Earth Resistance Maximum values accepted for different installations

Earth Resistance Maximum values accepted for different installations


Below are the resistance  values for different installations

Power Stations: 0.5 ohms,
Extra High Tension (EHT) Stations: 1.0 ohms,
33 kV Substations: 2.0 ohms,
Distribution Transformer (DTR) Structures: 5.0 ohms,
Tower Foot Resistance: 10.0 ohms