The effectiveness of any earthed system relies heavily on soil conditions. Copper bonded earthing rods are meant to work well in most soil types, but knowing the environment optimizes their performance. In sandy or dry soils, resistivity is greater, and this may impact grounding efficiency. Deeper installation or extra rods might be needed as compensation. In loamy, wet, or clay so... https://www.pioneerpowers.com/copper-bonded-earth-rod.php