Answer / ramendra shukla

If the cross sectional area of three phase(R,Y,B) &Neutral
are -

Cross sectional Area of Conductor,R = Cross sectional Area
of Conductor,Y = Cross sectional area of B; but the Neutral
size is half of phase then it is 3.5 Core.

And when -

Size(cross sectional area of Conductors R,Y,B & Neutral are
same then it is know as 4 core.

Answer / k.prakashchandra

If the currents in all phases are equal ,the current in
neutral is zero.Hence if the currents are almost balanced
the size of neutral conductor can be reduced to 50 % in
view of economy

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