David Hansen wrote:
On Thu, 30 Aug 2007 10:37:22 +0100 someone who may be The Natural
Philosopher wrote this:-

The number of storeys has nothing to do with this, no matter how
many assertions the authors make without quoting supporting
evidence.
It has a lot to do with it.

Incorrect.

The theory behind interlinked mains smoke detectors is that if an alarm
goes off on the ground floor, you will hear an alarm near where you are,
fumbling around on the 3rd floor, and get out before the fire cuts you off.

Battery-operated interlinked smoke alarms do this just as well.


well if you have gone to all the trouble of running the interlinking
wiring, seems that running them off mains would be a lot simpler.

I want aware that battery interlinked were even available.