Copper-Bonded Ground Rods meet the requirements of the world rigorous standard-UL. Ground rods are made by molecularly bonding process 99.9% purity electrolytic copper onto high tensile and low carbon steel cores to ensure a perfect and even bonding between the steel and copper. The copper layer whose minimum thickness is 254 micron met to IEC 62561-2 and UL standard. Standard size diameters being common used are 1/2" , 5/8" , 3/4" , and 1". Standard lengths being common used are 4' to 10'. Thread type ground rods are available for extensible the length of ground rods by coupling. Intensive Test and Inspection of Ground Rod Ground Rods should pass the following criterions of international standards as shown; Thickness Inspection Copper shell of each ground rod shall be passed the thickness inspection to ensure its protective coating. The copper shell shall not be less than 0.254 mm (254 micron) thick at any point met to UL 467 standard. Adherence of Coating Test There shall be no separation of the coating from the steel core when subjected to the test described as follow met with UL 467standard requirements. Peeling of the coating by the steel plates or the jaws of the vise shall be allowed. Bending Strength Test There shall be no cracking of the coating when subjected to the test met with UL 467 standard requirements. The application of force shall be such that the rod is permanently bent through a 30Ñ angle. Straightness Test Ground rod should be passed straightness test to ensure in its straightness and high tensile with acceptable sag. The deviation of every 305 mm ground rod shall be less than 3.05 mm
