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sjm
No extra isolation needed. But don't just take a chance on me - I called AICO about this before. They state that all their alarms CAN be isolated without turning off the lighting circuit they are (or could) be connected to as the act of sliding them off the bases is isolation enough. They were born that way - They state they designed them to isolate this way to satisfy building regs.
Regards, Dave
I have also questioned AICO and got the same response!
Preferred method is to connect smokes into "local regularly used lighting circuit". Interconnect using hard wired or wireless. If wireless each smoke can be connected to different lighting circuits, if hard wired then all smokes must be from the same circuit.
MWC and BS5389 smoke/fire detection certificate.