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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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    Chris Pearson:



    To be honest I don't know what the routine is in classified areas - you wouldn't normally even leave your desk if highly sensitive materials were in use. 



    Classified areas will generally have access control, normally through a card swipe or keypad to open the door (to get in at least). All doors are automatically unlocked when the fire alarm sounds so that people can escape rapidly (which means if you want to get in, just set off the fire alarm or wait for the weekly test - I know it works as I have tried it, but only with rooms I had access to anyway and only with the weekly test). This does mean that when the fire brigade turn up, assuming the alarm has been silenced as everyone is out, somebody else will need to open the doors to let them in to put the fire out (or they could use their normal method of breaking down all the doors and then apologising as they leave...).

    The only instructions might be to lock the highly sensitive material in a drawer before leaving the room. As only documents in use will be in the open, it should only take a second or two, and with the way things are going the majority of documents nowadays will be on secure computers rather than on paper (secure as in not connected to the internet and encrypted), so locking the computer will be sufficient and only takes a second.

    Having said all this, I realise that we are suffering from a bit of topic creep here. I am not sure what this has to do with cable fire performance. Any comments to bring it back will no doubt be welcomed by Lisa.

    Alasdair

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    Chris Pearson:



    To be honest I don't know what the routine is in classified areas - you wouldn't normally even leave your desk if highly sensitive materials were in use. 



    Classified areas will generally have access control, normally through a card swipe or keypad to open the door (to get in at least). All doors are automatically unlocked when the fire alarm sounds so that people can escape rapidly (which means if you want to get in, just set off the fire alarm or wait for the weekly test - I know it works as I have tried it, but only with rooms I had access to anyway and only with the weekly test). This does mean that when the fire brigade turn up, assuming the alarm has been silenced as everyone is out, somebody else will need to open the doors to let them in to put the fire out (or they could use their normal method of breaking down all the doors and then apologising as they leave...).

    The only instructions might be to lock the highly sensitive material in a drawer before leaving the room. As only documents in use will be in the open, it should only take a second or two, and with the way things are going the majority of documents nowadays will be on secure computers rather than on paper (secure as in not connected to the internet and encrypted), so locking the computer will be sufficient and only takes a second.

    Having said all this, I realise that we are suffering from a bit of topic creep here. I am not sure what this has to do with cable fire performance. Any comments to bring it back will no doubt be welcomed by Lisa.

    Alasdair

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