In a 3-pin plug, the wire that is connected to the ground pin of a plug is also connected to the metal body of the equipment.
If any current leakage is appearing on the metal body of the equipment then, it must be discharged safely to ground. It will prevent the users from any electric shock while using the equipment.
If there is any serious fault on the equipment, it also makes the fuse blow, hence protecting the user. Therefore, the system should be properly earthed or grounded to prevent electric shock.
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