Application of BS7671 Table 54.7

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.


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  • 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.