January 2016
Intermediate to advanced
110 pages
3h 30m
English
Content preview from The IEE Wiring Regulations Explained and Illustrated, 2nd Edition
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Earthing
Simultaneously accessibe
parts Conductors or conductive parts
which can be touched simultaneously by a person or, where
applicable, by livestock.
Earth:
what it is, and why and how we connect to it
[IEERegs section 413]
The thin layer of material which covers our planet,
be
it
rock,
clay,
chalk or whatever, is what we in the world of electricity refer to as
earth. So, why do we need to connect anything to
it?
After all, it is
not as if
earth
is a good conductor.
Perhaps it would be wise at this stage to investigate potential
difference
(PD).
A potential difference
is
exactly what it says it
is:
a
difference in potential (volts). Henc ...
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