Why is the metallic body of electrical devices connected to the earth wire?

(N/A) The metallic body of electrical devices is connected to the earth wire to provide a low-resistance conducting path for any leakage current to flow directly to the earth. This process,known as earthing,ensures that the potential of the metallic body remains equal to that of the earth $(0 \ V)$. Consequently,if a fault occurs and the live wire touches the metallic casing,the current flows to the ground instead of through the user's body,thereby preventing severe electric shocks.