Why earthing is required for electrical installation?

Answer 1

If an electrical device fails it can send current to the housing of the device or to any of the controls that are available to the user. "Earthing" or "Grounding" as we generally call it in the United States, causes that current to be shunted to ground, making life a lot safer for people and other living creatures.

In the scenario above, the "hot" wire touching an ungrounded metal box would become a death trap -- anyone touching it could "complete" the circuit and be electrocuted. If the box were grounded, then the hot would be short-circuited and the over-current protection should shut off the power before anyone touches it.

Similarly, a broken neutral wire in an ungrounded component could prove lethal to anyone who contacts the component and completes the circuit. Unfortunately,a neutral short to a grounded box would not trip the breaker, like a hot would, but at least there is a "path to ground" through the safety ground rather than through a person.

Answer 2

Safety. Any item not connected to earth ground may have a floating voltage accumulate, or actually be connected to the hot side of an AC outlet if the cord or outlet are miswired.

Grounding an item removes all charge from it, preventing risk of shock and sparking.

Answer 3

Earthing system is essential for every electrical system because whenever any fault occurs in a system then there will be the fault current. This fault current may higher in Amplitude. So this fault current may damage the System elements or any devices associated with the system. So as to by pass this fault current to earth we need earthing. And the earthing line will have least resistance as much as possible. Because the current will prefer least resistance path than a higher resistance path. If fault occurs then the current will flow the least resistance path( Earthing line) and reaches the ground resulting in no damage to the devices

Answer 4

earthing is a safety feature in an electrical system. Earthing provides a quick, easy & safe path for curent if there is a short circuit, leakage in an electrical system.

Answer 5

to avoid gettin a fatal shock