How thick wire is used for mining machine

1.

Do you talk about the size of insulated conctor for 12000 watts? The difference between single-phase power supply and three-phase four wire power supply is obvious. Select according to the calculation below

For single-phase power supply:

1. calculation of single-phase power supply current: IJs = P / U / cos φ= 12000/220/0.85≈64.2A
   

2. the conctor is selected according to the safe cut-off flow of the conctor. Considering the influence of environmental factors and laying methods, a 20% margin is left, i.e. 64.2 × 1+20％≈77A

3. there is no need to consider the line voltage drop factor, so 16mm & # 178 is selected; Copper core PVC insulated wire or 25 mm × 178; The safe cut-off capacity of PVC insulated wire with aluminum core is 105a and 105a respectively. For example: bv-3 × 16 or blv-3 × 25

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when two or three-phase power supply:

1. calculation of three-phase power supply current: IJs = P / U / √ 3 / cos φ= 12000/380/1.732/0.85≈21.5A

2. the conctor is selected according to the safe cut-off flow of the conctor, and the influence of environmental factors and laying methods is considered, with a margin of 20%, i.e. 21.5% × 1+20％≈25.7A

3. there is no need to consider the line voltage drop factor, so 4mm & # 178 is selected; Copper core PVC insulated wire or 6mm × 178; The safety cut-off of PVC insulated wire with aluminum core is 42a and 42a respectively. For example: bv-5 × 4 or blv-5 × 6

   According to article 5.0.15 of code for design of power supply and distribution system (GB 50052-2009), when the line current of 220 V load is greater than 60 A, 220 / 380 V three-phase five wire system should be used for power supply. The current of 72kw is more than 60A, so the three-phase five wire power supply mode should be adopted

2. 1 Lighting wires at home

use 1.5 square meters. Generally, the household lighting load power will not be too large. There are almost 6-8 lights in the dining room, living room, main and secondary bedrooms, balcony, kitchen and toilet, which are controlled within 1500 watts. 1.5 square meters of national standard copper wire is enough

[2] the water heater socket cable

is relatively large in household appliances. It is recommended to use 4 square wires. The maximum allowable load of 4 square copper core wires is 7000-8000 watts, and the limit value is 8000 watts. Therefore, even if the water heater or Yuba is turned on at the same time, there will be no big problem. Even if it is overloaded, it will only trip

[3] the wires of the air conditioner socket

the air conditioner is also a high-power electrical appliance in the home, so the socket also uses 4 square wires, of course, it can also use 6 square wires, but the construction difficulty will increase, the area occupied by the bottom box of the socket will become larger, and the wiring will become a very troublesome thing

[4] the wires of ordinary socket

the ordinary socket at home can use 2.5 square wires, and the general load is controlled within 2500 watts. But if you often use high-power electrical appliances, it is recommended that you choose 4 square wires

[5] it is recommended to use 4 square wires for kitchen sockets, on the one hand, because there are many appliances in the kitchen, on the other hand, because of the high frequency of use. Some kitchen is a square line to go to the top, and then arrange the socket below, with 2.5 square line fire, all sockets are connected from the square line alone, therefore, this practice is no problem.

3. The main power line of home circuit can meet the above requirements with 6 square wires, 4 square wires for 3000 Watt motor, 2.5 square wires for inction cooker, rice cooker, water dispenser, washing machine and 1.5 square wires for lighting
refrigerator power is measured in 24 hours. According to the power you said, the full load current is about 40 A, so it is recommended to use 10 square meters for the main power line. As it is not possible for all the electrical appliances to work, it is not necessary to use 6 square meters. Lighting 2.5 is enough. If the socket is divided into several circuits and the high-power electrical appliances are divided into several circuits, 2.5 is enough. Considering the increase of electrical appliances in the future, we can also use 4 square meters for the socket
4 square copper core wires can be selected for bus, and 2.5 square copper core wires are enough for branch wires
6 square copper core wires should be used for incoming wires, 4 square copper core wires should be used for branch wires, and 2.5 square copper core wires should be used for socket wires< At least 6 square wires should be used.
6 square copper core wires should be used for incoming wires and 4 square copper core wires should be used for branch wires,. That's enough

4.

