Calculation of the cable cross-section by power and length

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Contents

    • 0.1 Table for the selection of the wire cross-section depending on the power( W)
  • 1 How to do self-calculation of the cable cross-section along the length?
  • 2 Program for calculating the cable cross-section by power
  • 3 Advice from professionals

Find out the cable cross-sections by power and length of the wire. We use an efficient online wire diameter calculator. Cables are the main elements in the process of transmission and distribution of current. They play an important role in the connection of electricity, which is why it is necessary to accurately and qualitatively calculate the cable cross-section along the length and power of the load in order to create favorable conditions for the uninterrupted passage of electricity and avoid negative emergency consequences.

If the wrong diameter of the wiring is chosen for the design and development of the electrical network, then overheating and failure of various electrical appliances are possible. And also the insulation of the cable will be broken, which will lead to a short circuit and a fire. There will be significant costs to restore not only electrical wiring, but also all electrical appliances in the room. To avoid this, you need to competently make the choice of the cable cross-section in terms of power and length.

Online power calculator for power selection

Enter power: kW
Select the rated voltage: 220 B380 B660 B6 kB10 kB
Indicate the number of phases: 13
Choose the material of the wires: Aluminum( Al) Copper( Cu)
Enter the length of the cable line: m
Specify line type: Not definable 1 kB6 kB10 kB
Rated cross-section of conductor mm2:
Recommended cross-section mm2:

On our site you can easily make the necessary calculation of the diameter of the wiring for a few secondsusing a ready-made program to obtain data on the cross-section of the cable core.
To do this, you need to enter several individual parameters into the ready table:

  • capacity of the proposed object( total load indicators of all used electrical appliances);
  • choose the nominal voltage( most often single-phase, 220V, but also three-phase - 380V);
  • indicate the number of phases;
  • material veins( technical characteristics of the wire, give out two compounds - copper and aluminum);
  • length and line type.

Be sure to include all values. After that, click on the "Calculate" button and get the finished result.

This value ensures that when calculating the cable cross-section for power, the online wire will not overheat under the workload. Ultimately, it is important to take into account the voltage drop on the wires of the wire, choosing the parameters for a particular line.

Table for the selection of the section of the wire depending on the power( W)

Calculation of the cable cross-section by power and length

How to do self-calculation of the cable cross-section along the length?

In a domestic environment, such data is necessary when manufacturing extensions for a long distance. However, even with accurately obtained results, it is necessary to leave 10-15 cm in stock for wire switching and connection( by welding, soldering or crimping).

Instruments
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In industry, the formula for calculating the cross-section of the cable in terms of power and length is applied at the stage of network design. It is important to accurately determine such data if the cable will have additional and significant loads.

Example of calculation in everyday life: I = P / U · cosφ, where

I - current strength,( A);

P - power,( W);

U - voltage in the network,( V);

cosφ is the coefficient equal to 1.

Using this calculation formula, you can find the correct length of the wiring, and cable cross-sections can be obtained using an online calculator, or manually

Program for calculating the cable cross-section for power

To find out the power of the equipment or device, you need to look at the tag where they are indicatedMain characteristics. After adding up the data, for example, 20,000 W, it's 20 kW.This indicator indicates how much energy all electrical appliances consume. If their percentage ratio is used at one time about 80%, then the coefficient will be equal to 0.8.Calculation of the cable cross-section by power: 20 x 0.8 = 16 kW.This is the cross-section of the conductor for a 10 mm copper wire. For a three-phase circuit - 2.5 mm at a voltage of 380 V.

It is better to choose the wire of the largest cross-section in advance, in case of connection of unplanned equipment or devices. Better today to add money and do everything qualitatively than to change cable tomorrow and buy a new kettle.

Advice from

professionals The standard apartment wiring is designed for a maximum current consumption with a sustained load of 25 amperes( using a copper wire with a cross section of 5 mm and a diameter of 2.5 mm).The more the current consumption value is planned, the more the cable should live. If the wire is 2 mm in diameter, then its cross-section can be easily determined by the following formula: 2 mm × 2 mm × 0.785 = 3.14 mm2.If you round off the value, it turns out - 3 mm squared.

To make a choice of the power cable cross-section, you need to determine the total current of all electrical appliances yourself, add the resulting result and divide by 220.

The choice for cable routing depends on its shape, round wiring is better to be laid through walls, and for interior works, It is easy to install and does not create obstacles in operation. Their technical characteristics are the same.

Other useful online construction calculators for the calculation of materials and nagules.

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