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Ca rating factors for cables installed within and environment with ambient temperature of 20C

rotten

Hi all, I'm doing a design of a circuit where the specified ambient temperature of the building is 20C. However in table 4B1 of BS7671 it only shows rating figures  down to as low as 25C. Is this the figure to be used? (25C) or am I missing something regarding this? TIA

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    I suspect that table is simply based on normal UK weather conditions and the traditional lack of air conditioning - almost anywhere in the UK will experience air temperatures up to 25ºC at some point in the year - often rather higher (hence the usual default of 30ºC). Nothing stopping you extrapolating if you need to though.

       - Andy.

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    I suspect that table is simply based on normal UK weather conditions and the traditional lack of air conditioning - almost anywhere in the UK will experience air temperatures up to 25ºC at some point in the year - often rather higher (hence the usual default of 30ºC). Nothing stopping you extrapolating if you need to though.

       - Andy.

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