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BICC or BS7671 comply for design

Anthony Sullivan
Hello IET guys 


I have a problem where a cable installed on site doesn't comply to Bs7671 current  carrying capacity for underground cable reference method D 


the engineer who design the cable used amtech and data from bicc with reference method 110. 


Dose bicc comply? As its old data for cables install in any country from what I can see. I would have thought bs7671 design must be used? 

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  • 0
    Wise to be wary of software, it is a good helper and a bad master. Be aware though that the tables at the back of the regs are not the last word on cable installation methods, rather a set of safe figures for designing from with minimal research. There are a great many assumptions that are hidden in the assumptions that certain routing methods are the same (cables don't really cool the same horizontally as they do vertically, assuming you are not in a space station, and convection is the main cooling mechanism, not all plaster walls are equal,  etc.) The figures cannot sensibly cover all cases, and sometimes there will be some installation condition where there is nothing for it but to measure temperatures in situ, or more usefully for inspections, to fit temperature disclosing stickers, and see the 'high tide' markers between one inspection and the next.
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  • 0
    Wise to be wary of software, it is a good helper and a bad master. Be aware though that the tables at the back of the regs are not the last word on cable installation methods, rather a set of safe figures for designing from with minimal research. There are a great many assumptions that are hidden in the assumptions that certain routing methods are the same (cables don't really cool the same horizontally as they do vertically, assuming you are not in a space station, and convection is the main cooling mechanism, not all plaster walls are equal,  etc.) The figures cannot sensibly cover all cases, and sometimes there will be some installation condition where there is nothing for it but to measure temperatures in situ, or more usefully for inspections, to fit temperature disclosing stickers, and see the 'high tide' markers between one inspection and the next.
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