The VVG
cable (wire) consists of cores made of copper and coated with a layer of PVC. It has a flat shape and in most cases is used to transfer electrical energy with its further distribution in all kinds of stationary installations. This cord is rated for a voltage of 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 they can be laid in horizontal, inclined and vertical tracks, as well as in places that are characterized by an increased level of vibration. The only place where it is not advisable 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. For the manufacture of insulation, polyvinyl chloride plastic is used. 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 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 rather high voltage indices.
Cable VVG-P ng LS
This variety is characterized by reduced fire hazard, and the LS (Low Smoke) coding indicates that the product has a low level of gas and smoke. Since it does not spread combustion, it is most often used for the distribution of electrical energy in cable rooms, structures and installations, where an alternating rated voltage is from 660 V to 1000 V at a frequency of 50 Hz.
Vein structure
The wire VVG-P ng LS core, conducting an electric current, is made of copper and can be single-wire or multi-wire. If there are two or three veins in a twist, then they all have the same cross-section, and if four, then the last of them has a smaller cross-section. 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 burning. 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 polyvinyl chloride composition are filled due to it.
Specifications
Installation and laying of this VVG wire is allowed to be performed without preheating at a temperature of at least minus fifteen degrees. For operation, temperature conditions in the range from -50 to +50 degrees are allowed. As for non-ignition, for this cable, the temperature limit of the conductive wires is set at four hundred degrees.