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
Correction factors
C
a
0.87 or 0.94 if fuse is BS 3036
C
g
not applicable
C
f
0.725 only if fuse is BS 3036
Cj 0.5 if cable is totally surrounded in thermal insulation
Current-carrying capacity of cable
For each of the different types of protection, the current-carrying
capacity I
z
will be as follows:
Cable size based on current-carrying capacity
The table on page 81 shows the sizes of cable for each type of
protection (taken from Table 4D2 of the IEE Regulations).
Clearly the BS 88 fuse gives the smallest cable size if the cable is
kept clear of thermal insulation.
Check on voltage drop
The actual voltage drop is given by
mVx/
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