"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 ?