Power cable VVG - the most popular and inexpensive conductor of electric current, used in almost all electrical work.
Technical characteristics of the wire depend on its type, marking, the number of its conductors, the cross section and other parameters.
VVG wires are manufactured according to GOST 16442-80
VVG wires are divided by the number of veins. There are 5 types of them - one is five-core.
Category 1 and 2 is used for the construction of a single-phase AC network. Single-core wire is laid in parallel in two rows, two-core - in one row. If one core is connected to the phase, the other is connected to 0. In this case, the neutral wire is most often blue or blue.
The third category - cable VVG 3 - is also a cable designed for AC networks, with the only difference that it also includes a grounding conductor that has a yellow-green color.
Four- and five-core cables are installed in three-phase networks. In the first case, 3 cores are phases, and the fourth is zero. In the other - added another earth conductor.
The cross section of all conductive wires ranges from 1.5 to 50 mm². If you fold them, you’ll get a cross section of the wire itself.
- In single-core cable VVG section of the core varies from 1.5 to 240 mm².
- In a two-wire cable, the maximum size is 95 mm².
- In the five-core reaches 50 mm².
With an increase in the cross section of the main conductors, the cross section of the grounding and zero conductors decreases.
All these parameters are indicated in the marking of the power wire. Let's give an example.
The VVG 4x cable has the following decoding: 4 - four-wire cable. The number “10” indicates the section in mm².
The most common models of VVG are those in which the wires having a different cross section - four or five-core - are laid.
Modern wires VVG come in different sizes, types and materials.
Conductors consist of 3 main components: conductors, insulation, containment. The composition of the individual wires depends on the destination. As a rule, it is the most commonly used power aluminum wire VVG. The design and material depend on 3 main factors:
- Operating voltage (network load) and power, from which the insulation thickness is determined.
- Maximum electric current and resistivity, which determines the size of the conductive conductor and the cross-section of the conductor.
- Environmental conditions (temperature, laying under the ground or on it, humidity, chemical composition of the environment or the amount of sunlight, etc.), which determine the composition and shape of the outer sheath of the wire.
Strong aluminum or copper conductors are used in power VVG wires, but small power wires can have solid conductors.
If the VVG wire is viewed in section, it can be seen that there are certain differences between the models that can withstand the power of 6-10 kV and 0.66-1.0 kV. They are based, as a rule, all the same: the insulation of copper wires of different colors (white phase, ground yellow-green, zero blue).
Then there is belt isolation, and then the differences begin. In low-power cables after the belt insulation, the shell is located immediately gray or black. In powerful versions, there are still insulating layers:
- Metallic and electrically conductive screen.
The outer diameter of the cable itself depends on the number of insulation layers and the number of cores present.
Where is the power cable VVG?
The power copper cable VVG is used for fixed installation in electrical networks, where the voltage is up to 1000 W and the frequency is 50 Hz. Wire VVG pave the wiring on the highway. If the installation is carried out in the open air, additional protection from direct sunlight will be required (cable tray, HDPE pipe, etc.), because ultraviolet IGW cable service life significantly reduces. When laying in the ground, additional measures of protection against mechanical damage to the shell are necessary. It should be remembered that in buildings and structures according to fire safety requirements, VVG is prohibited.
Where is the power cable VVGng applied?
The nonflammable copper cable VVGng is applied to stationary laying in power supply networks which tension to 1000 W and frequency is 50 Hz.
Cable VVGng can mount wiring in buildings and structures and in the open air. Wiring should be protected from the influence of direct rays of the sun, because ultraviolet can reduce the service life. When laying in the ground, it is necessary to use additional means to prevent various mechanical damage.
Where is the power cable VVGng-LS applied?
The VVG ng-LS cable is used for stationary installation in a network with alternating voltage up to 1000 W and a frequency of 50 Hz. It is mounted in the power supply network in different buildings and structures, used for group installation in cable structures, boxes and trays. According to the new fire safety requirements, the wire VVGng-LS should not be used in socially significant facilities (kindergartens, schools, etc.).
Manufacturers indicate certain conditions under which the VVG wires can be laid and operated.
- Installation can be made at air temperature not lower than -15 C.
- To operate in the limit -50 С +50 С.
- In non-standard cases, the temperature may rise to +70 ° C. In emergency situations (short-term), even to +80 ° C.
- Permissible humidity - not more than 98%.
- Warranty period is up to 30 years. As practice has shown, with proper operation, this period may be twice as long.
- Installation can be carried out by air. If the laying height exceeds 4,300 m above sea level, it is necessary to use special racks for laying.
- On production, where there is increased corrosive activity, installation must be carried out in special boxes.
Choose the VVG wire, the characteristics of which are described above, depending on the power consumption and the strength of the current passing through it. So, for lighting VVG cable 2 × 1.5 can be used, for the VVG 3X2.5 outlet (with grounding). A separate line is recommended for connecting household appliances. For example, for air conditioner VVG 4X2.5 or 3 × 2.5.
It is best to bring a 5x10 or 5x6 five-core cable to the house.
VVG wire: price
Buy VVG wire can be almost any electrical store. Its cost in most cases is quite low. The average price is 8 rubles per square meter.
Sale can be carried out wholesale and retail. Manufacturers individually provide discount offers and delivery methods. Before buying, be sure to check the certificate of conformity and passport. Remember that the choice of quality material depends on the availability of such documents.