What is a control cable? What are its features?
Release date:
2022-12-19 16:10
Source:
Control cable This is a PVC-insulated and sheathed control cable, suitable for industrial and mining enterprises, as well as energy and transportation sectors, used in control and protection circuits with AC rated voltages up to 450/750V. The control cable features moisture-proof, corrosion-resistant, and damage-preventive properties, making it ideal for installation in tunnels or cable trenches. Power cables are designed for transmitting and distributing high-power electrical energy along the main lines of power systems, while control cables serve the purpose of directly connecting electrical equipment and appliances to power sources from distribution points within the system. Power cables typically have rated voltages of 0.6/1kV and higher, whereas control cables primarily operate at 450/750V.
The rated voltage of control cables should not be lower than the operating voltage of the circuit, and must also meet the requirements for transient and power-frequency overvoltages that may occur. To ensure that the operational range of control cables is limited in cases of insulation breakdown, mechanical damage, or fire, national standards mandate that critical systems—such as current, voltage, DC power supply, and trip-control circuits—which require enhanced reliability—must be equipped with two sets of systems featuring dual protection, each utilizing its own dedicated control cable.
When producing power cables and control cables of the same specifications, the insulation and sheath thickness of power cables must be thicker than those of control cables: (1) Power cables belong to two specific categories within the five main types of cables, whereas control cables are classified as electrical equipment cables. (2) The standard for power cables is GB 12706, while the standard for control cables is 9330. (3) Low-voltage power cables typically feature color-coded insulation, whereas control cable cores are usually insulated in black-and-white colors. (4) The cross-sectional area of control cables generally does not exceed 10 square meters. In contrast, power cables are primarily used for electricity transmission and usually have larger cross-sections. Due to the reasons mentioned above, power cables can typically accommodate much larger specifications—up to 500 square meters (within the range commonly produced by standard manufacturers)—though fewer manufacturers are capable of handling such large cross-sections. Meanwhile, control cables generally have smaller cross-sections, rarely exceeding 10 square meters. In terms of cable quantity, power cables usually come in 5-core configurations according to grid requirements, while control cables, designed for transmitting control signals, often feature significantly more cores—up to 61 cores as per standards—but can also be custom-manufactured based on specific customer needs.
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