Power cable VVGng with copper conductors is widely used for laying routes in wet and dry industrial premises. It is used for transporting and redistributing electrical power at rated voltage 660 In and 1000 IN.
Structurally, the cable can have two, three, four or five conductors, twisted together. The shape of the conductors can be round or sector. For two-core cables, the conductors have the same cross-section, and the cables are three-, four- and five-core construction can have cores, as the same section, and one of the conductors of a smaller cross-section, usually, this is a grounding conductor.
Free spaces between twisted insulated conductors are filled with PVC plastic compound, this filling is applied simultaneously with the PVC shell. When cutting the cable, the filling is separated from the cable sheath and the insulation of the current-carrying conductors without damage..
In a multi-core cable, individual cores have different colors, which facilitates installation work and cutting of cable ends. In addition to color marking, the use of digital marking is allowed.
The VVGng power cable is capable of operating without failures even in the event of a short circuit, duration 4 seconds, with overload, given that, if the maximum temperature does not exceed (+ 800 FROM), able to withstand alternating voltage up to 3,5 kV. The electrical resistance of the insulation of current-carrying conductors ranges from 7 Mom / km to 12 Mom / km.
When carrying out installation work on laying routes, it is allowed not to preheat the cable, if the ambient temperature has not dropped below (–150FROM). Limit radius of cable bending, in the process of laying routes, should not be less 15 diameters for single-core products, for stranded – 7,5 cross-sectional diameters.
Since the VVGng power cable is responsible for the coherence and safety of all technological processes, special requirements are placed on it, depending on its operating conditions, operating loads and environment. This takes into account, that cable products are operated at high voltage, must withstand high temperatures and ensure safety, should not serve as a source of fire or a source of smoke.
based on materials from the company website “MAKSPROM Group“
