Smoke alarm recommendations

[Roger Hayter]

That's a shame, seeing it's got to be surface wiring.[1] Does the interlinking have to be physically separate from the electricity supply?

[1] It would be very inconvient to do otherwise.

[ARW]

I thought you said you wanted battery detectors.

So where has the electricity supply come from?

[Roger Hayter]

I prefer battery ones but three of them have to be wired together because they are behind a thick stone wall, and separated from each other by a second thich stone wall. DECT and Wifi don't work through these walls so I doubt if the wireless for the alarms will either. Mains can come from a new fused spur if it absolutely has to.

[ARW]

That might have to be the answer with a RF heat.

Note that the orientation of the bases is helpful to their signal.

[Roger Hayter]

Thanks. It sounds as though that is the way it's got to be done! Do you need to run a signal cable separate from the mains or can you use multicore? I've got some 5 X 0.75mm somewhere.