According to the DC level, electric cable or copper bar (it is better to use
electric cable for current below 3,000A and bare copper bar for current
above 3,000A) is usually used as the connecting wire. Calculation formula
for cross-sectional area of DC output wire:
A=I/J
A is the cross-sectional area of conductor, in mm2;
I is the rated output current value, A;
J is the current density, A/mm2