The choice of power cable should follow the following principles:
1. The rated voltage of the power cable to be greater than or equal to the rated voltage of the power supply system installation points;
2. The cable continuous permissible current should be equal to or greater than the maximum continuous current of the power supply load;
3. Wire core section to meet the requirements of the stability of power system short circuit when;
4. The cable length calculation is in line with the requirements of the voltage drop;
5. The line at the end of the minimum short circuit current should be able to make a reliable protection device.
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