How much load can a 220 volt square copper wire withstand? How do you calculate it with a formula?

Copper wire load calculation formula.

The 240 square control wire has a permissible current that is several times the cross-sectional area, which is only 400A. If it is a power cable, double it again, and there is a collapse of 600A that can withstand the current.

For example, the calculation of the current carrying capacity of the aluminum core insulated wire when the ambient temperature is not more than 25:

When the cross-section is 6 square millimeters, the width of the digging shirt is calculated as the current carrying capacity of 30 amperes;

When the cross-section is 150 square millimeters, the calculated current carrying capacity is 300 amperes;

When the cross-section is 70 square millimeters, the calculated current carrying capacity is 175 amperes;

From the above arrangement, it can also be seen that the multiplier decreases with the increase of the cross-section, and at the junction of the multiplier transition, the error is slightly larger. For example, the cross-section 25 and 35 is the boundary between the quadruple and the triple, and 25 belongs to the quadruple range, which is calculated as 100 amperes according to the formula, but 97 amperes according to the manual; On the contrary, 35 is 105 amps according to the formula, but the table is 117 amps.

Expanded Judgment Highlight Materials:

1. Increase the core area to increase the current carrying capacity of the cable, and the core area (wire cross-sectional area) is positively correlated with the current carrying capacity, usually the safe current carrying capacity of copper wire is 5 8a mm2, aluminum wire is 3 5a mm2.

2. The use of high conductive materials to improve the current carrying capacity of the cable, such as the use of copper wire instead of aluminum wire, can increase the current carrying capacity by 30% under the same specifications. Silver wire is even used in some demanding occasions.

3. The use of high-temperature thermal conductivity of insulating materials to improve the current carrying capacity of cables, although the temperature resistance of insulating materials can reach more than 100, but usually considering the actual laying conditions and safety, the allowable use temperature will be reduced, which is different in various countries.

The copper wire with a cross-sectional area of 240 square millimeters and a permissible current density of only two amperes, can only carry 250 kilowatts of three-phase electrical appliances on the power supply of 380 Hutuan Fuwang Town. If you take a three-way trap to make a thick 70 square (the total cross-sectional area is 210 square meters), although it is only 210 square meters, it can drive nearly 350 kilowatts of three-phase electrical appliances.

How many kilowatts can a 240 square copper cable carry.

How many kilowatts can be carried by a 240 square copper bent base cable is uncertain, depending on the specific circuit situation. Generally speaking, if it is a 380V system, then a single-core 240 square millimeter copper cable can carry 269 kilowatts, and a three-core 240 square millimeter copper cable can carry 206 kilowatts. The maximum flow rate that can be carried by a single 240 square millimeter copper cable is 510A, while the maximum flow rate that can be carried by a three-core 240 square millimeter copper cable is 392A.

Answer: Find a practical hardware manual, the safe load current per square copper wire is 6A, according to the power sales rate formula: P=UI=220 (1 6)=1320W=, at 220V voltage, 1 square copper wire can be designed according to the kilowatt load.

Supplementary note: The rated current of the cable in the circuit is also related to the line frame (laying) mode, but the rated current change caused by the different line frame (laying) methods, the relative cable material, the wire diameter of the rated current change, the proportion is very small, and the shed line is often ignored. The influence of line distance on voltage (line voltage drop) is 500 meters, and the line distance should be kept within 500 meters to neutralize the noise, and the line voltage drop is negligible.

Hello dear, glad to answer this question, we need to know the diameter (or cross-sectional area) of the copper wire, because this will affect its resistance. In general, the design load should take into account macro factors such as the maximum current and temperature that the copper wire can withstand. In general, the design load can be calculated by the following formula:

p = i 2 * r where p is the power (in watts), i is the current (in amps), and r is the resistance (in ohms). Assuming that the diameter of the copper wire is 1 mm, its cross-sectional area is about the square millimeter of the bond. According to the standard**, it can be concluded that the resistance of a pure copper conductor with a cross-sectional area of 1 square millimeter is approximately equal to ohms m at 20.

If a 220V AC voltage is added to this pure copper conductor of unlimited length, the maximum allowable rated current through this conductor in 20 cases can be calculated using the following formula: i = sqrt(p r) Assuming you want you to withstand a load of 100W, then i = sqrt(100 For example, using a 1 square millimeter section through a 220 volt AC system under this requirement**The red quartz emitter requirement exceeds 18 amps**The maximum temperature specified in the specification is less than 80, However, due to the large temperature rise during use, it is necessary to ensure that the current rating of the selected cable meets the actual requirements. If you are unsure about the design load values or the specific parameters of the copper wire you need, consult a professional for a more accurate answer.

National standard (copper wire).

Current: wire diameter (mm²).

6a and below:1

6~12a：

12~20a：

20a: Wheel Burn 4

32a：640a：10

63a：16

80a：25

100a：35

125a：50

160a：70

200a：95

250a：120

380a：185

Above 250a: copper bar.

The 16 square copper wire can withstand 63A current (as for the power, it depends on the voltage used by the landlord.) Power = voltage and current).

If it is a household 220V, the tolerable power is 220 63 = 13860W

If it is a three-phase 380V, the principle of cable selection is [simple algorithm]:

For wires below 10mm2 (including 10mm2), multiply the cross-sectional area of the wire by 5 is the current carrying capacity of the cross-sectional wire.

The corresponding cross-sectional area of 100mm2 or more is multiplied by 2

16mm mm2 times 4

35mm mm2 times 3

70mm mm2 multiplied.

If the wire is multiplied by the coefficient and the total cross-sectional area of the wire does not exceed 40% of the pipe wax, the imaginary cross-sectional area is not 40%)

It is used in high-temperature places within the multiplication coefficient of Celsius).

The cross-sectional area of bare wire (such as overhead bare wire) is multiplied by the corresponding magnification and then multiplied by 2 (e.g., 16mm2 wire: 16*4*2).

The above is calculated based on the cross-sectional area of the aluminum wire.

Copper wire upgrade calculation means that the current carrying capacity of copper wire is equal to the current carrying capacity of aluminum wire, and so on.