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
Residual current devices
[IEE Regs 542-11] [IEE Regs 412-06, 413-02-15 and
471-16-0]
We have seen how very important is the total earth loop im-
pedance Z
s
in the reduction of shock risk. However, in TT systems
where the mass of earth is part of the fault path, the maximum
values of
Z
s
given in Tables
41B1,
B2
and D may be hard to satisfy.
Added to this, climatic conditions will alter the resistance of the
earth in such a way that Z
s
may be satisfactory in wet weather but
not in very dry.
The IEE Regulations recommend therefore that protection for
socket outlet circuits in a TT system be achieved by a residual
current device (RCD),
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