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Calculation of the required cable cross-section

How to properly and accurately to make a cable cross section of the calculation of the loss of voltage? Very often in the design of power supply networks require competent calculating cable loss. The exact result is important to select the material with the required conductor cross-sectional area. If the cable is not properly, this will entail multiple material costs, because the system will quickly fail and cease to function. Thanks to sites assistants, where there is a ready-made program for the calculation of the cable cross section and the toll on him, it can be done easily and quickly.

How to use the calculator online?

The finished table, enter information according to the selected material of the cable, Power system load, voltage network, temperature of the cable and its method of lining. After you click "calculate" and get ready to result.
Such a calculation voltage line drop can be safely used in, if you do not take into account the resistance of the cable line under certain conditions:

  1. Pointing power factor cos phi equal to unity.
  2. DC line network.
  3. AC power with a frequency 50 Hz conductors with sections made up 25.0-95.0.

The results obtained must be used according to each individual case, taking into account all the errors of cables and wires.

Be sure to fill in all the values!

The length of the line (m) / cable material:

load power (W) or current (BUT):

Mains voltage (AT):

Power

1 phase

Power factor (cosφ):

current

3 phase

Allowable voltage loss (%):

cable temperature (°C):

cabling method:

cable cross-section of not less than (mm²)

current density (A / mm²)
resistance wire (ohm)

The voltage across the load (AT)
voltage loss (AT / %)

Calculation of the power loss in the cable under the school formula

Obtain the necessary data can be as follows:, using counting sequence indicators: ΔU=I·RL (loss of line voltage = current * resistance of the cable intake).

Why do I need to do the calculation of voltage loss in the cable?

Needless to energy dissipation in the cable may result in significant power losses, excessive heat and damage to the cable insulation. It is dangerous for people and animals. When a major length of the line is the impact on the cost of the light, which also adversely affect the material condition of the premises of the owner.

mochnost and conductor cross-section

In addition, the uncontrollable loss of voltage in the cable can cause failure of many appliances, as well as their complete destruction. Very often, tenants use cable cross-sections less than you need (to save), that soon causes a short circuit. A future costs of replacement or repair of wiring do not pay purses "thrifty" users. That is why it is so important to find the right section of the cables laid wires. Any wiring in residential domestoit initiated only after a careful calculation of losses in the cable. Important to remember, electricity - does not give a second chance, but because all you need to do initially correctly and accurately.

Ways to reduce the power loss in the cable

Losses can be reduced in several ways:

  • increase the cable cross-sectional area;
  • decrease in the length of material;
  • load drop.

Often, with the last two points is more difficult, and therefore it has to do it by increasing the cross sectional area of ​​core electrical cable. This will help reduce resistance. Such an embodiment has several costly moments. First of all, the cost of using such material is very palpable for many kilometers systems, and therefore it is necessary to choose the correct cable section, in order to reduce power loss in the cable threshold.

Online calculation of voltage loss allows to do it for a few seconds, with all the additional characteristics. For those, who wish to double-check the results manually, There physico-mathematical formula for calculating the voltage loss in the cable. certainly, it is the perfect companion for every designer of power grid.

Table for the calculation of the wire cross-section of power

cable cross-section, mm2

open wiring

Laying in the channels

copper

aluminum

copper

aluminum

current

Power, kW

current

Power, kW

current

Power, kW

current

Power, kW

BUT

220AT

380AT

BUT

220AT

380AT

BUT

220AT

380AT

BUT

220AT

380AT

0,5

11

2,4

0,75

15

3,3

1,0

17

3,7

6,4

14

3,0

5,3

1,5

23

5,0

8,7

15

3,3

5,7

2,0

26

5,7

9,8

21

4,6

7,9

19

4,1

7,2

14,0

3,0

5,3

2,5

30

6,6

11,0

24

5,2

9,1

21

4,6

7,9

16,0

3,5

6,0

4,0

41

9,0

15,0

32

7,0

12,0

27

5,9

10,0

21,0

4,6

7,9

6,0

50

11,0

19,0

39

8,5

14,0

34

7,4

12,0

26,0

5,7

9,8

10,0

80

17,0

30,0

60

13,0

22,0

50

11,0

19,0

38,0

8,3

14,0

16,0

100

22,0

38,0

75

16,0

28,0

80

17,0

30,0

55,0

12,0

20,0

25,0

140

30,0

53,0

105

23,0

39,0

100

22,0

38,0

65,0

14,0

24,0

35,0

170

37,0

64,0

130

28,0

49,0

135

29,0

51,0

75,0

16,0

28,0

Video on the correct choice of wire gauge and typical mistakes



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