Answer Posted / s. prakashmurthy

The earth connection improves service continuity and avoids
damage to equipment and danger to human life.
The object of an earthing system is to provide as nearly as
possible a surface under and around a station a uniform
potential and as nearly zero or absolute earth potential as
possible.In general, all parts of apparatus other than live
parts,shall be at earth potential which is always at a zero
potential.
( This information is referred from IS:3043 - 1987 for the
benefit of readers ).

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