VVGng (A) cable: characteristics, scope, selection rules

The versatility and durability of the VVGng (A) cable has influenced the fact that it is actively used by both experienced and novice craftsmen. This product is increasingly used in conditions of high humidity, as well as in those buildings that belong to the fire hazard category. That is why VVGng (A) wire is considered a versatile material that is ideal for solving various problems.

a brief description of

Manufacturers attribute the VVGng (A) wire to one of the types of power cable, with which each master can carry out the power supply to various indoor units, as well as powerful cable devices and structures. In the power element, all cores are twisted together and covered with a common insulating layer. A high-quality cable design is able to withstand the effects of various negative factors.

Depending on the specific type, the VVGng wire can have from 1 to 5 cores. In the household industry, products with two conductors are most often used for arranging home wiring, more of them are needed only for large-scale production workshops, as well as industrial enterprises. The minimum section size is within 1.5 mm². But in some cases this figure can reach up to 230 mm². The cross-section of the cable depends on the thickness of the main conductive cores.

Wire marking means the following:

• B - vinyl type of coating.
• D - bare cable.
• NG is a non-combustible material.

The durability of this wire is achieved due to the fact that the product has a bare core, which is covered with a double layer of PVC insulation. When there is no big A on the cable, it means it is made of high quality copper, not aluminum.

Wide range of applications due to the presence of the following performance characteristics:

• Frequency - 50 Hz.
• Manufacturers do not recommend laying cables if the ambient temperature is lowered to -15˚С.
• The optimal operating voltage is from 660 to 1,000 V.
• Ignition of working veins is possible only if their temperature reaches + 250˚С.
• The minimum bending radius of a wire with one core is 7.5% of the cross-section, for multi-core models this figure is increased to 10%.
• In conditions of high humidity, the operating temperature for VVGng (A) is in the range from -50 to + 50˚С.
• The average service life is 30 years. The cable is backed by a 60 month warranty.
• The indicator of the highest temperature of continuous heating of conductors should not exceed + 70˚С.
• Under normal operating conditions, the electrical insulation resistance level is 12 Mohm / km.

As a recommendation, you can remember that you can store the VVGng (A) wire only under those conditions that are prescribed by the manufacturer himself and comply with GOST standards. Otherwise, the warranty period may not only be reduced, but completely canceled.

Design differences

High-quality wire VVGng (A) consists of a central conductor that conducts electric current, as well as insulation and an outer sheath made of polyurethane or polyvinyl chloride. All production technologies comply with applicable legal standards. The final marking is applied in strict accordance with the rules and has its own registration.

Almost all types of cable are marked with a large letter B, which signals that the internal insulation contains a component based on polyvinyl chloride. It is able to protect the core from all kinds of damage, and also well prevents unwanted penetration of electromagnetic interference. If the master decides to choose a product with polymer insulation, then he needs to know that this option is most suitable for outdoor installation, since the cable can be fixed without a special box.

To make it easier for consumers to navigate the types of power wire, manufacturers have provided for the presence of special indices, which are marked with the usual abbreviation:

• K - a product with a round cross-section.
• О - standard single-wire cable, consisting of only one core.
• C - universal wire, which is divided into special sectors.
• M - multi-wire version, consisting of several insulated conductors at once.

It is worth noting that the sector version is extruded with a high-quality thin shell, which can have a different angle of inclination. Many manufacturers are accustomed to using the "+" sign in their arsenal, which means grounding, as well as a neutral wire in the attached description of the diameter and cross-sectional area of ​​the central core. The VVGng (A) cable differs in actual voltage, which is indicated by the letters PE and N. The final figure depends on the technical characteristics of the wire and its throughput.

Modern cable varieties

Experienced craftsmen know that in the process of single laying of electrical units, their ignition is simply impossible. If the VVGng wire is laid together with other types of wires, then it must be treated with a high-quality anti-flame agent. This is what the abbreviation "ng" testifies to.

But for the VVG base cable, manufacturers have provided for the presence of PVC insulation. Such a product will always have self-extinguishing and fire retardant properties.

