Calculation of the required cable section

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Contents

  • 1 How to use the calculator online?
  • 2 Calculating the power loss in the cable according to the school formula
  • 3 Why do you need to calculate the voltage drop in the cable?
  • 4 Ways of reducing power losses in the
    • cable 4.1 Calculator translating the values ​​of watts into amps
  • 5 Video for the correct selection of the wire cross section and typical errors

How correctly and accurately do the calculation of the cable cross section by loss of voltage? Very often in the design of power supply networks, a correct calculation of losses in the cable is required. The exact result is important for choosing a material with the required cross-sectional area of ​​the core. If the cable is not selected correctly, this will entail multiple material costs, because the system will quickly fail and cease to function. Thanks to the sites of assistants, where there is already a ready-made program for calculating the cable section and loss on it, it can be done easily and quickly.

How to use the calculator online?

In the finished table, you need to enter data according to the selected cable material, system load power, network voltage, cable temperature and the way it is laid. After clicking the "calculate" button and get the finished result.
This calculation of line voltage losses can be applied safely in operation if the resistance of the cable line is not taken into account under certain conditions:

  • Specifying the power factor of cosine phi is equal to one.
  • Lines of the DC network.
  • AC network with a frequency of 50 Hz made with conductors with sections up to 25.0-95.0.

The obtained results must be used according to each individual case, taking into account all the errors of cable-conductor products.

Be sure to fill in all the values!

Line length( m) / Cable material:

CopperAluminium

Load power( W) or current( A):
Line voltage( V):

Power

1 phase

Power factor( cosφ):

Current

3 phases

Validvoltage loss( %):
Cable temperature( ° C):
Cable laying method:

Open wiring Two single-core pipes in pipe Three single-core pipes in pipeTwo single-core pipes in a pipeOther three-core in a pipeGre.gasket in the boxes, 1-4 cablesGr.gasket in boxes, 5-6 cablesGr.gasket in the boxes, 7-9 cablesGr.gasket in the boxes, 10-11 cablesGr.gasket in the boxes, 12-14 cablesGr.(A / mm²)

Wire resistance( ohm)
Load voltage( V)
Voltage losses( V /%)

Calculation of the power loss in the cable according to the school formula

You can obtain the desired data in the following way, using for calculation the following combination of parameters: ΔU = I * RL( line voltage loss = current consumption * cable resistance).

Why do you need to calculate the voltage loss in the cable?

Excessive energy dissipation in the cable can lead to significant power losses, strong heating of the cable and damage to the insulation. This is dangerous for people and animals. With a significant length of the line, this will affect the costs for light, which also adversely affect the material condition of the owner of the premises.

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In addition, uncontrolled voltage losses in the cable can lead to the failure of many electrical appliances, as well as their complete destruction. Very often tenants use cable cross-sections less than necessary( for the purpose of economy), which soon causes a short circuit. And the future costs of replacing or repairing wiring do not pay off the wallets of "economical" users. That is why it is so important to select the correct cross-section of cables for the wires to be laid. Any electrical installation in a residential building should be started only after a careful calculation of the losses in the cable. It is important to remember, electricity - does not give a second chance, and therefore everything must be done correctly and qualitatively from the beginning.

Ways to reduce power losses in the

cable Losses can be reduced in several ways:

o increasing the cross-sectional area of ​​the cable;

o reducing the length of the material;

o load reduction.

Often the last two points are more difficult, and therefore have to do this by increasing the cross-sectional area of ​​the cable. This will help reduce resistance. This option has several costly points. Firstly, the cost of using such material for multi-kilometer systems is very noticeable, and therefore it is necessary to choose a cable of the correct cross-section in order to reduce the threshold of power loss in the cable.

Online calculation of voltage loss allows you to do this in a few seconds, taking into account all the additional characteristics. For those who wish to recheck the result manually, there is a physical and mathematical formula for calculating voltage losses in the cable. Of course, these are excellent helpers for each designer of electrical networks.

power and wire cross-section

Calculator translating the values ​​of watts into amps

[calculate id = 62]

Video for the correct selection of the wire cross section and typical errors

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