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Do you install fire alarm systems?

Chris Pearson
Bit of thread drift going on elsewhere, so I have started a new one.


"Do you install fire alarm systems?" - a question which is asked on insurance renewal, but what does it mean?


IMHO, there is a world of difference between providing a mains supply with third core for linking for a couple of smoke detectors and a heat detector in the kitchen on the one hand (i.e. the minimum grade D2 LD3); and a full on panel with separate detectors and sounder etc. (grade A LD2) in a large house. I consider myself perfectly capable of providing the former, but have never attempted the latter.


So where does the threshold lie? I'd be interested in views on certification too please.
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  • 0
    1. Broken positive conductor.


    2. Broken negative conductor.


    3. Short between the two above.


    Earth NOT needed in all three cases.

    What about a nail through two cables running together? Shorting one say +ve conductor to the same of another circuit will likely not trip/blow anything but will likely result in mis-operation. An earthed screen on the cables allows that to be detected (OK not necessarily earthed, but at some voltage distinct from that of the cores - but earth is probably handy for that).

       - Andy.
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  • 0
    1. Broken positive conductor.


    2. Broken negative conductor.


    3. Short between the two above.


    Earth NOT needed in all three cases.

    What about a nail through two cables running together? Shorting one say +ve conductor to the same of another circuit will likely not trip/blow anything but will likely result in mis-operation. An earthed screen on the cables allows that to be detected (OK not necessarily earthed, but at some voltage distinct from that of the cores - but earth is probably handy for that).

       - Andy.
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