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Formula for values in Table 52.2 - cables passing through thermal insulation?

Ben Gregory

Does anyone know the formula used to get the values given in table 52.2 BS7671, (now moved to Appendix 4 item 2.6) please? 

Not how to apply the values, this is obvious.

Many thanks

Ben

Parents
  • +1

    This was dealt with by an IEE Wiring Regulations committee called WR2.  I was on WR2 as the NICEIC representative in the early 1990's.

    This table was reviewed by WR2 but , as I recall, the data came to WR2 via ERA Technology Ltd.  I pretty sure the data was mainly produced from experiments and I don't recall any formulas.

    Regards

    Geoff Blackwell 

Reply
  • +1

    This was dealt with by an IEE Wiring Regulations committee called WR2.  I was on WR2 as the NICEIC representative in the early 1990's.

    This table was reviewed by WR2 but , as I recall, the data came to WR2 via ERA Technology Ltd.  I pretty sure the data was mainly produced from experiments and I don't recall any formulas.

    Regards

    Geoff Blackwell 

Children

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