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Mains Smoke Alarms

RustyH

Morning All,

What is the general consensus for installing Interlinked Smoke Alarms. Am I right in thinking the Hardwired Interlinked ones need their own dedicated circuit so there is a signal cable between each zone and the wireless ones can simply be tapped into the lighting circuits?

Is it therefore preference to fit wireless linked mains powered systems?

When Part B gets updated, Would we expect them to force hardwired signals, and therefore to future proof better to put in a hardwired system from the get go on a full rewire?

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  • 0

    The hardwired ones can still share a circuit, although the tap from the existing circuit can obviously only be at a single point, then dedicated cabling to the other alarms.

  • 0 in reply to wallywombat

    Right, so if you tap in say down stairs, do you have to run dedicated cabling to the upstairs from that one as well?

  • 0 in reply to RustyH

    Yes you still need dedicated cabling. Well I suppose in theory to could tap power in multiple places (from the same lighting circuit), but you'd still need to run a (sheathed) single between floors to provide the signalling, so you might as well run power too, and avoid confusing future electricians.

  • 0 in reply to wallywombat

    Ok, that make sense

    Do you typically use a 3 core T&E, or standard 2 core and use the earth for signal?
    Or a completely different core colour set all together?

  • 0 in reply to RustyH

    3 core + earth MUST BE USED; just download an installer's manual from any alarm manufacturer's website.

  • 0 in reply to Gel Jones

    Much appreciated, thanks

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