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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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  • 0
    What you shouldn't do is mix non BS 5839 systems with other systems eg, it's not appropriate to run fire and emergency lighting on the same containment (as both relevant standards advise against it for the reasons given in my first comment




    Not questioning your wisdom, but how far does this go?

    I regularly see recent commercial refits with fire cabling cable tied to one side of a basket, and final circuits tied to the other half , with no physical separation barriers. There are also the ones with the clip in metal dividing inserts to divide the basket, and, then those with a separate basket for fire cabling, but using the same hangers/brackets to hold them.

    What is 'the same containment'? 

    By that, I would expect to have a separate basket for the fire cabling, but many installs think they can use the same basket, so long as the cabling is around 30-50mm apart from the final circuits.


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  • 0
    What you shouldn't do is mix non BS 5839 systems with other systems eg, it's not appropriate to run fire and emergency lighting on the same containment (as both relevant standards advise against it for the reasons given in my first comment




    Not questioning your wisdom, but how far does this go?

    I regularly see recent commercial refits with fire cabling cable tied to one side of a basket, and final circuits tied to the other half , with no physical separation barriers. There are also the ones with the clip in metal dividing inserts to divide the basket, and, then those with a separate basket for fire cabling, but using the same hangers/brackets to hold them.

    What is 'the same containment'? 

    By that, I would expect to have a separate basket for the fire cabling, but many installs think they can use the same basket, so long as the cabling is around 30-50mm apart from the final circuits.


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