To date, in the field of electrical engineering use a variety of wires for various purposes. If necessary, to distribute or transfer electricity in stationary installations, the power cable VVGng LS has become widespread. This article will provide information about FRLS, its scope of application and its features.
The power cable VVGng LS is a universal type of wire, which is used to lay the electric line for various purposes. At the moment in the CIS countries distributed wire, which is produced at the plant in Rybinsk. This is due to the fact that the Italian company became the owner of this company. Using investments and new developments, REC / Prysmian began to develop electrical equipment for the high-tech segment in the market. Since the manufacturer has its own production in Russia, there are no costs for transporting equipment from Europe.
First of all, REC / Prysmian improved all the technologies that were used in the production of the plant in Rybinsk. A clear result of the fusion of technical progress was the cable VVGng LS in PVC insulation. Now there are more advanced models of power cables, but this type has already occupied its niche in the market due to the price, the ratio of technical characteristics, GOST standards. It consists of conductive wires, thermal tape, PVC insulation, fastening tapes, inner and outer sheath.
The size of the power cable VVGng affects the number of copper cores at its base. The minimum cross section of the core in accordance with GOST is 1.5 mm 2, and the wire itself may be much thicker, since the number of cores at its base may be more than ten. The maximum value of the VVGng LS section is 230 mm 2. The cross section of the working zero core directly depends on the phase conductors. With the main current-carrying core from 1.5 mm 2 to 2.5 mm 2, the cross-section of the zero working core will be from 1.5 to 2.5 mm 2, respectively.
Power wire VVGng LS is produced for distribution and transmission of electricity in equipment, which is designed for alternating current with voltage from 660 to 1000 volts, with a frequency of not more than 50 Hz. The indicator of fire safety for VVGng LS corresponds to GOST R IEC 332-3-96 category A. Corrosion activity of products during combustion - GOST R IEC 60754-99. With proper operation, the design can last more than 30 years. Weight depends on the number of cores in the core of the wire, their thickness, and the density of the outer sheath.
Decryption
Wire VVGNG REK / Prysmian) with PVC insulation has a low level of gas and smoke when exposed to high temperatures. Decoding marking LS - low smoke. Additional prefix FR - fire, increased resistance to fire. Due to the polymers used in the manufacture of insulation and the outer shell, the design has a relatively small weight per unit length. High strength increases the resistance to mechanical stress, providing good protection for power conductors. Interpretation of the abbreviation VVGng corresponds to the generally accepted rules:
- B - PVC compound sheath;
- G - bare power vein;
- NG - non-combustible material at the heart of the design.
Using conditional marking it is possible to briefly describe a specific type of wire, its technical characteristics and other properties. Decryption should be able to do a specialist in the field of electrical engineering, as well as sales assistants in stores. Additional lettering marks on the label will indicate some new features of the power cable VVGng LS (from REC / Prysmian). For example, AKVVGng LS means that this control cable has aluminum conductors and is equipped with PVC insulation.
Video " Cable production VVGng-LS »
Application area
The power cable VVGng LS (from the manufacturer REK / Prysmian) with PVC insulation is usually used in the industrial industry, in various household spheres, as it has optimal technical characteristics. This feature makes the power cable VVGng with PVC insulation from the manufacturer REK / Prysmian the most versatile, if necessary, to transfer or distribute electrical energy to various technical equipment.
The VVGNG LS cable (from REK / Prysmian) with PVC isolation well proved when transmitting AC and DC with high power. Using various designs it is possible to use it with multi-cable laying of networks and with single-cable, meeting all standards of GOST. This type of wire has a good level of security, which increases the service life in various conditions.
VVGng LS (from REK / Prysmian) with PVC insulation practically does not emit acrid smoke during smoldering. In the production of the power cable, isolation itself required special attention, since it is this element that must protect the copper conductors from exposure to high temperatures, humidity, mechanical damage and many other external factors. Virtually every power cable VVGng LS is rarely used in the usual installation of an electrical network in residential buildings. They are used more often in places that require increased safety of the electrical line - at work or in wooden houses.
Requires special attention. Its design uses a special fire-resistant PVC insulation, which does not ignite when in contact with open flame. The wire of VVGNG FRLS guarantees uniform transmission of electrical energy, control and monitoring signals to the connected equipment throughout the entire time.
