what is the purpose of earthing
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Earthing is used to protect you from an electric shock. 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.
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1 To protect human lives as well as provide safety to electrical devices and appliances from leakage current.
2 To keep voltage as constant in the healthy phase (If fault occurs on any one phase).
3 To Protect Electric system and buildings form lighting.
4 To serve as a return conductor in electric traction system and communication.
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