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PME vs TN-C-S

AncientMariner
Are PME and TN-C-S supplies exactly the same?  Or does PME also have requirements regarding the number and relative location of suppliers earthing rods?

I am thinking here where the DNO replaces a length of failed 4-core (3-phase + Neutral) PILC cable with Wavecon or similar cable which has a combined Neutral and Earth conductor.  The average consumer would not know that their electricity supply's method of earthing had been changed.

Clive.
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    Chris Pearson:

    Can it ever be PME if there is only one earth rod?


    Yes - at the very least PNB. See G12/4, Clause 4.11. The reason PME conditions apply if there is only one electrode is that there can be fortuitous electrodes such as extraneous-conductive-parts. Since up to 4 customers can be supplied with the arrangement, diverted neutral currents can flow through these ...


     


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  • 0
    Chris Pearson:

    Can it ever be PME if there is only one earth rod?


    Yes - at the very least PNB. See G12/4, Clause 4.11. The reason PME conditions apply if there is only one electrode is that there can be fortuitous electrodes such as extraneous-conductive-parts. Since up to 4 customers can be supplied with the arrangement, diverted neutral currents can flow through these ...


     


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