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Dating existing electrical installations by type of cable

Dave Thomas
Modern pvc T&E cables 4mm and below are a  usually single solid conductor, but going back a few years ring mains were regularly installed with either 2.5mm ( or possibly older imperial  cables?) that were multi stranded conductors. Does anyone know, was there a date, or edition of the good book, when this changed, and at what point was metric mmsq specified instead of the older wire gauge?

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    Yes, the stranded (and tinned copper) smaller sizes of T&E will be imperial (although I think current 4mm² is stranded for the live conductors)


    Date wise, if it's of any help, page 8 of the current BS 7671 says that a Supplement on the use of metric terms was issued in 1969 and the regs themselves were reprinted in metric units in 1970.


      - Andy.
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    Yes, the stranded (and tinned copper) smaller sizes of T&E will be imperial (although I think current 4mm² is stranded for the live conductors)


    Date wise, if it's of any help, page 8 of the current BS 7671 says that a Supplement on the use of metric terms was issued in 1969 and the regs themselves were reprinted in metric units in 1970.


      - Andy.
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