Why is Earthing Necessary

Why is Earthing Necessary Points : Why is Earthing Necessary Explain If all electrical equipment produced was totally insulated, then there would be no need for earthing. Unfortunately up to now, insulated covers or casings have been expensive to produce and so metal has been used. The use of metal means that if a fault occurred, the metal could become alive at anything up to mains voltage. Obviously some form of protection must be given against this the simplest being to earth the exposed metal work.