Typically, this model is used in places with high requirements regarding fire safety. Can be laid alone or in conjunction with other conductors of electricity. In accordance with the standards of GOST VVGng FRLS (REK / Prysmian) has copper conductors 1-2 classes according to GOST.
Silicone rubber is used in insulation. It has a good level of resistance to high temperatures, under the influence of which the surface is ceramized. The outer shell is made of halogen-free polymers, has a low weight, which makes the design convenient for transportation and installation. Also, LS (REK / Prysmian) can be laid in places with high humidity, because PVC insulation has good resistance to condensate and is hermetically compressed.
It can be laid underground (tunnels, canals, trenches) or for pulling an electrical line through the air. Also, technical characteristics allow its use in the factories of the oil industry and enterprises for the production of chemistry. For additional protection, the power cable can be placed in special steel sleeves, corrugated.
One of the most common samples of cable production is cable VVG. Its technical parameters allow for the successful distribution and transmission of electrical energy. It is used in many areas and for different voltages.
Types and device
Manufacturers produce various modifications of this cable. In order to understand the differences between different cable brands, it is necessary to consider their designation and interpretation of each type of marking.
Normal performance of VVG cable
- If there is no letter “ BUTThis means that the material of the cable cores is copper.
- The first character " AT"Means the material of the dielectric insulation of the cores - polyvinyl chloride (PVC).
- The second character is " AT"Means the insulation material of the entire cable - also polyvinyl chloride.
- The letter " R"Means the absence of an additional protective shell or armor, that is," naked. "
Each wire in the cable has its own color. Typically, the phase conductors are red, but different manufacturers color-code differently, and the phase conductors may have other colors.
The ground wire is most often colored yellow-green, that is, the primary color is yellow, with an additional one or two green strips along the wire. The zero conductor is usually blue or cyan with a white longitudinal stripe.
The wires in the cable may be single core and stranded They are twisted and have PVC sheath protection.
The shape of the cross section of the cables are divided:
- Round.
- Flat.
Nonflammable cable VVGng
In rooms that are fire-hazardous, as well as in public buildings, cables that do not sustain combustion are required to transmit electricity. For such purposes, use non-flammable cables labeled VVGng. The last letters indicate that the cable insulation has non-combustible properties.
In turn, non-flammable cables are divided into several subspecies:
- VVGNG NF - this cable, being on fire, will burn, but the smoke emitted at the same time contains insignificant amount of harmful elements. The letters HF mean that the cable sheath is made of plastic with a reduced chlorine content. Due to this, the poisoning effect of smoke is reduced.
- VVGng-LSLTx - in this type of cable, the insulation of individual conductors, as well as the entire cable, consists of low-burning plasticizer, which during combustion produces less smoke, and with a low toxicity. Such conductors even during a fire retain their performance. They are used for AC networks with voltage up to 1 kV, or for DC networks up to 1.5 kV. It is allowed to use such cable in social institutions.
- VVGng -frls - such cable possesses high reliability as its conductors have the additional protection consisting of two tapes with mica. Each wire is insulated with thermal insulation. Over it is applied a plastic non-flammable shell with the properties of the lowest smoke emission. The veins are covered with insulation, and twisted. On top of them there is another protective sheath, consisting of two copper grids or tapes with a thickness of more than 0.1 mm. This protective sheath is covered on top with an insulating sheath of PVC. This type of cable is used in manufacturing plants, nuclear power plants, in areas with a high risk of explosion.
- VVGng - ls - this brand of cable has an insulation that, when ignited, practically does not form smoke.
If we briefly describe the main differences between the non-combustible cable VVGng and the cable VVG, then we can say that the cable VVG does not burn with a single strip, and the cable VVGNG practically does not support burning even with a group strip, in the same bundle with other cables. The remaining symbols added to the main marking improve the properties of the cable according to different parameters.
VVG cable and its forms
Depending on the shape of the cores and their number, the VVG cable is made of the following section shapes:
- Round.
- Flat.
- Triangular.
- Pentagonal.
The cable jacket is made of different types of PVC. Between the cores the gaps are filled with the same plastic. Some cable versions are equipped with a polyvinyl chloride cable. With a small cross-section of the wires up to 25 sq. Mm, the veins are not filled with plastic.
Cable conductors are divided into round and sector. Most often, cables with round conductors are single-core, and with sector conductors - multi-conductor.
Cable specifications
- Fire resistance is not lower than 180 minutes.
