The voltage level of control cables is generally low voltage cables, and their rated voltage is generally below 1KV. This is because control cables are generally used for signal transmission and electrical control, and the voltage level does not need to be too high. In contrast, power cables, with voltage levels generally above 10KV, are used for transmitting electricity.
The rated voltage of the control cable should not be lower than the working voltage of the circuit, and should meet the requirements of transient and power frequency overvoltage that may be experienced. [3] To ensure that the control cable reduces the affected area in the event of insulation breakdown, mechanical damage, or fire, the national standard GB50217-91 "Code for Design of Cables in Power Engineering" stipulates that for two systems that require enhanced reliability, including dual protection current, voltage, DC power supply, and trip control circuit, independent control cables should be used.
