Explain how earthing can reduce the risk of receiving an electric shock
Provision of effective earthing, to protect against indirect contact, can be achieved in a number of ways, including connecting the extraneous conductive parts of premises (water pipe etc.) to the main earthing terminal of the electrical installation.
This would create an „equipotential‟ zone and eliminate the risk of shock if a person touched two different parts of the metalwork, liable to be charged at different voltages, under earth fault conditions.
It is crucial to ensure that in the event of an earth fault, the electricity supply is automatically disconnected.
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