Conductor cross-section in accordance with GOST
Nominal cable cross-section is part of the core through which current flows. The cross section is determined by the circular formula, if the cut through the vein is rounded and has one wire in it. If there are a lot of delays at the cut, then to determine it is necessary to summarize the cross sections of all the wires in this cable.
In addition to these measurements and tables, which are often used when selecting a cable, it is worth considering and lowering such coefficients:
- is equal to the wire cross section and the position in the block;
- on the ambient temperature;
- for cable intended for instillation in the ground;
- on the number of working cables working near.
Wire cross-section calculation
Calculation should be done to ensure that the cable is selected, that it meets all the requirements of safety, reliability and durability. For a better understanding of the calculation options for slices, let's take an example of calculation for aluminum - 2,5 mm² in accordance with GOST 22483-77 1 class of bendability.
The cross-sectional area of the conductor is 2.5 mm²( S), the resistance in accordance with GOST for length( L) is 1 km at 20 ° C Rr = 12.1 ohms, the remote resistance of aluminum is p = 0.027 * 10 - 6, Ohm ∙ m. The cores, for each type of cable, are made of different materials. Here are the most common of them:
- Aluminum( GOST 13843-78, TU 16.705-144-80, GOST 6132-79);
- Copper( TU 16.K71-003-87, GOST 2112-79, 16.705-144-80).
Cross section of the company "Alur"
An example of a quality cable section manufacture, according to consumers' reviews, you can take LLC "Cable plant ALYUR".
Here are some examples of feedback: "And yet, not for advertising, I liked the ALLURE wire and the section can withstand thick insulation", "I try to use only VVGng cable( meeting the requirements of GOST R 53315-2009) produced by ALYR for mounting,distinguish such positive characteristics as: large cross-sections, insulation PVC, vein copper, aluminum. But there are also shortcomings.
Here, in comparison with the factory, "Magna" froze veins showed a "Magna" minus 28%, in "Alur" minus 6.8% the result of measuring the section. LLC "Cable factory ALYUR" has a certificate of fire safety, to confirm the quality of the cable.
