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What is earth leakage? Earth leakage is an unindented situation in which a conductor carrying current comes in contact with the earth or chassis of equipment, either directly or indirectly, causing a current flow to the earth. Earth leakages can be a result of insulation failure or electric shock (current flows through the human body to the ground). Working principle During an earth fault, the current flows directly to the earth by bypassing the load. This happens when a live conductor touches the earth directly or through the human body. This can be the result of insulation failures, wet surfaces or improper wiring. Under normal conditions, the vector sum of the current flow in phase and neutral will be zero. Earth faults cause an imbal ance in the current flow in the phase and neutral conductors (vector sum of the current would not be zero). Core balance current transformers or zero-phase current transformers are used to sense this current imbalance. • how to test Earth Leakage Relay of El...