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Back to 'basics' - in reality but with respect to Regs definition, what is the [main] earthing conductor and its CSA

psychicwarrior

Good morrow

"Earthing conductor. A protective conductor connecting the main earthing terminal of an installation to an earth
electrode or to other means of earthing" :

Is it the DNO strapped conductor (could be a few steel strands) around the sheath of the supply cable into the MET, or the DNO conductor out the side of the Service Head into the MET  ?

Is it the conductor that runs out the side of the Service Head (or from the supply cable sheath) up into a consumer unit 'MET'  ?

Is it not, however, the conductor(s) running from the MET up to the [sometimes multiple] db/cu earth bar(s)  ?

As an aside,  how does one determine the CSA of the DNO provided earthing conductor (as defined)  to put on the EIC/EICR   ?

Regards, Habs

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    psychicwarrior said:
    Is it the DNO strapped conductor (could be a few steel strands) around the sheath of the supply cable into the MET, or the DNO conductor out the side of the Service Head into the MET  ?

    Either. The former sounds like TN-S with a PILC cable - those strands will be copper (mine at home are 4 x 4 mm²); the latter would be a TN-C-S supply.

    psychicwarrior said:
    Is it not, however, the conductor(s) running from the MET up to the [sometimes multiple] db/cu earth bar(s)  ?

    If there is nothing else in the terminal bar (main bonding) I think that you could regard the two pieces as one. Otherwise that bit is the CPC of the meter and consumer tails.

    psychicwarrior said:
    As an aside,  how does one determine the CSA of the DNO provided earthing conductor (as defined)  to put on the EIC/EICR   ?

    With a micrometer or a good quality pair of (electronic) callipers.

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