On Sun, 30 Mar 2008 13:30:35 +0100 someone who may be Andy Hall
wrote this:-

One flaw in this. In looking at the instructions for several alarm
types, if interconnect is used, they must be on the same circuit.

Generally smoke alarms are fitted in the landings at stairs.
Generally the stair lights are on one circuit.

Adding smoke alarms to every room is possible, but whether it is
worthwhile is debatable.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54