The drawing represents what I was on about although the charge point and earth rod were on the same side as the buried pipe with the person on the far side of the car where the charge point is shown. How can I confirm that such a situation does not exist or is unlikely to exist when using TT “island” on a TNCS site?
How can I confirm that such a situation does not exist or is unlikely to exist when using TT “island” on a TNCS site?
you don't unfortunately
But if you were to decide to earth the car to the same earth as the cable beneath, then while it reduces the risk to the person standing over the cable during a PEN fault and opening the car door, sadly anyone approaching the same car from any other direction is more likely to get a shock from the car instead... Of course a faulty PEN on a sub-main that is not the one feeding the car is not mitigated either...
As I noted in the post above the best is if the defective cable is as far away from the feet as possible, and given we cannot really move it, adding a bit of a meander to the current path with some paving slabs or a layer of tarmac is quite worthwhile.
(even if it is not in the standards ;-~)
Mike.
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