Earthing switch is used to earth the live parts during maintenance and during testing. During maintenance although circuit is open still there are some voltages on line , due to which capacitance between line and earth is charged. Before proceeding to maintenance work the voltage s discharged to earth, by closing the earth switch.
1. Maintenance Earthing Switch: These are two or three pole units with a manual operating mechanism.
2. High Speed Earthing Switch: These are operated by spring energy. Spring is charged by motor-mechanism.
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