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Electrical Applications 2 by David W. Tyler

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54 Materials and their applications in the electrical industry
Example
4.
Select suitable conductors from Table
9D2
for the
following circuits. The currents quoted refer to the rating of
protective HRC fuse.
(a)
15
A, circuit length
10
m, nominal supply voltage
250 V
(No temperature considerations required.)
(b)
30
A, circuit length
25
m, nominal supply voltage
200
V,
ambient temperature 40°C.
(c)
10
A, circuit length
5
m, nominal supply voltage
240
V,
ambient temperature 50°C.
(d) With the details as in (c) above but with four identical
circuits contained in a conduit.
The characteristics of semi-conducting