Why power cables are armored and stranded

Armored power cables refers to power cables with metal materials armored protective layer, power cables plus armored layer in addition to enhance tensile strength, compressive strength and other mechanical protection to extend the service life, but also through the shielding protection to improve the anti-interference performance of power cables. Commonly used armoring materials are steel belt, steel wire, aluminum tape, aluminum tube, etc., which steel belt, steel wire armor layer with high permeability, has a good magnetic shielding effect, can be used for low-frequency interference, and armored power cables can be laid directly buried and exempted from the wear tube and inexpensive 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 power cable efficient operation, should increase the conductor cross-section, but the large cross-section of a single wire 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 line twisted together in the stranded, you can solve the contradiction.

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