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BS 7671 interpretation of clause 560.7.7

MS01
Within BS7671 there is the following clause:-

560.7.7 Safety circuit cables, other than metallic screened, fire-resistant cables, shall be adequately and reliably separated by distance or by barriers from other circuit cables, including other safety circuit cables.

Now I read this in two ways, the first is this is specifically talking about fire rated cables only… or

This is insinuating that unless I use a metallic screened fire-resistant cable I must provide separation by distance or by barriers including from other safety circuit cables. Does this mean a common dedicated medical IT final circuit trunking is not acceptable as each IT circuit in its own right is a safety circuit, therefore if I was to move away from fire rated cable I would need to ensure each IT circuit is installed in its own individual piece of containment (conduit) to give the correct level of separation or would a common galvanised trunking dedicated to the IT cabling be sufficient.

I appreciate no one will give me an answer to the question above, but can people let me know how they interpret this clause to see if I’m on the right lines.  

Can I ask how do you interpret this clause?

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  • 0
    But playing devils advocate as you've said When you read the BS7671 part 2 definitions  for a safety circuit it states:-



    Safety service.


    An electrical system for electrical equipment provided to protect or warn persons in the event of a hazard, or essential to their evacuation from a location.


    But could you argue this definition still applies as it provides protection by continuing supply medical electrical equipment if there is a failure in supply or an adverse condition.

    I think in reality this this needs addressing in the next version of the HTM otherwise Contractors will continue to be scared of non-complying to the regulations unless they use fire rated cabling.


    so the question is if the UPS/IPS are located in adjacent fire compartment (deemed low risk)  to the area they serve  would you wire the final IT circuits in FP100 or LSF singles ???
     



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  • 0
    But playing devils advocate as you've said When you read the BS7671 part 2 definitions  for a safety circuit it states:-



    Safety service.


    An electrical system for electrical equipment provided to protect or warn persons in the event of a hazard, or essential to their evacuation from a location.


    But could you argue this definition still applies as it provides protection by continuing supply medical electrical equipment if there is a failure in supply or an adverse condition.

    I think in reality this this needs addressing in the next version of the HTM otherwise Contractors will continue to be scared of non-complying to the regulations unless they use fire rated cabling.


    so the question is if the UPS/IPS are located in adjacent fire compartment (deemed low risk)  to the area they serve  would you wire the final IT circuits in FP100 or LSF singles ???
     



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