What is earthing and grounding means?

Earthing is done by providing an earth wire from the device to the ground.  if an earth wire is provided, it ensures a very low resistance path for the current to flow through it to the ground and therefore, it prevents the person from getting a shock.

Grounding is done for two purposes, first is to provide a path for harmonics in case of unbalanced load and second is to minimize the effect of high power surges. Grounding is done for the protection of power system equipment and to provide an effective return path from the machine to the power source.

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