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Cabling to AOV systems (Life safety)

Peter Read

We have a natural smoke vent system on a project where the main supply cable to the SVCP has been taken from a local DB and wired in SWA. These systems have a 72 hour back up for the life safety element and all power & control cabling from the inverter is wired in FP200. However, the AOV contractor has just informed us that the main supply should also be wired in FP and afford the appropriate protection. My question is should the main supply be installed in FP from the main panel board or can the protection be from just the local DB, bearing in mind that should the system 'fall over' the battery system will still give 72 hours of protection. Any insight would be appreciated.

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    In this case there is no much point in providing fire rated cable just between DB and SVCP since you have dedicated fire protected power backup system for SVCP. If the project has a parallel emergency power distribution system backed up with a secondary power source, this SVCP shall be connected in that and all cables including cable between DB and SVCP shall be fire rated.

  • 0 in reply to Yasir
    Yasir said:
    In this case there is no much point in providing fire rated cable just between DB and SVCP since you have dedicated fire protected power backup system for SVCP.

    Whilst that is true, it doesn't answer the question as to whether the DB is the correct place to supply the 'primary power', given the requirements of BS 9999 that the 'primary power' ought to be supplied by fire rated circuits that are not unduly affected by faults on other circuits (as per my earlier post). Only a competently compiled fire safety risk assessment can answer that.

  • 0 in reply to gkenyon

    My apologies for missing the main point in the reply. My point was that they can't comply with BS 9999 just by providing fire rated cable from the local DB to SVCP. As you've mentioned, Only a competent site assessment can give a solution by assessing fire risks and comparing the cost between changing the existing cables and introducing a new fire rated supply from main panel till SVCP.

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  • 0 in reply to gkenyon

    My apologies for missing the main point in the reply. My point was that they can't comply with BS 9999 just by providing fire rated cable from the local DB to SVCP. As you've mentioned, Only a competent site assessment can give a solution by assessing fire risks and comparing the cost between changing the existing cables and introducing a new fire rated supply from main panel till SVCP.

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