Q:

Why does a correctly installed Earth wire provides protection against electrocution by a faulty electrical device? Because:

waelhammad
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2022-10-22
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Why does a correctly installed Earth wire provides protection against electrocution by a faulty electrical device? Because:

  1. it is made of thick copper wire so presents almost zero resistance.
  2. a fuse is located on eh Earth wire which will “blow” if excessive current fl ows.
  3. The Earth wire is connected to ground and to the metal case of the appliance.
  4. The on/off switch is on the Earth wire so that power can be turned off.
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waelhammad
2022-10-22
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C: A faulty appliance (with a metal case) may become “live”. If it does, a large current may fl ow through the earth wire, rather than through a person touching the case. The large current will blow the fuse which is located on the active wire (as is the on/off switch).

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