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Use of PME not allowed, special locations

Alan M Walton

   Some Special locations won't allow PME to be used.which I understand.  However with  EV charging points. We can overcome the PEN fault by automatic disconnection of supply is described in 722.411.4.1(iii).

    So why can't we use the same logic in other locations. Where lost of supply doesn't  in danager life or property.

   

Parents

  • Most of these the potential difference measured from an artificial/ calculated base voltage.why can't we make them measure the difference between the actual supply earth potential and the true earth potential.

    You can - that's option (iii) of reg 722.411.4.1 (rather than option (iv)). The issue is that it means banging in a local rod - in ground that's likely to have buried services already in it (electric, water, gas, drainage, possibly landlines) - hand digging and backfilling isn't ideal either from the point of view of good contact with solid earth nor installation costs.

       - Andy.

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  • Most of these the potential difference measured from an artificial/ calculated base voltage.why can't we make them measure the difference between the actual supply earth potential and the true earth potential.

    You can - that's option (iii) of reg 722.411.4.1 (rather than option (iv)). The issue is that it means banging in a local rod - in ground that's likely to have buried services already in it (electric, water, gas, drainage, possibly landlines) - hand digging and backfilling isn't ideal either from the point of view of good contact with solid earth nor installation costs.

       - Andy.

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