Electric motors and appliances in private homes and onfactories are connected to the electrical wiring of various types of cable. The type of current in the wiring is variable. Wide use found cable VVG. Project organizations most often include this wire in the project specification. Decoding of VVG-wires helps manufacturers in the selection of the desired material. Special designations allow to distinguish the types of wires. Marking cable VVG, the decoding of which is applied to the insulation, competent electricians will tell everything.
What are the types of cable VVG?
Abbreviation of cable decoding carriesinformation on its manufacture. She informs that it is recommended to connect and in what way to lay, external or underground, where it is allowed to use and what permissible air temperature is recommended.
Sale of materials used inpower supply, and a huge range of wires according to the type of insulation and design, provide an opportunity for the buyer to opt for the products he needs. Beginner electrics and ordinary consumers will be interested to know how many varieties of brands cable VVG with decoding is available on the market sales.
Protection of the cable from open flame was created by manufacturers of cable products. Invented and applied fire insulation VVG. Below is the layout of the modifications:
• VVGng;
• VVGng FrLs;
• VVGng Ls;
• VVGNG Hf;
• VVGng FrHf.
Each letter in the marking and name has a decoding, VVG t, VVG ng is not just a set of letters. Therefore it is necessary to familiarize yourself with the notation.
We will deal with the notation
Group laying is performed by conductor Hg.The released material is VVG Pnga, the decoding of which suggests that the copper lived. The modification of the VVGng wire informs us that this type is not afraid of fire.
The name of the cable VVGNG Ls is deciphered, carrying the information that during a fire the insulation of the wire gives off a minimal amount of smoke.
The cable VVGNG FrLs with an open flame does not contribute to the fire. Due to melting insulation, smoke is minimal.
The next type of product - with decoding VVGNG Hf. When it is exposed to heat, for example, during a fire and insulation melting, gases are absent. Wiring does not corrode.
The latter type of wire VVGng FrHf has all the best characteristics of the above cables.
Isolation of products
To the insulating material used incable production, special requirements, including from the fire service. PVC material (polyvinyl chloride) harbors one distinctive feature in relation to other polymers used for the manufacture of plastic goods. PVC products do not interact with fire. Due to this property, polyvinyl chloride is used in the manufacture of insulation coatings for cable.
Materials for the manufacture of cables:
- The main type of VVG insulation materials is a two-layer insulation coating. Material PFH (polyvinyl chloride). Additional insulation is missing.
- The insulation of copper wires of cable VVGng is made of non-combustible PVC materials.
- Halogen-free PVC, used as an insulating material for the VVG Ls wire, does not emit smoke during its melting. Used when installing electrical wiring, in crowded places.
- Cable pulling, where it is possible to igniteIt is made of brand VVGng FrLs. The provided insulation is fire resistant and does not emit dangerous smoke. A cable with VVGNG FrLs decoding is used for closed and open installation with a high degree of fire hazard.
We will understand the labeling of the cable. Let's get acquainted with the VVG-decoding of the wire:
• P - polymer wire insulation.
• B - polyvinyl chloride.
• PV - a group of materials based on polyethylene.
Decoding the following letter designation allows you to find out the composition of the cable insulation.
• B - PVC outer insulation.
• Shv - protection of veins in the form of a hose.
• P - external polymer insulation.
• Shp - external insulation of a polyethylene hose.
Cable protection VVG (interpretation below) against mechanical damage has its own designation.
• B - armored cable with hard coating.
• G - flexible cable. No special protection.
• VVG PNG a wire, the decoding of which is presented above and clearly indicates its purpose.
Cable cross section and its value
When installing electrical networks important correctlyselect the conductor section. The transfer of current depends directly on the cross-section of the wiring. Engines and appliances connected to the network, consume electricity. Electrical wiring as it passes through the current begins to heat up. Heating the wiring when the cross-section of the core is not properly selected can lead to an involuntary fire. The cross section of the wires must be taken to thirty percent more. In the cable there are current losses that need to be foreseen in advance. After completing the hidden wiring in the house, it is difficult to replenish losses in the future.
