Cables are also made up of many parts, such as the basic elements that can transmit information by current or electromagnetic waves.
The insulating layer is an element wrapped around the periphery of the conductor, which plays the role of electrical insulation, which can ensure the transmitted current or electromagnetic wave, and the light wave only travels along the conductor and does not flow outward, so that the potential of the conductor is isolated. It not only ensures the normal transmission function of wires, but also ensures the safety of external objects and individuals.
Coupled with the filling structure, many wire and cable products are multi-core. After these insulated cores or wires are paired into a cable, on the one hand, the shape is not round, and on the other hand, there is a big gap between the insulated cores.
Therefore, the filling structure must be added when the cable is completed, so that the insulated wire cores or conductor pairs will be out of round shape after the cable is completed. Secondly, there is a large space between the insulated wire cores, so the filling structure must be added when the cable is completed, so that it can better use the filling structure.
Shielding method is a component that separates the electromagnetic field in cable products from the external electromagnetic field; The protective layer is to protect the whole product, especially the insulating layer, when the wire and cable products are installed and operated in a variety of different environments. In addition, tensile members are also used, and the typical structures are steel-core aluminum stranded wire, optical fiber cable and so on.
Cables can also be used in many places. Let’s introduce them in detail.
One is used in power system, and the wire and cable products mainly include overhead bare wires, bus bars, power cables, branch cables, electromagnetic wires and power equipment wires and cables. Coupled with its application in information transmission system, the wires and cables used in information transmission system mainly include local telephone cable, TV cable, electronic cable, radio frequency cable, optical cable, data cable, electromagnetic wire, power communication and so on. In addition, mechanical instrument systems are available in almost all products except bare overhead wires, but mainly power cables, electromagnetic wires, data cables, instrument cables and so on.
In a word, wires and cables are the main carriers of power transmission and are widely used in electrical equipment, lighting lines, household appliances and other fields.
It is reported that fire-resistant cables are mainly used in high-rise buildings, underground railways, underground streets, large power stations involving fire safety and fire rescue, important industrial and mining enterprises and other places. For example, power lines and control lines for emergency facilities, such as fire fighting equipment and emergency guide lights; When using fire-proof cable, the safe laying temperature of the cable should not be lower than 0℃, and the recommended bending radius of the cable should not be less than 6 times of the cable outer diameter.
Steel armored cable should not be less than 12 times of cable outer diameter, and fluoroplastic insulated and sheathed cable should not be less than 8 times of cable outer diameter. I hope the above contents can help you.
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