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Cables and reaction to fire

lyledunn
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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    And the most common case, for false alarms, you may as well remain in place.


    You have to accept for any sensor, be it detecting fires, navigating autonomous vehicles round a school entrance at leaving time, or for medical diagnosis of tumors, that some real dangerous events will be missed, and some false alarms will occur - but having multiple sensor technologies voting, and careful placement should make this risk balance acceptable - or at least better than a skilled  person. If not, it is not really fit for purpose.

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    And the most common case, for false alarms, you may as well remain in place.


    You have to accept for any sensor, be it detecting fires, navigating autonomous vehicles round a school entrance at leaving time, or for medical diagnosis of tumors, that some real dangerous events will be missed, and some false alarms will occur - but having multiple sensor technologies voting, and careful placement should make this risk balance acceptable - or at least better than a skilled  person. If not, it is not really fit for purpose.

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