Answer Posted / shahidul islam (srabon)

When the power is known in kW then the formula for knowing
the current in A is I=(P/(sr(3)*V(phase)). Now we the
current. After finding the current we know that the current
density of copper is 2.5. Finally to calculate the cable
isze we apply the given formula in practice.
I=A*2.5
so, A=I/2.5 (in square mm)
Where A=Area of conductor or here cooper is used
A=w*l
w=width
L=length of the conductor
Hope the answer of the question

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