The process of connecting metallic bodies of all the electrical apparatus and equipments to huge mass of earth by a conductor having negligible resistance is known as Earthing.
To provide an alternate path for the fault current to flow so that it will not endanger the user
To ensure that all exposed conductive parts do not reach a dangerous potential
To maintain the voltage at any part of an electrical system at a known value so as to prevent over current or excessive voltage on the apparatus or equipments.
All the people living / working in residential,commercial and industrial installations, particularly the operators and personnel who are in close operation and contact with electrical systems and machineries, should essentially be protected against possible electrification.
To achieve this protection, Earthing system of an installation is defined,designed and installed according to the standard requirements..