Smoke alarms wiring

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Looking for some advice on this. Aico instructions recommend mains supply from a "regularly used local lighting circuit". However, BS7671 requires all circuits of safety services to be independent of other circuits. (560.7.1)

Any thoughts?
 
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Technically they (alarm and lights) will be on the same circuit so as long as they are independent of all other circuits all is well.
 
The recommendation from BS5839-6 for grade D is
The normal supply for smoke alarms and any heat alarms in a Grade D system should be derived from the public electricity supply to the dwelling. The mains supply to the smoke alarms and heat alarms should take the form of either:
i) an independent circuit at the dwelling's main distribution board, in which case no other electrical equipment should be connected to this circuit (other than a dedicated monitoring device installed to indicate failure of the mains supply to the smoke alarms and any heat alarms); or
ii) a separately electrically protected, regularly used local lighting circuit.


A grade D system is
A system of one or more mains-powered smoke alarms, each with an integral standby supply. (The system may, in addition, incorporate one or more mains-powered heat alarms, each with an integral standby supply.)
 
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Thanks all, that clarifies it. Just for info I notice the 2013 edition of 5839-6 recommends the lighting circuit be labelled so that people know smoke alarms are also connected to the circuit.
 
Thanks all, that clarifies it. Just for info I notice the 2013 edition of 5839-6 recommends the lighting circuit be labelled so that people know smoke alarms are also connected to the circuit.

Yes, so label smokes on the circuit.
I generally have three notifications of smoke alarms on circuits at the board.
 

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