1. Choose the appropriate cable type according to the purpose, laying location and working conditions of the marine cable
2. Select the appropriate cable section according to the working system of the electrical equipment, the type of power supply, the cable core and the load current.
3. According to the calculation result of the system short-circuit current, whether the short-circuit capacity of the segmented cable meets the requirements.
4. Check the line voltage drop to determine whether the line voltage drop is less than the specified value.