The Neutral wire and Earth wire are normally connected together at your service panel board. Neutral wire is the normal or return path of the circuit. Earth wire is a safety protective wire for the human body and electrical equipment’s from fault condition.
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⇒ Neutral wire is directly connected to the neutral point of the supply system.
⇒ Earth wire may be directly connected to the neutral point to the supply system.
⇒ Neutral wire serves as a return conductor.
⇒ Earth wire may carry current only in case of a fault.
⇒ Neutral wire is potential at some point may be substantially far from zero.
⇒ Earth wire is supposed to be at zero potential.
⇒ Neutral wire is therefore insulated from the pole on which it is supported. In this case, the insulator is smaller size than the one supporting the phase conductors.
⇒ Earth wire is not mounted on any insulator and is it direct metallic contact with the support metals work.
⇒ Neutral wire may not be connected to earth at an intermediate point in the line.
⇒ Earth wire must be connected to earth at least 3 places in a kilometer or at 4 places an a mile.