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Life safety system cabling inside smoke extract shaft

Frankie 223
Hi all,


On a seven floor building the design suggests to install cable trays containing secondary power supplies to life safety systems inside the smoke extract shaft (life safety panel is on the basement level). I understand that inside the shaft only equipment relevant to its purpose should be installed but not confident if cables should be rising in there. I personally feel uncomfortable for these supplies to be installed in a shaft that is dedicated to extract smoke as if there is any fire incident that is a place that temperature will rise for sure. It should be noted that the cables are FP600S.


So basically there are two questions:

a/ Is it ok to install the secondary supply for the smoke extract fan along the shaft?

b/ same but for secondary supplies to other life safety equipment.


It would be appreciated if you could share your thoughts.
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    Inevitably such work will be subject to a building control application which normally requires the applicant to specify how fire safety is to be met. That is usually via ADB, BS9999 2017 or via a fire engineered approach. We commonly use 9999 where possible at it provides for a slightly more flexible design. That document makes it clear that smoke vents for firefighting shafts should not have any services within other than those that are directly related to the operation of the smoke shaft. Even if the smoke shaft is for other than firefighting purposes, such as part of a smoke control system for protected lobbies and corridors, the same restriction applies.

    Common sense would tell you that because these smoke vent systems are often subject to careful modelling using computational fluid dynamics methods to confirm appropriate operation, sticking services in the vent shafts ain’t clever!
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  • 0
    Inevitably such work will be subject to a building control application which normally requires the applicant to specify how fire safety is to be met. That is usually via ADB, BS9999 2017 or via a fire engineered approach. We commonly use 9999 where possible at it provides for a slightly more flexible design. That document makes it clear that smoke vents for firefighting shafts should not have any services within other than those that are directly related to the operation of the smoke shaft. Even if the smoke shaft is for other than firefighting purposes, such as part of a smoke control system for protected lobbies and corridors, the same restriction applies.

    Common sense would tell you that because these smoke vent systems are often subject to careful modelling using computational fluid dynamics methods to confirm appropriate operation, sticking services in the vent shafts ain’t clever!
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