Power cable

Power cable is one or more conductors isolated. Serves the power cable for transmitting electricity anywhere.

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The design of the power cable depends on its purpose, and the place of application. The basis of any cable is conductive core and isolation. Although, depending on its purpose, the design can be more complex. Conductive veins are mainly made of copper and aluminum, most often from copper. The number of conductive cores, in this case, can fluctuate from one to four cores. Isolation in a power cable is done depending on the voltage and current strength of it, in order to exclude the likelihood of a breakdown of isolation. There are several types of isolation itself:

Paper insulation. Paper insulation, impregnated with a special solution, has quite good dielectric properties, low cost and very long life, is also capable of withstanding a voltage of about 500 kilovolts. But there is a significant drawback, it is its hygroscopicity, that is, secondary isolation is necessary, already from moisture, which is very inconvenient.

Plastic insulation is made of PVC or from polyethylene. Cables with such isolation, as a rule, are designed for a voltage of not more than 35 kilovolts. But this cable is inadequate and most often it is used in places where there may be a fire. It is very unstable to blows and other mechanical influences.

Rubber isolation is used in cables used in household appliances for electrical wiring and.t.D. Labor voltage, which are usually about 10 kilovolts. But such a cable has a significant plus – it is moisture resistance and flexibility, which allows you to use it in various environments.

The location of the cable is largely solved by the type of insulation used in the cable. Moreover, here are listed, only the main types of shells. In fact, there are much more of them.

There may be a variety of cores in the power cables. Three veins can be used to transfer single -phase voltage, for which in turn only two veins are needed, so the third is needed as ground, just in case. Four veins are used to transfer a three -phase variable voltage, for which in turn only three veins are needed, and the fourth in this case is used as a negative mass necessary for the operation of the device. And two veins can be used to transfer either single -phase voltage, or to transmit direct current.