The minimum copper coating thickness necessary for successful earthing on copper bonded earthing rods is 250 microns (0.25 mm) as provided by international standards like IEC 62561-2, UL 467, and BS 7430. Such a heavy, even copper coat is important for long-term corrosion resistance and good electrical conductivity, particularly because the rods tend to experience mechanical strain wh... https://www.pioneerpowers.com/copper-bonded-earth-rod.php