Remark:
In the above table, the three-phase voltage is 380V and the single-phase voltage is 220V.
The input end of the distribution box is three-phase five-wire system, with a three-phase voltage of 380V
and a single-phase voltage of 220V at the output end.
4*X+1*X in the table: 4 represents L+L+L+N line, 1 represents PE line, X represents the main cable size;
If the single-phase voltage is 110V, then the international copper core cable model must be twice the size;