The earthing system shall consist of a network of buried conductors forming the earth grid, providing the earthing connections to equipment ground terminals, equipment housings and structures. If the  calculated Mesh and Step potentials for this earthing system is less than the attainable mesh and step potentials, then the design is considered to optimum one.

The earth grid shall encompass all of the area of the sub-station within the fencing and also shall extend for approximately one meter o...

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