System$-$I

to$-$ a$)$ The three$-$phase line in the above System$-$I feeds three different loads. The transformer voltage is $240$ V as line$-$to$-$neutral. The voltage value at the maximum voltage drop point is required to be $230$ V as line$-$to$-$neutral. The feeder's conductivity is $56\frac{m}{?}$ ohm. $m{m}^2.$ The nominal voltage of the line as line$-$to$-$neutral is $230$ V $.$ Find the cross$-$section of the line, calculate the voltage drop between points A and B $,$ and find the value of the maximum voltage drop in percent. $(30$ pts $).$

b$)$ The three$-$phase line in the above System$-$II is fed from both sides. The nominal voltage of the line is $230$ V as line to neutral. The feeder's conductivity is $56\frac{m}{o}hm.m{m}^2.$ Find the distance from point A to the maximum voltage drop point and find the cross$-$section of the line by considering the maximum allowed voltage drop as $4\%(35$ pts $)$