Almost everyone who, at least several times, came across one or another work on the selection and installation of cable and wire products, I know exactly what a cable is. Let's get back to it again. So, cable is one or more insulated current-carrying conductors, covered with insulation, twisted together. The current-carrying conductors are enclosed in a sealed sheath. At the same time, an additional layer can also be located around the shell, which performs a protective function. That is, it prevents the destructive effect of environmental factors and various mechanical damage.
At the same time, the area of use of the products is very wide. It all depends on which cable is in front of us. For example, the cable can be power, for example aluminum AVVG 4x50 , and there are also control types of cable. As a rule, the power cable is used in order, firstly, to transmit electricity, and secondly, to distribute it and direct it to the final link - various mechanisms, devices, switchgears. Unlike power cables, control cables are used to directly connect electrical devices, apparatus and various clamp assemblies to a power source. It is widely used in control and automation networks, for signaling networks.
There is a classification of the cable and by the type of insulating layer, as well as by the type of cable sheath.
Products are usually divided into such groups:
- Cable with impregnated paper insulation and surrounded by a protective metal sheath.
- A group of cables, which has paper insulation, impregnated with a special non-flowing compound, is placed in a metal sheath.
- A group of cables that are plastic insulated with a metal or plastic outer sheath.
- A group of cables with rubber insulation, which, together with the current-carrying conductors, is placed in a plastic or metal sheath.
Also all types of cable that have been listed in the classification (as an example, Copper wire PVA 2x1 ) is divided into groups according to the rated voltage, according to the number of current-carrying conductors, according to the characteristics and type of the protective layer.
Note that the manufacture of cable and wire products is always a very responsible business, where mandatory compliance with all GOST, OST and TU standards comes first.
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