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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Circuit design
tables in Appendix 4 of the IEE Regulations list all the cable sizes,
current-carrying capacities and voltage drops of the various types
of cable. For example, for PVC-insulated singles, single phase, in
conduit, having a current-carrying capacity of
45
A, the instal-
lation is by reference method
3
(Table
4A),
the cable table is 4D1A
and the column is 4. Hence the cable size is
10.0
mm
2
(column 1).
Voltage drop
[IEE Regs 525]
The resistance of a conductor increases as the length increases
and /or the cross-sectional area decreases. Associated with an in-
creased resistance is a drop in voltage, which means that a load at
the en ...
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