Wiring for wireless smoke alarms to ceiling pendants.

[tryitandsee]

Researching wireless smoke alarm systems.
When taking supply from ceiling pendant for each wireless detector, is the correct way to put in a fused spur (unswitched so tenant can't turn it off) then supply detector. Or should you just take supply straight from pendant to detector. You then rely on the distribution board to isolate?

 

[ekmdgrf]

Unfortunately my BS-5839 is at home but I believe that fire detection should go on its own final circuit.

 

[Risteard]

Presuming that we are talking about a domestic smoke alarm circuit (BS 5839-6) then it may actually be preferable to supply it from a regularly used lighting circuit (so that it will not be left de-energised).

No need for a fused connection unit though. Generally speaking removing the head from the base with for example an EI/AICO alarm will be sufficient for isolation, otherwise I suppose you could fit a key switch or similar.