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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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    In the days of Torness and Heysham B Power station design the CEGB had prepared extensive documents about the contribution of cable to fire and specified a maximum weight of cable per metre of ladder rack (so it wouldn't fall down) and also a maximum weight of combustible material per meter of ladder rack so that it wouldn't propagate a fire.

    It seems quite unreasonable to expect any designer to be able to adequately assess the fire risk of a bunch of cables without detailed design criteria to use and any requirement to do so is just trying to pass the buck to some mug who is less qualified to do the design but is so unqualified that he doesn't realise it.

    PS Who or what is MHCLG
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    In the days of Torness and Heysham B Power station design the CEGB had prepared extensive documents about the contribution of cable to fire and specified a maximum weight of cable per metre of ladder rack (so it wouldn't fall down) and also a maximum weight of combustible material per meter of ladder rack so that it wouldn't propagate a fire.

    It seems quite unreasonable to expect any designer to be able to adequately assess the fire risk of a bunch of cables without detailed design criteria to use and any requirement to do so is just trying to pass the buck to some mug who is less qualified to do the design but is so unqualified that he doesn't realise it.

    PS Who or what is MHCLG
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