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31 August, 11:52

Describe how the metal case of an electrical appliance is connected to earth

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  1. 31 August, 12:02
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    This happens through the connection cord, that has 3 wires: 2 wires are used for power supply. The third wire is used to 'ground' the metal case, by connecting it to a special pin from the wall socket. The eletrical installation of the building connects all these ground pins to earth.
  2. 31 August, 12:19
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    Anything that is medal is connected to earth
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