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from:Earthing Method of connecting most exposed metal work in a building and metal appliances to electrical Earth - nominally 0V. Windows and shelves are normally excluded but most metal pipes etc. are included. This means that in the event of a fault - eg. Live wire touching a metal case, then the earth will facilitate automatic disconnection of the mains supply (known as EEBADS * in the trade). This should cause the circuit protective device - fuse to blow, or MCB to trip. Country properties often have an Earthing rod to provide some protection - usually with an RCD as well.
In the wiring regulations the earthing wire is referred to as the CPC - Circuit protective conductor.
(CPC is also the initials of a supplier - Combined Precision Components).
* EEBADS stands for Earthed Equipotential Bonding and Automatic Disconnection of Supply.