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No, because electrical systems use earth as a reference of zero potential, however lots of electrical appliances use the earth as a reference point and dump a small amount of current to earth all the time in order to limit power spikes which can damage micro electronics, as long as the earth pin has good contact with the main earth terminal in an electrical installation this is not a problem. some larger appliances like water heaters and electric oven also leak current to earth while they are in use. This is another reason why there should always be a good contact with the main earth terminal.

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