Why are cables armored and stranded armored?

I. Why should cables be armored and stranded armored? Cable plus armor layer in addition to enhance the tensile strength, compressive strength and other mechanical protection to extend the service life, but also through the shielding protection to improve the cable anti-interference properties. Commonly used armoring materials are steel tape, steel wire, aluminum tape, aluminum tubes, etc., including steel tape, steel wire armor layer with high permeability, has a good magnetic shielding effect, can be used for low-frequency interference, and can make the armored cable laying and free from wearing pipe and cheap and beautiful in the actual use of more. Different specifications of different roots of copper wire according to a certain order and stranding distance stranded together, it becomes a larger diameter conductor, this stranded large-diameter stranded conductor than the same diameter size of a single branch of the copper wire is more soft to make a good bending performance of the wire, the swing test is not easy to break for a number of requirements for the soft wire (let's say that the medical grade wire) is more likely to meet the requirements. From the electrical performance: the conductor is energized, due to resistance to consume electrical energy and heat. As the temperature rises, it affects the performance life of the insulation and protective layer materials. In order to make the cable operation, should increase the conductor cross-section, but the large cross-section of a single conductor is not easy to bend, poor flexibility, is not conducive to the production, transportation and installation and laying. From the mechanical properties and the requirements of flexibility, reliability, multiple single wire twisted together stranded, you can solve the contradiction.

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