To check, measure the diameter using any of the describ methods, then check the table. It states that with such a cross-section of four square millimeters, the wire size should be 2.26 mm. If your measurements are the same or very close (there is a measurement error, since the devices are not ideal), everything is fine, you can buy this cable.
The stat sizes do not always correspond to the actual ones.
But much more often the actual diameter of usa student data to work with a table the conductors is much smaller than the declar one. Then you have two options: look for a wire from another manufacturer or take a larger cross-section. Of course, you will have to overpay for it, but the first option will require a fairly long period of time, and it is not a fact that you will be able to find a cable that meets GOST.
The second option will require more money, since the where to find a sample and how to create one yourself depends significantly on the declar cross-section. Although, it is not a fact – a good cable made according to all standards can cost even more. This is understandable – the cost of copper, and often insulation, when observing the technology and standards – is much higher. That is why manufacturers philippines numbers cunning, rucing the diameter of the wires – to ruce the price. But such savings can turn into trouble. So be sure to take measurements before buying. Even from trust suppliers.
And one more thing: inspect and feel the insulation.
It should be thick, solid, and of the same thickness. If, in addition to the diameter change, there are also problems with the insulation, look for a cable from another manufacturer. In general, it is advisable to find products that meet the requirements of GOST, and not those made according to TU. In this case, there is hope that the cable or wire will serve for a long time and without problems. Today, this is not easy to do, but if you are wiring your home or connecting electricity from a pole, quality is very important. Therefore, it is probably worth looking.
How to determine the cross-section of a multi-core wire
Sometimes multi-core conductors are us – consisting of many identical thin wires. How to calculate the cross-section of the wire by How to work with a table in this case? Yes, exactly the same. Take measurements/calculations for one wire, count their number in a bundle, then multiply by this number. This is how you will find out the cross-sectional area of the multi-core wire.
The cross-section of a multi-core wire is calculat similarly
What is wire cross-section
About choosing the cross-section of the cable wire for electrical wiringStandard apartment electrical wiring is calculat for a maximum current consumption under a continuous load of 25 amperes (the circuit breaker at the entrance to the apartment is also install for this current) and is made of copper wire with a cross-section of 5 mm2, which corresponds to a wire diameter of 2.5 mm.
According to the requirements of the Electrical Installation Rules (EIR), the cross-section of the core for apartment electrical wiring must be at least 2.5 mm2, which corresponds to a conductor diameter of 1.8 mm.
What is wire cross-section
The more water you ne to supply, the larger the diameter of the pipe you ne, and for the current. The more current is consum, the larger the cross-section of the wire should be.
What is the cross-section of the wire? If you cut the wire and look at it from the end, you will see the core of the wire, here is the area of the end of this core, that is, the area of the circle is the cross-section of the wire. The larger the diameter of the circle, the larger the cross-section of the wire and, therefore, the wire is capable of heating up to the permissible temperature to transmit more current.
As can be seen from the formula, the wire cross-section (area of a circle) is easy to determine by its diameter. It is enough to multiply the diameter by itself and by 0.785.
Calculation example.
There is a wire with a diameter of 2 mm. Let’s determine its cross-section. 2 mm × 2 mm × 0.785 = 3.14 mm2. Such accuracy is not ne and we will round the value to an integer, the cross-section of a core with a diameter of 2 mm is 3 mm2. The diameter of the conductor can be determin using a caliper with an accuracy of 0.1 mm or a micrometer with an accuracy of 0.01 mm. If there are no devices at hand, then in this case an ordinary ruler will help out.