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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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    lyledunn:

    As I understand it, PME describes a specific method of providing a consumers earth. TNCS is an earthing arrangement that includes the PME terminal but extends in to the installation to additionally describe the relationship between neutral and earth therein.


    There can be TN-C-S without PME arrangements or conditions, but not, at least in the UK, where the supply is provided to the consumer at LV, and the provisions of the ESQCR apply.


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    lyledunn:

    As I understand it, PME describes a specific method of providing a consumers earth. TNCS is an earthing arrangement that includes the PME terminal but extends in to the installation to additionally describe the relationship between neutral and earth therein.


    There can be TN-C-S without PME arrangements or conditions, but not, at least in the UK, where the supply is provided to the consumer at LV, and the provisions of the ESQCR apply.


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