mains smoke Alarm Ask questions and find answers to many subjects relating to electrics and electrical work

[Basil20]

I wonder if anyone can help me
I want to fit a mains smoke alarm with battery back up in my house
and wonder if it can be feed from the lighting circuit, and if so can i take another smoke alarm looped from the first one.
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[sparx]

Yes & yes,
find perm. live & neutral at nearest light, use twin/earth to first alarm, loop between alarms using 3core /earth.
this supplies power to second alarm & third wire is trigger so whichever alarm goes off they both(all) sound, together.
regards Sparx

[Basil20]

Thanks for your help Sparx

[Jeffmo]

All lights on one circuit , all sockets on one radial circuit is this okay or do i have to split them both to upstairs and downstairs?