Power cable is an electrical insulated conductor designed to transfer electricity mainly by current currents. This variety of conductors was widely used in lighting and power electrical installations.
It should be noted that they differ in some way with universality, since they are in demand not only for a stationary laying, but also for connecting various moving objects:
production units, technological equipment and t. D.
Most often, the power cable is used in constant voltage networks, in which the rated current is at different levels.
In this case, it performs the transfer and subsequent distribution of electricity flows to the nominal voltage prevailing in the network. Due to this, such cables are 2 types: for low and high voltage. Their internal structure may include from one to four conductive cores, depending on the direct purpose.
In order to reduce the loss of electricity during its transportation, to the final point of the cable are made of metals with minimum resistance, t. e. aluminum and copper. Based on the power of the transmitted energy, the cross -section of the cable cores is also different. The standard scheme provides for one or more monolithic or multi -core cores, which are covered with a layer of insulation.
The advantages of cables made of stitched polyethylene of cables from stitched polyethylene compared to traditional types of insulation, paper-focused and PVC, have a number of the following advantages:
· A higher degree of resistance to heating;
· The ability to transfer increased current loads (depending on the cross section);
· Small dielectric losses;
· Large throughput due to an increase in operating temperature;
· Small weight and bending radius, due to which the laying on complex routes is facilitated;
· A high level of thermal resistance during short circuit;
The possibility of use on routes with an unlimited level of levels.
It should also be noted that in favor of the cables sewn from polyethylene, small costs for their installation and high service life are indicated. All this, together with excellent operational characteristics, make them more demanded in various sectors.
Here you need to pay attention to such a special variety as a combined cable. These conductors are used for power supply and transmission of video signals and control signals of various types directed to remote active equipment, such as switches, video surveillance cameras, industrial controllers, alarm systems, and locking on railway tracks, etc. Waterproofing in such radio frequency cables can be made of continuous and foamed polyethylene. For outdoor laying, combined cables with a shell of light -stabilized polyethylene are used. The use of such cables significantly reduce the costs of organizing or reconstruction of cable lines.
