October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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Safe and efficient earthing 149
situation arises when the impedance of the path to earth for fault currents is
excessive.
However ELCBs are now more widely used, even when not strictly
necessary in accordance with the above, so as to provide extra protection.
ELCBs are described in detail later in this chapter (pages 168-170).
Definition of earthing terms
The earthing of metal parts is achieved by connecting them to a 'protective
conductor' which is connected to the 'consumer's main earthing terminal'.
This in turn is connected via the 'earthing conductor' to the 'earth electrode'.
Definitions of these terms are given below.
Protective conductor ...
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