Effective earthing is essential for grounded AC and DC electrical equipment and distribution systems. Earthing provides the level of safety required to protect personnel and equipment from shock and fire hazard. Low resistance earthing is also necessary for the protection of sensitive electronic equipment.

Routine testing and inspection of the earthing network associated with electrical distribution systems is essential because the efficacy of the system can be affected over a period of time due to corrosion or damage to metallic electrodes and earth connections. HVOTC test and inspect earth networks detecting and highlighting for repair any faults within the system.