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BS 7671 AMD 4 710.560.6.12

Daryl Coleman

I have been looking at BS 7671 AMD 4 recently and a particular standard has got my attention, it is 710.560.6.12 which reads - Where an uninterruptible power system (UPS) is used, it shall conform to BS EN 50171 and the relevant parts of the BS EN [IEC] 62040 series.

I am looking for clarification as to whether this means all UPS within a medical location or whether it is specific to safety services specifically the backing up of a medical IT system, BS EN 62040 I do not think would be an issue for any reputable UPS but BS EN 50171 is a whole different matter as this is relevant to central battery systems serving life safety services such as EM lighting, sprinkler systems etc.

At the moment the way I am reading this is all UPS systems serving medical IT systems in a medical location shall comply with BS EN 50171 because essential medical services fall into life safety systems but if this is correct that is a massive change to UPS systems in medical locations, I can also see that it could mean BS EN 50171 would only apply to a UPS if it is the sole means of backing up a safety service in the absence of a safety source but if so it is not clear at all.

 

Any help on clarifying this would be great.

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  • 0

    It seems to me that the paragraph numbering is faulty.

    710.560.6.12 and 710.560.6.13 ought logically to precede 710.560.7 and fall under the heading of Electrical sources for safety services rather than Other services.

  • 0 in reply to Chris Pearson

    Ah yes, well spotted Chris the numbering is indeed as you have stated incorrect and it would make more sense for it to be placed there before 710.560.7.

    That makes it a little clearer however in my view it is still a poorly worded entry to the standard as it does not clarify anything, for example it is very common to have a generator in a medical location and so would be classed as a safety source but only for <15s class E medium break with the delay of coming online so then a UPS with 60 minutes autonomy is used to bridge the gap until the gen set is running when this will take over and the UPS will then see "mains" again, in this case would the UPS be classed as a safety source for <0.5s class A/C no-break/short break and fall under BS EN 50171 just for the bridging of that gap in power?

    The 50171 standard for the UPS in this instance is massively over the top if this is the case, I think there is a lack of understanding of that particular British standard and the ramifications of what this means to the UPS equipment, supply, structural implications, spatial implications not to mention the cost.

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  • 0 in reply to Chris Pearson

    Ah yes, well spotted Chris the numbering is indeed as you have stated incorrect and it would make more sense for it to be placed there before 710.560.7.

    That makes it a little clearer however in my view it is still a poorly worded entry to the standard as it does not clarify anything, for example it is very common to have a generator in a medical location and so would be classed as a safety source but only for <15s class E medium break with the delay of coming online so then a UPS with 60 minutes autonomy is used to bridge the gap until the gen set is running when this will take over and the UPS will then see "mains" again, in this case would the UPS be classed as a safety source for <0.5s class A/C no-break/short break and fall under BS EN 50171 just for the bridging of that gap in power?

    The 50171 standard for the UPS in this instance is massively over the top if this is the case, I think there is a lack of understanding of that particular British standard and the ramifications of what this means to the UPS equipment, supply, structural implications, spatial implications not to mention the cost.

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