According to the formula calculation, the formula of safe current carrying capacity of electrical wires and aluminum cables is as follows:

2.5 times 9, up minus 1. 35 times 3.5, double group minus 0.5. There are conditions for conversion, high temperature 10% copper upgrade. The number of tubes is 234, 876

The first sentence of the formula means that the current carrying capacity of aluminum core insulated wires with various cross sections of 2.5 square meters or less is 9 times of the number of cross sections. Such as 2.5 square conctor, the current carrying capacity is 2.5 × 9=22.5(A) The multiple relationship between the current carrying capacity and the number of cross-sections of conctors with a square area of 4 or more is arranged upward along the line number, and the multiple is successively reced by 1, i.e. 4 × 8、6 × 7、10 × 6、16 × 5、25 × 4

The second sentence of the pithy formula means: the current carrying capacity of 35 square conctor is 3.5 times of the number of cross sections, that is 35 × 3.5=122．5(A) From the multiple relationship between the current carrying capacity and the number of cross-sections of the conctor with an area of 50 square meters or more, the current carrying capacity of the conctor with an area of 50 square meters and 70 square meters is 3 times of the number of cross-sections, and the current carrying capacity of the conctor with an area of 95 square meters and 120 square meters is 2.5 times of the number of cross-sections

The third sentence of the pithy formula means: the applicable conditions of the pithy formula are "aluminum core insulated wire, single open laying, ambient temperature 25 ℃". 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 copper core insulated wire is used instead of aluminum wire, 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 16 square copper wire can be calculated according to the current carrying capacity of 25 square aluminum wire

In the case of laying two, three or four wires through pipes, the current carrying capacity is calculated as 80%, 70% and 60% of the current carrying capacity (single wire laying) in the formula

extended data

if you want to judge the thickness (square) of the wire, you can use a vernier to measure the diameter of the wire, and then calculate the cross section

section formula: S = square r of radius ×π R is the radius of the wire)

for example, a wire with a diameter of 1.76 is 1.76 ÷ two × 3.14 = 2.76 square ≈ 2.5 square (approximate)

if you want to choose the size of the wire, you should first calculate the current according to the power of the electrical appliance, and then check the electrician manual according to the current, which is more accurate

if it is a single core, its diameter can be measured, and then the radius can be obtained

according to the formula of area s = radius * radius * 3.14

the cross-sectional area of the wire can be known, and some wires are twisted together by multiple cores, so it can't be calculated by single core method, but can only be calculated by connecting single core wire according to one of multiple wires in the wire, Then multiply it by the number of shares in the line

The formula is s = radius * radius * 3.14 * n, where n is the number of twisted wires

5. Unknown_Error

6. Wire selection is generally based on the current to choose, and then take some peripheral conditions into account, it can be! The current of 32A is 6mm and 178; As for the 8400w air conditioner, it depends on the power consumption or the cooling (heating) power, and then the 220 V or 380 v.

7. Now the work of the electrical instry will contact with electricity every day, and the wire as a carrier is the most important, in order to ensure the safety of electricity, the choice of wire is particularly important

for example, if 10A current needs to be connected, how large cable or wire should be selected as the conctor? Let's learn about it today

What thickness of wire should be used for 10A current

first of all, in order to ensure safety, the wire needs to meet the requirements of safe current carrying when passing 10A current. The heat generated by the wire is just equal to the heat generated by the current passing through the wire, and the temperature of the wire will not rise any more. At this time, the current value is the safe ampacity of the wire

as the conctor thickens, the current carrying capacity per square meter will graally decrease, and the heat and temperature generated by the conctor will also decrease. If the conctor is too large, it will waste the conctor resources, while if the conctor is too small, it may fuse e to excessive temperature and heat. Therefore, the most suitable conctor should be selected according to the actual current

in fact, before us, a large number of experiments have measured the data of matching different wires according to the current. These data are also included in the national standard manual. Due to the different types of wires, the corresponding national standard manuals are also different. You can find out according to the cable safety manual of GB t12706-2016. The wire needed for 10A current is 1.5 square millimeter

how thick wire should be used for 10A current

in some special cases, such as when the current is only approximate value, we should select the larger wire as far as possible, and according to the wire length, the selection will also be changed according to the actual situation.

