How Does Earthing Give Protection?

How Does Earthing Give Protection? Points : how does earthing give protection to an electric circuit The usual method of earthing is to join to exposed metal work to earth via an earth continuity conductor connected to an electrode buried in the earth. In conjunction with a fuse, or other similar device, this then forms a Protective System. Thus if a live conductor accidentally comes into contact with any exposed metal, it is effectively connected to earth. As long as the overall resistance of the protective system is low, a large fault current flows which blows the fuse. This cuts off the supply and isolates the faulty circuit, preventing risk of shock and fire.