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A 240 sq. mm. cable has a diameter of

d=square root of 4A/3.14

d= 2(square root of A/3.14)

= 2(square root of 240/3.14

=17.48 mm.

Therefore your cable has a capacity of only 515 amperes in free air. If installed in a duct with three conductors your conductor will have an ampacity of only 350 ampers.

Alternative Answer

The answer is not straightforward, because it depends upon various factors such as the material from which the conductor is manufactured (copper or aluminium), the type of insulation employed, and the configuration of the cable (how many conductors), installation method, etc.

An Appendix to BS 7671:2008 Requirements for Electrical Installations, lists cable types according to these various factors, and specifies their current ratings.

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