It is necessary to connect an earth wire to electric appliances having rnetallic covers.
It is necessary to connect an earth wire to electric appliances having metallic covers. Why ? How will you identify earth wire in household circuit ?
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The earth wire is connected to a metallic plate deep inside the earth. The metallic body of appliance is connected to the earth, which provides a low resistance conducting path for electric current. Hence, any leakage of current to the metallic body of appliance keeps the potential to that of earth. The user might not get a severe electric shock on touching such an appliance. Earth wire has green insulation, so it can be identified
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