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There are clear differences between control cables and common cable types such as power cables and signal cables in terms of functional positioning, structural design, performance parameters and application scenarios, and they cannot be mixed during type selection.
Control cables are mainly used in the control loops of electrical equipment to transmit control signals, command signals and status feedback signals, connecting the control system and the controlled equipment, which is equivalent to the "nerve endings" of the system. Power cables are used in the main lines of the power system to undertake the tasks of electric energy transmission and distribution, serving as the "energy arteries" of the system. Signal cables are mainly used to transmit weak analog signals or digital signals, such as sensor signals and instrument signals, with extremely high requirements for signal integrity.
The rated voltage of control cables is usually 450/750V, which belongs to the low-voltage category and is suitable for secondary loop control. The rated voltage range of power cables is wider, from 0.6/1kV to tens of kilovolts or even higher, for power transmission of different voltage levels. The working voltage of signal cables is lower, usually only tens of volts or even a few volts, focusing on signal transmission rather than power transmission.
The conductor cross-section of control cables generally does not exceed 10 square millimeters, because the load current of the control loop is extremely small, and the conductor cross-section does not need to be too large. However, they have a large number of cores, and standard products range from 2 cores to 61 cores to meet the requirements of simultaneous transmission of multiple signals in complex control loops. The conductor cross-section of power cables is much larger, ranging from several square millimeters to hundreds of square millimeters, but the number of cores is small, usually 1 to 5 cores. The conductor cross-section of signal cables is smaller, and the number of cores is determined according to the number of signal channels.
Control cables often adopt a shielding layer structure, such as copper wire braided shield or aluminum-plastic composite tape shield, to resist external electromagnetic interference and ensure the accuracy of control signal transmission. Power cables generally do not have a shielding layer, but the insulation layer and sheath layer are thick to meet the requirements of high-voltage insulation and mechanical protection. Signal cables have higher shielding requirements, and often adopt a multi-layer shielding structure of individual pair shielding plus overall shielding, and are equipped with drain wires for grounding.
The insulated cores of control cables are usually marked with white digital numbers on a black background, which is convenient for identification during construction wiring. The low-voltage cores of power cables adopt color-coded identification, for example, yellow, green and red correspond to phases A, B and C, blue is the neutral wire, and yellow-green is the ground wire. The cores of signal cables often use different color combinations to distinguish signal channels.
Control cables are widely used in control, protection and signal transmission systems in power stations, factories, mines, buildings and other places. Power cables are used in scenarios such as power plants, substations, power transmission and distribution lines, and building power supply. Signal cables are used in occasions with high requirements for signal quality, such as instrument control systems, data acquisition systems and industrial automation control systems.
Summary: Control cables are characterized by multi-core, small cross-section, shielded and low voltage, and are specially used for control signal transmission; power cables are characterized by large cross-section, high voltage and few cores, and are specially used for electric energy transmission; signal cables are characterized by high shielding, small signal and low voltage, and are specially used for precision signal transmission. The three types of cables perform their respective duties, and must be strictly distinguished according to the actual purpose during type selection.