VVG device PNG a
The cable section of this type is from 1.5 to 16 squares. The number of wires he has is two or three.
Wire symbol symbols:
- B - PVC insulated conductors.
- B (second) - PVC-sheath cable.
- G - no cable protection.
- P - the arrangement of the veins is parallel, flat.
- Ng - burning insulation is not supported.
Cable section VVG-PNG A:
- copper conductor of the round form single-wire first class;
- insulation material - polyvinyl chloride;
- color wiring;
- PVC sheath, reducing the properties of combustion.
The main use of this type of cable is in the transmission and distribution of AC electricity at 50 Hz, 0.66-1.0 kV.
VVWOG cable
The great demand in the field of cable products is caused by a cable with a section of 3x4 marks VVGOG. The composition of this copper cable includes PVC insulated conductors.
Explanation VVG ozh:
- B - vinyl insulation.
- In (second) - vinyl shell.
- G - naked.
- Ozh - single-wire cores.
VVGozh cable design
Conductor, conductive, copper, first or secondclass GOST 2483. The form of a vein round or sector form. Belt insulation made of PVC plasticizer, burning on open fire insulation is reduced. Twisted cable conductors of two, three, four and five lived around the core of PVC. The outer sheath of the cable is made of PVC plasticizer that does not support combustion.
PVC cable insulation. Cable wiring in various colors. White or yellow. Blue and green. Black or brown, red and crimson.
Scope of cable VVG PGN
Cable operation is permitted on land, in rivers and lakes. It is used at temperatures from -500C to +500WITH . The height of the strip above sea level is allowed at an altitude of 4300 meters. Cable can be laid in the ground, water, in the air, that is, on poles and along the walls of buildings and structures.
All of the above characteristics apply tocable VVGozh, the decoding of which tells us that the wire is made of copper conductors with a section of 3x4. It is used in the northern regions and in areas with temperate and tropical climates.
Tips for building power grids
Installation of cable with VVG decoding can be carried out bywalls of buildings and structures. Laying is carried out on the pillars and hangers on the ropes. The use of this type of cable is allowed where there is no risk of fire. It is better to lay it on plastered walls or walls made of plasterboard.
With the threat of mechanical damage to the cableneed to protect. Excellent protection are pre-installed steel pipes, in which wire is inserted. The most justified such laying in wooden houses. Corrugated sleeve that protects the layout, is widely used in construction. Various cable protection channels are also used. Laying in strobe products with decoding cable VVG is not recommended. For this, the use of the explorer VVGng is preferable. It is designed for hidden wiring. There are recommendations and regulations in which the rules of installation works are written using the cable VVGng.
Rules for outdoor work with cable products
When laying the conductor VVG in the ground mustfollow strict rules. Cable protection of this type is absent. The use of concrete boxes, cable ducts and pipes prevents mechanical damage to the cable. Signal protection is now widely used instead of red brick used earlier. Made protection in the form of polymer plates, which have excellent indestructible characteristics.
A sand cushion is poured into the trench.A cable is laid on it, on top of which the earth is poured and tamped. The thickness of the sand layer should be at least 20 centimeters. After filling the cable, place the protective plates, which are also covered with sand. On top of the sand is laid signal tape, warning of the presence of a laid electrical cable.
Laying armored cable - the most correctearthmoving solution. The cost of its installation is higher than the cost of the VVG cable. The service life is the same, but the guarantee of protection against damage at the armored wire is much higher.
Ознакомившись с этой статьей, простой покупатель, not an expert, correctly selects the required cable. Based on the fact that the market today offers many types and types of cable, it is very difficult to make a choice without certain knowledge in this area. If the purchase is still in doubt, it is better to consult with the seller of electrical wiring. This is very important, because the quality of the occupants depends on the quality of the wiring.
