By: K447
I installed AC hardwired smoke detectors during the last heavy renovation. They are all wired together as part of the standard 3-conductor AC wiring scheme outlined in the installation instructions. When any one of them triggers, they all sound. I think this has become almost standard now.


Yeah, and when one of them is regularly falsing at 3am, only one or two nights a year, that design means you can't tell which one falsed and needs replacing. :-)

I disconnected the inteconnection wires on them all and sure enough, one of them falsed, just one, and I finally replaced it. :-)
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Tony Fabris