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Electrical Applications 2 by David W. Tyler

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Materials
and their
applications
in the
electrical industry
51
A very small part of Table 9D2 is given below.
Current-carrying capacities and associated voltage drops for twin
PVC-insulated cable, non-armoured (copper conductors.)
Conductor cross-
sectional area
(mm
2
)
1.0
1.5
2.5
4
6
10
16
One twin cable sini
Current-carrying
capacity (A)
14
18
24
32
40
53
70
%le-phase
a.c. or d.c.
Volt drop per
ampere per metre (mV)
42
28
17
11
7.1
4.2
2.7
Correction factors for ambient temperatures when using fuses to
BS 88 or BS1361. (HRCfuses.)
Ambient temperature
Q
Factor
25 35 40 45 50 55 60 65
1.06 0.94 0.87 0.79 0.71 0.61 0.5 0.35
EFFECT OF AMBIENT