Indeed, copper bonding earth rods can be lengthened to extend to lower, lower-resistance ground levels, something that is commonly required to gain the best earthing in poor ground conditions. The extending process is easy and is based on certain accessories to make secure and conductive contact. Accessories Needed to Extend Copper Bonding Earthing Rods - Threaded Couplers: They... https://www.pioneerpowers.com/copper-bonded-earth-rod.php