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BS 8519

Frankie 223
Hello,


I understand that the standard identifies the need for a dedicated containment for the fire rated life safety circuits. I assume this is so the normal circuits (non fire rated) will not compromise the integrity of the life safety circuits in case of fire (eg normal circuits will be on fire before the fire rated circuits which will be next to them if they were installed on the same containment).


But wouldn’t the same happen with the cpcs of the life safety circuits that are not fire rated?


Furthermore, is it ok to install on the same containment a circuit with 30 mins fire survival time (eg fire alarms) along with a circuit of 1 or 2h fire survival time (eg disabled refuge)?


I was under the impression that the fire survival time of a circuit is based on its wickest component but this does not always seem to be the case since the cpc are installed in the same containment.


It would be appreciated if you could share your thoughts.
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    My understanding is that life safety supplies should be on a separate cable support system which ideally would be installed above all other services so a premature collapse of the later would not compromise/destroy the life safety circuits.


    But if the spirit of the reg is that sundries of normal circuits might affect the life safety circuits then maybe a neat installation with dividers could be enough?
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    My understanding is that life safety supplies should be on a separate cable support system which ideally would be installed above all other services so a premature collapse of the later would not compromise/destroy the life safety circuits.


    But if the spirit of the reg is that sundries of normal circuits might affect the life safety circuits then maybe a neat installation with dividers could be enough?
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