I understand if we touch the wire and were are on the ground it creates a complete circuit. So we get electrocuted.
But how does the ground or earth wire works, so that we don’t get electrocuted?
In: Engineering
If there is an internal failure that exposes the housing of the unit to live voltage, it immediately shunts it to ground causing a surge that will trip the upstream protection device.
Without it, it is possible for the housing to be energized after such a failure and wait for some poor soul to walk over and grab what they think is a perfectly safe electrical device.
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