Calculate the cross-section and current moment of the a-arm marked in the figure for the underground cable network with copper conductors. (The currents given are in watts. The allowable voltage drop is 965. f(0)=1, k=56 m/0.mm) cross section 10 16 25 35 50 (mm) 70 95 120 150 current 58 77 100 130 155 185 (A) 230 275 315 355 20 m 40 m 90 m 20 m 25A 130 m 30 m 7A SA 30 m SA 15A 40 m 100 m 50 m 40 m a J 20A 18A SA 50 m 100 m 100 m 100 m ISA 10A 10A 20A 12A Calculate the cross-section and current moment of the a-arm marked in the figure for the underground cable network with copper conductors. (The currents given are in watts. The allowable voltage drop is 965. f(0)=1, k=56 m/0.mm) cross section 10 16 25 35 50 (mm) 70 95 120 150 current 58 77 100 130 155 185 (A) 230 275 315 355 20 m 40 m 90 m 20 m 25A 130 m 30 m 7A SA 30 m SA 15A 40 m 100 m 50 m 40 m a J 20A 18A SA 50 m 100 m 100 m 100 m ISA 10A 10A 20A 12A