PS
I see nothing wrong with putting rods etc in on TN systems as it helps to keep you installation "earth" near to local "earth" thereby reducing step/touch voltages but you might have to watch out for the gradient close to the rod itself though
I see nothing wrong with putting rods etc in on TN systems as it helps to keep you installation "earth" near to local "earth" thereby reducing step/touch voltages but you might have to watch out for the gradient close to the rod itself though