- Allowable heating temperature:
- at an overload of +90 degrees;
- in normal mode +70 degrees;
- in case of short circuit with preservation of functionality +160 +250 degrees, depending on the manufacturer. - Allowable bending is limited:
- single-core cable, the smallest bending radius is 10 times the cable radius;
- stranded cable, the minimum bend radius is equal to 7.5 cable radii. - The mode of operating temperatures is in the range of -50 +50 degrees. In the case of external cabling, UV protection is required.
- Cable laying conditions: up to -15 degrees. In the case of lower temperatures, the use of cable heating is required.
Cable characteristics are also largely dependent on the manufacturer. Before purchasing, you must carefully study the cable passport. The VVG cable has low cost at qualitative technical parameters. Therefore apply in many areas.
The number and cross section lived
VVG may have a cross section of veins 1.5-240 mm 2. The distribution network usually sells cables with a cross section of conductors not exceeding 35 mm 2. More powerful cables must be ordered separately. The number of cable cores is indicated by numbers, immediately after the letter marking. The first digit indicates the number of wires, and the second - the cross-sectional area of the wire.
There are cables with earth wires and neutrals of other sections. This is done to reduce the cost and save non-ferrous metals.
Continuous current
When choosing the most appropriate way is to select the highest current. There is such a parameter as a long-term permissible current, which depends on the cross section and the number of wires and the method of cable laying (closed or open).
Scope of application
VVG has become popular in stationary devices for the distribution and transmission of electrical energy with a voltage of 660-1000 volts at 50 Hz. These cables can be used in the environment, as well as in wet and dry rooms.
Most often the cable is used in homes, power plants, industrial plants, lighting devices, channels, tunnels and other various areas. When laying the cable in the ground, it is necessary to use additional protection, for example, a pipe.
Due to its resistance to burning, such a cable is widely used in conditions with a high probability of explosions and fires. The safety of its use is achieved through booking. When laying the cable for domestic needs, it is recommended to protect it with a metal sleeve, etc.
* The information is posted for informational purposes, to thank us, share a link to the page with friends. You can send interesting material to our readers. We will be happy to answer all your questions and suggestions, as well as hear criticism and suggestions at [email protected]
The VVG cable, which is also called the VVG power wire, is a demanded type of cable that has been developed specifically for the transportation and harmonious placement of electrical energy. The voltage at which it is able to function is:
- 220V / 380V;
- 660V / 1000V.
In this case, the nominal frequency is 50 Hz. The sphere of use of the presented electric wire is wide enough.
Features cable VVG
VVG cable should be considered one of the most durable. Its service life is approximately thirty years (however, the warranty period should traditionally be considered five years). The presented cable type, the technological parameters of which provide for laying dry and wetted rooms in the premises (where the degree of humidity can be 98%), as well as in the open air, is used more than widely.
For example, it is well suited in the process:
- laying in buildings;
- on specially equipped cable racks;
- it can be used in industrial premises;
- at power stations;
- in devices designed for distribution and lighting;
- in ordinary residential tick rooms, as part of electrical wiring.
In addition, the use of the presented cable type, as well as cable VVG 5 2 5 perhaps in:
- tunnels of national importance;
- watch structures;
- collectors
- channels and similar places.
It should be noted that the scope of use of the presented type of cable includes such rooms where there is a possibility of an explosion or, for example, fire. One of the key advantages of cables of type VVG should be considered the fact that with a single degree of laying (or in the process of so-called laying with a beam when using a cable of the type VVGng) they do not contribute to burning. Such a positive property becomes possible to achieve with the help of a dense shell, which is made of polyvinyl material and chloride origin.
The laying in the ground is strongly not recommended, although, exclusively in theoretical terms, it is allowed provided that there is low corrosiveness of the soil and the absence of any significant mechanical loads.
The presented cable in its standard configuration is extremely undesirable to lay under the plaster, because this requires the presence of an additional degree of protection. A characteristic feature of the use of this type of cable should also be considered that its construction is performed without additional heating. The temperature, however, should not be less than -15 ° C.
There are no restrictions on the difference in the levels on the route where the cable is laid. Thus, cable VVG should be considered one of the most versatile, which is why they are so in demand both by ordinary people and in enterprises.
Our company has a flexible pricing policy. Therefore, the prices of cable and wiring products, and in particular on power cable VVG, VVGng and VVGng-LS, significantly lower than the prices of competitors. We work directly with manufacturers, which allows us to react very quickly to changes in the market of cable products.
