"Richard Russell" wrote in message
...
In our (new build) house the three linked, mains (and battery)
powered, smoke detectors were supposed to be fed from a separate
breaker in the consumer unit. Except that they weren't - at some
point during the build the connection was broken and the only
practical way to restore operation was to wire them into the lighting
circuit instead. The electricians assure me it's perfectly OK to do
that, but what are the pros and cons of having a separate breaker for
the smoke detectors?

I agree with what's been said about the advantages of connecting to a
lighting circuit but read the regs and decide.

http://www.planningportal.gov.uk/upl..._ADB1_2006.pdf (para 1.19)

I note that if using a lighting circuit the alarms should be capable of
being seperately isolated from the lighting circuit. Electrically I agree
with that but can't help thinking it largely removes the advantage.

So for once you electricians are right, as long as they incorporate seperate
isolation.

Jim A