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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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    AJJewsbury:
    Hopefully the fire alarm panel would recognise this as a fault and show such by a fault light and/or buzzer.

    But the panel will still need some fundamental means of recognising the fault - if both conductors are normally at the same constant voltage during normal (non-fire) conditions then it's going to be tricky to detect. 


    But not impossible. I would expect the panel to detect diverted currents that are abnormal or diverted just like an R.C.D. does. Also the panel will receive healthy confirmatory messages from the detectors that will be disturbed if the separate zone conductors are shorted surely triggering a fault alarm.


    You could always call James Bond fire alarm fault finder.

    Fire Alarm Fault Investigation at a Central London Hotel - Bing video


    Z.


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  • 0
    AJJewsbury:
    Hopefully the fire alarm panel would recognise this as a fault and show such by a fault light and/or buzzer.

    But the panel will still need some fundamental means of recognising the fault - if both conductors are normally at the same constant voltage during normal (non-fire) conditions then it's going to be tricky to detect. 


    But not impossible. I would expect the panel to detect diverted currents that are abnormal or diverted just like an R.C.D. does. Also the panel will receive healthy confirmatory messages from the detectors that will be disturbed if the separate zone conductors are shorted surely triggering a fault alarm.


    You could always call James Bond fire alarm fault finder.

    Fire Alarm Fault Investigation at a Central London Hotel - Bing video


    Z.


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