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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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    I believe the answer to this question is:

    The use of Table 54.7 for parallel cables is not applicable and the adiabatic must be used when faced with parallel cables.

    With 2 cables I think you can get away with it as you can install a cable equal to the main phase and it will be fine. When 3+ parallel cables are used it really is not the way to go.

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  • 0

    I believe the answer to this question is:

    The use of Table 54.7 for parallel cables is not applicable and the adiabatic must be used when faced with parallel cables.

    With 2 cables I think you can get away with it as you can install a cable equal to the main phase and it will be fine. When 3+ parallel cables are used it really is not the way to go.

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