Probably: That now seems to be standard here if there is more than one
And some 30 years ago was the rule in all townhouses owned and
operated by our Public Housing Commission.
Mandatory AC operation instead of the usual 9 volt battery operation
was used because children might steal the batteries to operate the
then popular transistor radios!
In a friends extensively and recently renovated (to code) house the
new smoke alarms on each of 3 floors are linked. They appear to be AC
operated with apparently a battery backup?
On Aug 11, 7:39 am, firstname.lastname@example.org wrote:
Funny, that's not how my hard wired ones work. You can test them
individually, but setting one off, with smoke will cause them all to
go off. Of course, when one fails and sets them all off, it always
happens around 4 AM... :-)
Most likely they are interconnected. All the ones where they were on
multiple levels and wired on one cricuit that I've seen in the last
20+ years have been. I would think this would be required by code in
any new townhouse type dwelling. The obvious idea is that if the one
in the basement goes off, you want the one in the 3rd floor bedroom to
go off to make sure you wake up.
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