We value our customers, so our managers are always ready to provide any assistance to the client, that is, to you.
Power cable VVG (electrical conductor - copper conductors, PVC plastic - core insulation, PVC plastic - sheath, without armor) and its derivatives cables VVGng, VVGng-LSit is used for sewage of electrical energy in electrical networks with a voltage of up to 1kV, industrial frequency. Laying of the power cable is made both indoors and buildings, and outdoors. It is forbidden to use the VVG power cable for installation work in the ground without pipe protection.
Appearance of a flat cable VVG-p:
A vein is a rod of copper, round or sector section.
Insulation around each core of multi-colored PVC - plastic.
The cable sheath is made of black plastic.
The cores are marked with colors according to standards, marking of cores with strip colors is acceptable.
The VVG, VVGng and VVGng-LS cables are laid without additional heating, at an outdoor temperature of more than 15 degrees, and the level of the differential is not normalized along the strip. The power cable VVG is permissible to lay in the ground (only in pipes), along trays, in rooms and in air, the choice of any of the options should exclude any mechanical deformation of the cable and its tension.
Interpretation of cable marking:
1. _ - the letter is absent before the first AT, it means that the conductor is made of copper, if there is a letter BUT It means aluminum conductors.
2. AT - indicates the material of PVC insulation - plastic.
3. AT- indicates that the shell is also made of polyvinyl chloride.
4. R - “naked” means that there is no armor on top of the shell.
Specifications:
Cables brand VVG are made with a different number of conductors: 2, 3, 4 or 5 - core. That provides any needs of customers in the design and operation of electrical equipment. If necessary, these types of cables are used for single-phase networks with grounding and without it, and for three-phase with the same conditions, the presence of a grounding conductor is usually specified in the project, or the requirements of TIR.
The color performance of the cores is carried out in colors according to the State Standards and international marking standards. In this case, phase conductors are usually marked with yellow-green-red color, the neutral conductor is blue or blue, and the ground is either yellow-green or black, there are other combinations of colors.
Devicecable :
The cable conductors are made of copper bar of either round or sector cross section (this usually applies to cables of large cross section);
Conductors are PVC insulated;
The top layer of insulation or sheath is also made of PVC plastic, it does not collapse from solar radiation, does not let moisture through, and can withstand considerable temperatures for a long time.
Cable applicationVVG, VVGng and VVGng-LS :
Use in stationary conditions in a motionless mode.
Operating temperatures range from -50 to +50 Celsius with a relative humidity of up to 98%
In operating modes, the maximum heating of the conductive cores up to 70 degrees is allowed.
Emergency modes of operation are characterized by transience, so in these modes it can be heated to 160 degrees in 4 seconds.
The mounting radii of cable turns are 7.5 x D, where D is the cable diameter in cross section.
The cable is tested with rectified voltage 3.5kV.
The warranty covers the cable for 5 years from the date of commencement of operation.
The average cable life is 30 years.
The smallest insulation resistance when measuring with a megohm meter:
From 1 to 1.5 square meters. no less than 12,000 kilo-ohm mm
from 2.5 to 4 square meters. mm not less than 10,000 kilo-ohm
6 square meters. mm not less than 9000 kilohm
from 10 to 240 square meters. mm not less than 7000 kilo-ohm
brand VVGng not flammable - cable VVGNG apply where the laying of cables that do not support combustion. In addition, cable VVGNG highly in demand, due to the unusually high ratio of price and quality. In this cable, fire resistant plastic compound is used; in addition, in cable design, in contrast to conventional VVG cable, another PVC plastic sheath is used, which fills the air gaps between the wires, thereby preventing oxygen from entering in case of local ignition.
brand VVGng LS lack of smoke and gas during a fire - this cable does not support the propagation of fire when bundled. VVGNG LS is allowed for use at high-risk facilities, in particular, in power grids of NPPs of class 2-4. In addition to the use of NPPs, cable is widely used at construction sites of special importance.
brand VVGng FRLS resistant to high temperatures –
Table of the main sizes of power cables of the brands VVG, VVG ng and VVG-ng-LS
The power cable VVGng is used in places where the nonflammable cable is necessary. It should also be noted that the power cable VVGng is very popular, since the price / quality ratio of the power cable VVGng is optimal.
All detailed information about power cables of the VVG brand, as well as prices of the VVG, VVGng and VVGng-LS cables can be obtained by telephone from our managers.