Cable (wire) VVG consists of cores made of copper and covered with a layer of PVC. It has a flat shape and in most cases is used to transmit electrical energy with its further distribution in various stationary installations. This cord is nominally rated for voltages up to one kilowatt. Some brands work at higher rates. Such a cable can be laid both in dry rooms and in those that are characterized by high humidity. Often, VVG wires can be found in special cable blocks, overpasses, and even in open space. It should be noted that their laying is allowed in horizontal, inclined and vertical routes, as well as in places that are characterized by an increased level of vibration. The only place where it is not desirable to lay such a cable is underground. The main and most common VVG wires are described below.
VVG-P ng cable structure
Each core here is single-wire and has a round shape. Its nominal cross section can be up to 16 millimeters square. Used to make insulationpolyvinyl chloride plastic. It should be noted that the shell of individual cores has a different color. The outer ball is characterized by reduced flammability and in most cases has a white color. Laying is recommended to be carried out at a temperature in the range from 15 to 35 degrees of heat and humidity up to 98%. This power cable, like its other brands, has a flat design. The characteristics of the VVG-P ng wire allow it to be used at fairly high voltages.
Cable VVG-P ng LS
This variety is characterized by a reduced fire hazard, and the LS (Low Smoke) coding indicates that the product has a low level of gas and smoke emission. Since it does not spread combustion, it is most often used for the distribution of electrical energy in cable rooms, structures and installations, where the alternating rated voltage is from 660 V to 1000 V at a frequency of 50 Hz.
Structure of veins
The wire VVG-P ng LS has a core that conducts electric current, is made of copper and can be single-wire or multi-wire. If there are two or three cores in the twist, then they all have the same cross section, and if there are four, then the last one has a smaller one. It serves for grounding and is called zero. In the production of insulation, a special polyvinyl chloride composition is used, which is characterized by high resistance to combustion. The shell of each core has a different color, while the zero is always blue. The thickness of the inner layer is at least three millimeters. It should be noted that the gaps between the cores and the insulation of the PVC composition are filled with it.
Specifications
Installation and laying of this VVG wire is allowed without preheating at a temperature of at least minus fifteen degrees. For operation, the temperature regime is allowed in the range from -50 to +50 degrees. With regard to non-ignition, for this cable, the maximum temperature of the conductive conductors is set at four hundred degrees.
