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Electrical Applications 2 by David W. Tyler

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52
Materials
and their
applications
in the
electrical industry
Example 1. A 240 V, single-phase circuit has a full load
current of
15
A and is protected by a 15 A, HRC fuse to BS 88.
The cable is that as specified in Table 9D2. The cable runs in a
region with an ambient temperature of 45°C. Determine the
required cross-sectional area of the cable conductors. Calculate
the volt drop in the circuit if the run is 20 m in length. Is this
satisfactory? (Reg. 522-8)
From the table, the correction factor for ambient temperature
= 0.79
The cable has to be rated at = 19 A
(Note tha