What is the resistivity of 700m copper wire? What is the resistivity of 700 meters copper wire? How much current can 10 square copper wire bear at most? What is the maximum current that a 700 meter copper wire can pass?

What is the resistivity of 700m copper wire? What is the resistivity of 700 meters copper wire? How much current can 10 square copper wire bear at most? What is the maximum current that a 700 meter copper wire can pass?

Resistance is related to length and resistivity. Resistivity is related to cross-sectional area and material. You don't give the cross-sectional area, so you don't know the resistivity. Generally, you can calculate the copper wire by 6-8a per square meter. Of course, this is a short distance. If the wire is pulled far away, the voltage drop will be too large~
Is one degree of electricity equal to one thousand watts
A thousand watt hour is equal to one kilowatt hour
One kilowatt hour of load is 1000 hours
The total power is 120kw. How many square mm cables and how many a air switches are needed for the incoming line?
It depends on the load of 120kw, the switch and cable for the load. If the load is general or light, it can be small. This is the principle. It also depends on the power of the largest load. But what I give you is that the switch is 400A, the current setting value is 315A (you can choose 400A. The current setting value is 250A), and the cable is 3 * 120m2. I don't know if you use it underground, For underground cables, there is no need to add 1-core or 2-core wires, such as 3 * 120 + 2 * 70
Secondly, we must use copper core cable, which is used on the surface
What is the resistivity of aluminum wire and copper wire
The resistivity of copper wire is 0.0172 and that of aluminum wire is 0.0283
The power consumption of the freezer is 1.1kw.h/24h, and how many kilowatts of electricity can be used in a day
It usually gives power, energy consumption per hour
One hour is 1.1KW. If 24 hours are used in a day, it is 26.4KW. H,
And 1 kW. H at 1 degree
So it's 26.4 degrees
What size of three-phase four wire aluminum cable should be used for 150 kW power? What size of air switch should be equipped
You can roughly estimate that 150KW, mainly for motors, the current is about 300A. For other electrical appliances, you can use the calculation method above to calculate the current. I think you are the bus and master switch, and you have to leave a margin. The air switch needs at least 450A
Calculation formula of copper wire resistance
The resistance of the cable is 3 ohm, the conductivity of the copper wire is 0.0172, and the diameter of the copper wire is 0.4mm. What is the length of the cable? What is the calculation formula?
3 Ω = 0.0172 * cable length / cable section 0.4
Length = 0.043
Length = 3 / 0.043
=69.77M
Formula: r = ρ L / S
Where ρ is the conductivity, l is the length of the conductor and S is the cross-sectional area of the conductor.
So l = RS / ρ = 3 * (3.1416 * 0.0002 * 0.0002) / 0.0172 = 0.00002m = 0.02mm
The power consumption of Rongsheng refrigerator bcd-158e (kWh / 24h) is 0.48. What is the rated power of this refrigerator,
In other words, this refrigerator is actually how many watts, in the voltage is low to how many volts compressor can not run up!
The power consumption has nothing to do with the rated power, because the refrigerator is on and off in the process of operation. The rated power of a refrigerator is determined after the compressor is selected, and the power consumption is related to the opening times of the refrigerator, the amount of food and the ambient temperature
The total power of 3-phase + 1 is 32 kW. Ask how many a air switches and copper cables you need, and then give me a formula
Distance within 50 meters. Open line shop
90a air switch,
Current estimation formula:
Multiply it by nine at 2.5 and go up minus one
Multiply 35 by 3.5, double double group minus 0.5
Conditions are variable plus conversion, high temperature 10 fold copper upgrade
The number of pipes is 234, 876
explain:
(1) The formula in this section does not directly point out the current carrying capacity (safety current) of various insulated wires (rubber and plastic insulated wires), but "cross section multiplied by a certain multiple", which is obtained by mental calculation. It can be seen from table 53 that the multiple decreases with the increase of cross section
"2.5 mm, multiply by 9, subtract one from the top" means that the current carrying capacity of aluminum core insulated wires with various cross sections of 2.5 mm 'and below is about 9 times of the number of cross sections. For example, the current carrying capacity of 2.5 mm' conductor is 2.5 × 9 = 22.5 (a). The multiple relationship between the current carrying capacity and the number of cross sections of 4 mm 'and above is arranged along the line number, and the multiple is successively reduced by 1, that is 4 × 8, 6 × 7, 10 × 6, 16 × 5, 25 × 4
In other words, the relationship between the section of two conductors and the section of two conductors becomes 355.3 mm, That is to say, the current carrying capacity of 50 and 70mm 'conductor is 3 times of the number of cross-sections; the current carrying capacity of 95 and 120mm' conductor is 2.5 times of the number of cross-sections, and so on
If the aluminum core insulated wire is exposed in the area where the ambient temperature is higher than 25 ℃ for a long time, the current carrying capacity of the wire can be calculated according to the above formula, and then 10% off. When the aluminum core insulated wire is not used, but the copper core insulated wire is used, Its current carrying capacity is slightly larger than that of aluminum wire of the same specification. According to the above formula, the current carrying capacity of one wire number larger than that of aluminum wire can be calculated. For example, the current carrying capacity of 16mm 'copper wire can be calculated as 25mm2 aluminum wire
What is resistivity? What is the formula?
1) Definition or explanation resistivity is the physical quantity used to express the resistance characteristics of various materials. The resistance of a conductor made of a certain material with a length of 1 meter and a cross-sectional area of 1 square millimeter is called the resistivity of this material. (2) in the international system of units, the unit of resistivity is Ohm · m, and the commonly used unit is Ohm · square millimeter / m