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Application of BS7671 Table 54.7

McN41R

Can anyone offer experience on the application of Table 54.7 for Main Earth size on non PME supplies for supplies that have parallel incoming cables.

For example, 2 x 185mm2 PCV/SWA installed in separate ducts.

Thanks

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  • 0

    Have a look at Table 54.7 and see what it says for live conductors of 2 x 185? You may then wish to calculate the size of your earthing conductor using the adiabatic equation.

  • 0 in reply to John Peckham

    I am looking at table 54.7 it does not appear to make any recommendations with respect to the application of parallel incoming cables, this is why I am asking experience in the application of this table with respect to parallel incoming cables.

    I appreciate at the design stage these may be sized by calculation by the designer.

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  • 0 in reply to John Peckham

    I am looking at table 54.7 it does not appear to make any recommendations with respect to the application of parallel incoming cables, this is why I am asking experience in the application of this table with respect to parallel incoming cables.

    I appreciate at the design stage these may be sized by calculation by the designer.

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