On Aug 11, 7:54 am, "RBM" rbm2(remove wrote:
That depend upon your local codes. Pull one unit down and see if all three
wires connected to it are attached to wires in the outlet box, if so, they
are interconnected

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Recently moved into a 2 year old townhouse and the smoke detectors are
hardwired all on one circuit.
If one goes off, do they all go off?- Hide quoted text -

- Show quoted text -

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.