Special cables designed to connect all kinds of electrical appliances, as well as wiring in residential or non-residential premises. There are many types of such wires, each of them has its own purpose and technical characteristics. Today we will describe the technical characteristics of cable VVG, also tell you what it consists of and what it is intended for.
- 1 Overview of VVG cable features
- 2 VVG cable structure
- 3 What are the requirements for wire VVG
- 4 Key technical characteristics of cable VVG
- 5 Average wire cost
Overview of VVG cable features
VVG cable belongs to the power and is an assembly structure of one or more electrical wires that are equipped with a wide cross-section and are under a dense shell. Similar wire for electricity transmission use often enough. You can use cable VVG like this:
- it is allowed to install the VVG wire as a constant for the electrical power supply to the premises;
- there is the possibility of burying it underground;
- can be poured with a solution of concrete;
- If specifications allow, cable can be installed in walls.
Such cable has single insulated conductors (power cables). It is used for industrial facilities such as:
- metallurgical plants;
- construction sites;
- agronomic power.
Many experts believe that the wire VVG refers to the most safe and beneficial in terms of energy consumption. it achieved through the additional protection available on it compared to other types of products.
The VVG cable is used in almost every house under construction, using products with a cross section of 2.5 square millimeters with three cores for outlets, and for lighting 3 by 1.5 models, although ground is practically not used for installing lighting devices. When installing electric stoves take more powerful wires 3 by 4, which are able to withstand the power of the oven with a hob. To correctly calculate the cross-sectional area of the product, it is necessary to calculate it by the formula, according to which there is 2 kW of load per square millimeter, with by this The power of a device can be found out through the data sheet or labeling.
VVG cable structure
A common power cable VVG varies in size, materials and types. Each of them includes such key components, as:
- protective shell.
The composition of each cable may differ from the other depending on the area of use, however, mainly for all needs, they use an VVG power cable based on aluminum. The material and structural features of each model, which belongs to the cable type VVG, can determined by the following factors:
- voltage and power determine the thickness of the cable;
- from maximum current and resistivity depends on one or another transverse size wire section and its conducting veins;
- the shape and composition of the outer shell are selected depending on external conditions, in particular, temperature, laying conditions (underground or ground) wires, air humidity, the chemical composition of the environment, the abundance of sunlight and the frequency of mechanical effects on the wire.
Aluminum or copper conductors are most commonly used for power cable VVG, although small models can be equipped with solid conductors.
Cable itself they may consist of 2-3 or 4 lived, there may be grounding and zero conductors. To make you comfortable, they are painted in different colors. So, zero conductors are painted in blue or blue, but grounding conductors are yellow and green. Be sure to take these colors into account when installing the wiring.
Wires that are intended to be laid in the ground or in open space may include metal armor, insulated with a spiral wire that wraps the cable, or it can be wrapped in crimped the tape. Also, such armor can be made of aluminum or steel, but in this case you will need to connect to ground.
Sometimes uninsulated wires are also used, this is an open type of wiring, but should be used only in extreme cases.
According to GOST, wire assembly may be flat or round. You can add to it non-conductive filler stripsto maintain the desired shape, which is sometimes required for a round cable. Some brands of wires, depending on the characteristics of the application are equipped with additional elements for the purpose of vertical or overhead use. These include, for example, structural supports made of steel or Kevla-like.
In some rare cases, power products for external overhead use are not equipped with a common shell. And some have sheaths for cores based on polymer or plastic.
What are the requirements for wire VVG
When creating the shell of this product, special materials are selected that able to resist the following:
- dungeon conditions;
- chemical fumes;
- impact loads;
- high temperatures.
When using the cable in the working conditions at the nuclear industry, ionizing radiation resistance is additionally required.
Any wires like VVG should have high level of fire resistanceso that there are no problems with them when burning, weigh a little, but at the same time have sufficient flexibility and durability.
For cables that are used for underground work, heavy metals and plastic made of polymer are used as sheaths, which significantly prolongs their service life and capabilities. Thus, special insulation allows to use the cable in the ground without additional protective boxes.
Subject to the launch of wiring in potentially dangerous places such as ventilation, sewage and where the risk of damage insulation is too large, you need to use special copper or aluminum coatings that can additionally protect the coating wires
Cable type VVG depending on the subtype of the model and scope of application are equipped with markings, letters on which mean the following:
- And - aluminum veins;
- B - reservation for special conditions;
- B - paper insulation;
- P - PVC insulation;
- HRP - insulation based on damped polyethylene and PVC;
- G - bare cable without insulation;
- ШВ - flat insulation on the basis of PVC.
Key technical characteristics of cable VVG
Cable type VVG can be installed under the following conditions:
- permissible application temperature from 50 degrees below zero to 50 degrees above zero;
- the required humidity is up to 35 degrees to 98 percent;
- without preheating, wires can be installed at a temperature of at least 15 degrees below zero;
- the minimum allowable bending radius when laying single-core wires of VVG is 10 outer diameters, and single-core wires VVGng - 15, respectively, if the cable is stranded - then 7.5 outer diameters.
Nominal frequency power cable VVG is 50 Hz. The permissible heating temperature of cable cores during their use is 70 degrees above zero.
The approximate lifetime of this product is about 30 years, and the manufacturer gives a warranty period of about five years from the date of its introduction into operation.
Average wire cost
The VVG cable is available for sale in specialized electrical stores throughout Russia and the CIS countries, its cost is predominantly low. The average price of a meter of such wire is mainly 8 rubles, however, in some cities, in particular, Moscow and St. Petersburg, it can reach 8.7 rubles per meter.
You can purchase these wires both at retail and wholesale, using special offers from domestic manufacturers. Before purchasing a product, be sure to check with the seller about the availability of a certificate of conformity to quality and standards, as well as a special passport. The presence of these documents indicates that the product is of high quality, and you will not have problems with its proper installation.
Installation wiring with appropriate skills can be done with your own hands, but if you are in this business beginner, it is better to entrust this work to specialists, so as not to endanger yourself and surrounding