8.

Suppose it's 220 V, 50 Hz AC, power is 5000 watts, with a copper conctor with a cross-sectional area of 2.5 square mm

(if you are more conservative, increase some surplus, select 4mm2 copper conctor)

the calculation method is as follows:

according to the power calculation formula: P = UI

I = P ÷ U=5000 ÷ 220 = 22.727 (a)

according to the comparison of conctor current carrying capacity:

1.5 square copper core wire allowable long-term load current is: 12a-15a

2.5 square copper core wire allowable long-term load current is: 16a-25a

4 square copper core wire allowable long-term load current is: 25a-32a

select the copper conctor whose cross-sectional area is 2.5 square mm

extended data:

first, calculate the current intensity according to the power and voltage, and then select the conctor according to the current carrying capacity table of the conctor. It can be considered that the cross-sectional area of the conctor is slightly larger, so there is surplus. If there is a small increase in the future load, the cross-sectional area of the conctor is enough

in power engineering, the current carrying capacity of conctor is determined by three factors: conctor material, conctor cross-sectional area (unit: square millimeter) and conctor laying conditions

Generally speaking, the current carrying capacity of single conctor is higher than that of multiple parallel conctors; The conctor laid in open line can have higher current carrying capacity than that laid in pipe; Copper conctor can take higher current carrying capacity than aluminum conctor. The current carrying capacity of conctor shall comply with iec-60364-5-523-1983 standard

The allowable long-term load current of the square copper core is 8A-12A

1.5the allowable long-term load current of the square copper core is 12a-15a

2.5the allowable long-term load current of the square copper core is 16a-25a

4The allowable long-term load current of the square copper core is 25a-32a

6The square copper core The allowable long-term load current of the line is: 32a-40a

note: the above "square" refers to "square millimeter"

9. It depends on what kind of electrical appliances you connect, how much power the appliances have, how to use them, how to wire them, and the environment. If you don't need to be very strict, I think you just need to consider the power. With power in the calculation of current, look up the table to select the wire

in the current situation, 60x25 / 220 = 6.8a, 0.4mm2 wire should be enough. If the power factor is included, you can choose larger wires, such as 0.5, 0.75, and so on. The rated current of single core with the same cross-section will be higher than that of multi-core

10.

If the household voltage is 220 V, the current of 500 W electrical appliances is about 2.3 A, and the current is not big. Generally, 1.6 mm single wire or 2.5 square wire is more than enough

The determination of current density is based on the safe current of 1 square millimeter conctor working stably for a long time. The international unit is: A / M & # 178;, For the convenience of calculation, this unit is often converted into: A / mm & # 178

this is the key to determine the cross-sectional area of the conctor, which is generally conservative to ensure stable operation, with small voltage loss, all heat can be dissipated, and the stability of the conctor can not be relatively high

The direction vector is the normal vector of the corresponding cross section of the unit area, and the direction is determined by the direction of the positive charge passing through the cross section

In order to describe the current situation of each point, it is necessary to introce a vector field current density J, that is area current density

extended data:

wire selection criteria:

1. Copper core wire: wire, first of all, good conctivity. There are copper wires and other wires on the market. Copper wire is one of the most practical indoor decoration. However, copper wire can be divided into several types, including large radius copper wire and multi wire copper wire

2. Wires with strong load capacity: when the power consumption in the family is large or small, we will turn on the TV, air conditioner, computer, light, water dispenser, refrigerator, hair dryer, etc. If the load capacity of the wire is not strong, coupled with the hot summer, it is easy to make the wire burn because of high temperature, leading to fire

3. Good waterproof performance. Some wires are easy to deform and crack. In case of water leakage somewhere, it will lead to electrical burning, short circuit and even fire and casualties. So we must have a hard skin and good waterproof wire

The main line must be thick core. The so-called main line refers to the two main wires between the main power supply and all electrical appliances. The main line must use thick copper core wire, because the main line is loaded with the amount of electric charge of various electrical appliances, so it needs thick copper wire with excellent performance. The bypass can select multi-core wire

source of reference: network wire

source of reference: network current density