Importance of Earthing

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Importance of Earthing

The earthing is essential because of the following reasons

  • The earthing protects the personnel from the shortcircuit current.
  • The earthing provides the easiest path to the flow of shortcircuit current even after the failure of the insulation.
  • The earthing protects the apparatus and personnel from the high voltage surges and lightning discharge.

Earthing can be done by electrically connecting the respective parts in the installation to some system of electrical conductors or electrodes placed near the soil or below the ground level. The earthing mat or electrode under the ground level have flat iron riser through which all the non-current-carrying metallic parts of the equipment are connected.

elctrical-earthing-1When the fault occurs the fault current from the equipment flows through the earthing system to the earth and thereby protect the equipment from the fault current. At the time of the fault, the earth mat conductors rise to the voltage which is equal to the resistance of the earth mat multiplied by a ground fault.

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