It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.

hello... where are you..? your answers are got deleted again and again

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well as we know both of them are scared of bugs but I think hobi will scream louder as his voice is deeper.... hii armyy