Yes, copper bonded earthing rods can be conveniently extended for deeper installations, thus being very versatile for different soil conditions and grounding demands. The rods are made with threaded or non-threaded ends so that several rods can be firmly connected together using high-strength couplers of copper alloy or brass. By joining more rods to these couplers, installers are abl... https://www.pioneerpowers.com/copper-bonded-earth-rod.php