What are the requirements for control cables

Conductor material and specifications: Control cables should use copper conductors to ensure good conductivity. The specifications of conductors should be determined based on the usage environment and electrical requirements. For example, when used in AC current circuits, the minimum cross-sectional area should not be less than 2.5mm ²; When used in AC voltage, DC control or signal circuits, it should not be less than 1.5mm ² 1.
Rated voltage: The rated voltage of the control cable shall not be lower than the working voltage of the connected circuit, usually 450/750V.
Insulation and protective layer: The insulation type and protective layer type of the control cable should meet the requirements of the laying environment and environmental protection. The insulation electrical strength and insulation resistance should meet specific standards, such as no breakdown between conductors at 1kV for 1 minute, no breakdown between conductors and shields at 3kV for 1 minute, and when each core wire is grounded with the other cores, the control cable should be greater than 10000M Ω· km, and the HYAT cable should be greater than 3000M Ω· km 3.
Core selection: The selection of cores for control cables should be determined based on specific requirements. For example, when the cross-sectional area of the core wire is 1.5mm ² and 2.5mm ², the number of cable cores should not exceed 24; When the cross-sectional area of the core wire is 4mm ² and 6mm ², the number of cable cores should not exceed 10 cores.
Metal shielding: Strong current circuit control cables may not contain metal shielding unless they are located in high voltage distribution equipment or parallel to high voltage cables for a long time to suppress interference; When the control cables of weak current signals and control circuits are located in environments with interference effects and do not have effective anti-interference measures, they should have metal shielding; The cable for the secondary circuit of microcomputer based relay protection and computer monitoring system should use shielded cable 2.
Working temperature and laying conditions: The conductor of the cable is allowed to work at a temperature of 90 degrees Celsius for a long time, and the laying temperature of the cable should not be lower than 0 degrees Celsius. The recommended bending radius for cables without armor layer should not be less than 6 times the cable shape, and the same applies to cables with armor layer or shielding layer