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Here's a little more info
Installation and measurements of earth electrodes - Electrical Installation Guide
The interesting factor here, not specifically mentioned in the link, (although distances between the rods are mentioned), are the zones of influence between each of the installed earth rods and why there is an optimal distance. which would indicate the fall off potential so that there is no overlapping gradient between each of the electrodes
Installation and measurements of earth electrodes - Electrical Installation Guide
The interesting factor here, not specifically mentioned in the link, (although distances between the rods are mentioned), are the zones of influence between each of the installed earth rods and why there is an optimal distance. which would indicate the fall off potential so that there is no overlapping gradient between each of the electrodes