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Cables and reaction to fire

Why do you suppose that the MHCLG did not feel it necessary to mandate levels of performance for cables with respect to their reaction to fire as was their prerogative under CPR?

Clearly the current non-prescriptive approach is either working or there is no significant evidence that cables and wiring systems have unduly contributed to the propagation of a fire or resulted in emissions that made a situation untenable when it would not have otherwise been. 

Further, what does it actually mean in the note in 422.2.1 that cables need to satisfy the requirements of the CPR in terms of their reaction to fire? I can find nothing specific in the CPR other than the need for CE marking and the requirements placed on the manufacturers for technical information.
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  • Chris Pearson:

    ....a fire extinguisher is no use at all ...




    I disagree with this. If the only way out is a window I would far rather have a fire extinguisher to put through it than try to smash it with my hands.....

    I did my fire training with the merchant navy rather than the RN but it was certainly valuable experience. If it was a small fire (waste paper basket as suggested, perhaps) I would feel quite confident tackling it with a fire extinguisher, though if it actually was a waste paper basket I would probably just upend it as being a more reliable means of extinguishing. The real purpose of fire extinguishers in buildings is not to enable the occupants to put the fire out but rather if the occupants find their escape blocked by fire to give them a chance to get through. The fire brigade are the professionals so let them deal with the fire (and don't make them have to rescue you first).

    False alarms are a definite problem but they are nowhere near as prevalent as they used to be. The addressable fire detection systems which were developed in the 1980's and subsequently did a lot to minimise the problems. I mentioned having been in hotels where the fire alarm had gone off - these were not fires but were the alarms reacting correctly (twice through someone in the restaurant at breakfast burning toast activating an alarm and at least once due to a resident leaving the bathroom door open while showering). The fact that this was 100% correct functioning of the detectors is a pretty high success rate.

    Alasdair

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  • Chris Pearson:

    ....a fire extinguisher is no use at all ...




    I disagree with this. If the only way out is a window I would far rather have a fire extinguisher to put through it than try to smash it with my hands.....

    I did my fire training with the merchant navy rather than the RN but it was certainly valuable experience. If it was a small fire (waste paper basket as suggested, perhaps) I would feel quite confident tackling it with a fire extinguisher, though if it actually was a waste paper basket I would probably just upend it as being a more reliable means of extinguishing. The real purpose of fire extinguishers in buildings is not to enable the occupants to put the fire out but rather if the occupants find their escape blocked by fire to give them a chance to get through. The fire brigade are the professionals so let them deal with the fire (and don't make them have to rescue you first).

    False alarms are a definite problem but they are nowhere near as prevalent as they used to be. The addressable fire detection systems which were developed in the 1980's and subsequently did a lot to minimise the problems. I mentioned having been in hotels where the fire alarm had gone off - these were not fires but were the alarms reacting correctly (twice through someone in the restaurant at breakfast burning toast activating an alarm and at least once due to a resident leaving the bathroom door open while showering). The fact that this was 100% correct functioning of the detectors is a pretty high success rate.

    Alasdair

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