VVGG-LS cable, its weight and outer diameter

The popular VVGG-LS cable is designed for wiring equipment in rooms, outdoors, electrical installations (channels, tunnels, pipes, trays, etc.) under the condition that there are no tensile loads on the product. The equipment of this series is also used when it is necessary to provide increased fire safety.

VVGng LS from the cable VVGng is distinguished by the fact that its design uses insulation, which is not capable of emitting a large amount of smoke during smoldering.

In the name of the wire, the LS index means Low Smoke, which is translated as "low-smoke" (insulation and shell are made of a flameproof plastic that does not spread combustion).

Application

VVGng-LS cable is designed for operation in cold, temperate or tropical climates. This type of wire can be used both on land and in lakes, rivers at an altitude above sea level up to 4300 m.

The power cable is used:

• In the air, provided there is no danger of mechanical damage during operation;
• In dry or damp areas (collectors, tunnels, canals, industrial premises, structures subject to partial flooding, etc.);
• In blocks, on bridges, special cable overpasses;
• In hazardous areas;
• In fire-hazardous structures;
• For the laying of lighting group networks in explosive areas.

The cable weight ВВГнг-LS allows to apply it for vertical, horizontal or inclined routes. This type of non-armored wire can be operated in places with vibration.

It is not recommended to use for underground laying (in earthen trenches and ground) without the use of special protective cable systems (for example, metal hose or HDPE pipes), which exclude damage to the conductor sheath and maintain its operational characteristics throughout its life.

Design features

• The conductors are made of copper and can be single-stranded or multi-wire, have a sectoral or circular shape. GOST provides I or II class of flexibility.
• The insulation of the cores is made of polyvinylchloride plastic compound, which has increased fire protection and reduced smoke emission. Each insulated core in multicore cables is made of PVC of different colors. Traditionally, veins zero have a blue color, grounding is yellow-green or indicated by the number "0".
• The inner sheath of the cable is laid over insulated conductors, filling the voids between them and creating an additional refractory protective layer between the outer insulation and the core.
• The outer shell is made of a polyvinyl chloride compound and has an increased fire resistance. If the cable core diameter does not exceed 16 mm, filling of the space with a refractory special compound between the core and the outer shell is permissible. In this case, the inner shell is optional.

Diameter of VVGng-LS cable

The veins of a two-wire wire have the same cross-sectional diameter. If the number of veins is 3-5, one of them may be of smaller diameter. This is a ground wire or a null conductor.

The diameter and mass of the cable VVGng-LS are calculated depending on the number of conductors in the structure, the features of its design,

Main technical characteristics

VVGng-LS cable is used for laying and installation of power grids from power distribution boards or transformer substations to power consumption objects: production workshops, residential and administrative buildings, construction sites, utility and utility enterprises, etc. It is allowed to lay the supply wire in concrete trays , Tunnels, on supporting overpasses.

The wire Is designed for the transmission of electricity, whose power for an alternating current of 0.66 kV or for a constant - 1 kV.

The outer shell is made of materials that are not exposed to ultraviolet radiation, therefore it is allowed to lay the product in the open sun. VVGng-LS cable It is not recommended to use for laying in unprotected earth trenches.

• The permissible temperature of the air at which prolonged use of the cable can be carried out is -50 ... + 50 ° С
• Humidity of air is allowed up to 98% (at a temperature of +35 ° C)
• The cable can be laid at a temperature of at least -15 ° C
• Working temperature of heating of cores - +70 ° С
• The maximum t in emergency mode is +90 ° С (operation is not more than 8 hours per day and not more than 1000 hours during the entire service period)
• Non-ignition of insulation at t +400 ° С
• The length of the cable, whose diameter is 1.5-16 mm, is 450 m; For a cable with veins 25-70 mm in diameter - 300 m; If the diameter of the veins is 95 mm or more - 200 m.
• The warranty operational period from the date of commissioning is 5 years, from the date of manufacture - no more than 6 months.
• The service life is up to 30 years

Quality control

The following control methods allow us to make a preliminary conclusion about the quality of the cable, if the values obtained from the regulated ones differ significantly. However, the final conclusion on the compliance of this material with GOST can only be made after conducting its tests in a specialized laboratory in accordance with strict procedures and in the volumes specified in the standard.

Visual inspection and measurement of dimensions

Visually, you can check the number and color of veins, the number of wires in the vein, the integrity of the shell and insulation, the ease of their separation.

With the help of measuring tools, you can check the thickness of the shell and insulation. Measuring the diameter of the wire and calculating the cross-section of the wires by a special formula does not apply to a strict method of control, since the correspondence of the section confirms the electrical resistance. But nevertheless, a significant deviation (more than 10%) of the calculated cross section from the nominal cross section may become the basis for doubt in quality.

The winding test after keeping at a low temperature

In this way, when you have a large freezer with a temperature of -15 ° C, the quality of the cable sheath is checked, the outer diameter of which is up to 20 mm. For this purpose, the length of the cable, folded for compactness into a ring (length approximately 1.2 m), is placed for 45 minutes in the freezer, then it is taken out and for 5 minutes the winding is carried out on the drum with a full turn. The diameter of the drum should be 15 ∙ (Dn + d) ± 5%, where Dn is the outer diameter of the cable VVGng-LS in mm, d is the diameter of the core in mm. In this case, a qualitative shell should not have cracks and breaks.