As folks have pointed out many time, a single rod will make little difference but if you have a dozen or two homes on a faulted segment then all those rods is getting down to a decent Ra. Also they are probably achieving some vague semblance of balance on the 3-phase you might only have low tens of amps imbalance to deal with and not the total of hundred-ish or so that simply adding the typical house values up gives.
The USA has had this for a while but not a very good specification (two rods of given size, no spec on Ra) and the ROI has been doing this with TN-C-S
It is a shame that AM2 did not go with the requirement for new properties to have foundation rebar bonded, etc, as that would get decently low Ra in most cases.
The USA has had this for a while but not a very good specification (two rods of given size, no spec on Ra) and the ROI has been doing this with TN-C-S
It is a shame that AM2 did not go with the requirement for new properties to have foundation rebar bonded, etc, as that would get decently low Ra in most cases.