Contemporary masters more and more people prefer to use the following types of cable:

• Standard VVG cable. This wire has a round shape, a powerful core is located in the center, which is covered with a layer of plastic or PVC insulation. Such a product is used for installation in residential premises: private houses, apartments, offices. The main difference is affordable price and acceptable quality.
• VVGng (A). Power copper cable with a round cross-section, inside which there is a central core in a universal flexible mesh winding. External insulation is made of PVC. Such a cable is quite often used by large industrial complexes, since it has a number of significant advantages: increased resistance to kinks, it contains non-combustible materials.
• VVG-P. A flat copper wire, which is designed for laying in places where there are large temperature differences. Many craftsmen value such a wire because it is equipped with an additional layer of insulation, and is also repairable and has the necessary durability.
• VVGng - ls. This cable has a round cross-section and is made of copper. In the inner compartment there is a high quality double PVC insulated conductor. The insulation power is due to the presence of plastic. Such a wire is not intended for those operating conditions where the air temperature can drop to + 5˚С and below. But, the cable of this series perfectly resists fire, and also does not emit smoke and soot in the event of exposure to an open flame.
• VVGng-P. High-quality wire with a flat cross-section, which compares favorably with all analogues in its multifunctionality and the presence of double PVC insulation, with the addition of plastic. It should be noted that polymers are equipped with an additional protective function, which contributes to a significant extension of the cable's service life.
• VVGng-P ls. Such a wire has increased flexibility and strength, which is highly valued in the industrial industry. The outer insulating layer is covered with a non-flammable polymer with a high degree of wear resistance. Manufacturers recommend using such a cable for professional installation in various production workshops, since it is completely safe and does not emit harmful chemicals.

Selection rules

Before purchasing one or another type of cable that will be used for wiring in a house or apartment, you need to correctly determine the required cross-section of the conductors. This is due to the fact that improperly selected wiring will not be able to cope with the existing load, and this can lead to a short circuit or even a fire. The cross section should be calculated with a small margin.

Quality cable can be selected according to three main parameters:

1. Section.
2. The form.
3. Veins.

For a standard VVGng (A) cable, the section parameter can vary from 1.5 to 50 mm². But, on sale, you can also find more powerful specimens that have a cross section of 400 mm². Most often, they are made according to individual orders for the implementation of expensive projects at large enterprises.

It should be noted that universal electrical products with a large cross-section have a higher conductivity. It is defined as the resistance of a conductor per kilometer of wire length.

The shape of the product affects the way the wiring is laid. Cable manufacturers VVGng specialize in the manufacture of several versions of such a product:

• Flat. All cores have a small cross-section, but they are laid along one plane.
• Round. Consists of cores of standard cross-section, always marked with a capital K.
• Segmental. Professional cable, each core looks like a certain part of a circle.

But the core of any wire always remains a core. VVGn (A) is available in both stranded and single-core versions. The total number of cores is always indicated by marking. For example: VVGng with a size of 3 * 2.5 belongs to the category of three-core products, the cross-sectional size is 2.3 mm². Depending on the type of cable, each core can consist of one or more separate wires, which are firmly intertwined. You can find out the exact characteristics from the marking.

Storage conditions

Quite often, situations arise when the performance of certain electrical work takes a long time. It is in such a situation that it is necessary to ensure the correct storage of the wire. According to established standards, VVGng (A) cable must be kept in the following conditions:

• The ends of the wire must be free of moisture. This can be avoided by using special end fittings or heat-shrinkable caps. The penetration of moisture entails a decrease in the quality of insulation and electrical strength, which reduces the operational life of the wiring several times.
• The drum with the cable must be flat. Only in this case it will not be damaged by the weight of its own weight.
• To preserve the bay, it must be intercepted with wire in 3-5 places, as well as wrapped in polyethylene.
• If storage in an open area is intended, then the drum must be closed. The shelf life is only 2 years. If there is a canopy above the cable, then it can be kept in such a place for a maximum of 5 years.
• When the bay has already been opened, then it must be carefully preserved in order to avoid the negative effects of direct ultraviolet rays and moisture.

Self-assembly errors

Many experts note the fact that home craftsmen often make the same error - lay overhead lines from VVGng (A) cable without using a high-quality cable or other auxiliary designs. In addition, when wiring is laid on wooden surfaces, the elementary fire safety rule is often neglected. But manufacturers always focus on the fact that the cable can only be contained in special fireproof channels.

An equally common mistake is the fact that many wires are laid in one box or tray. A preliminary calculation will help not to violate the required temperature regime and other indicators on which the safety of not only property, but also the people themselves depends. The calculation of all the necessary parameters is carried out according to the method, which is detailed in the PES.