It is known that the square of the motor KW is calculated as 13KW

It is basically 2 times. 26 A. The calculation margin should be 6 square meters.

Calculate the current, w u = ii = 34a, you can use 10 square lines.

Current = Power Voltage 3 Power Factor Efficiency General Motor Power Factor COS is taken.

Generally, the efficiency of the motor is 95%.

Current = 11000 380 08 22A

The rated current of the motor is about 22A with 6 square copper cables.

There is a formula for this, but the calculation is quite complicated, commonly used empirical formulas to judge, the current of the 11kw motor is between 21-22A, check the safe current carrying capacity of the national standard copper core wire, square mm can be, but considering that there are too many fake and shoddy products on the market and the safety of mechanical strength, it is wise and necessary to use a line of 4 square mm, but if there is a condition, it is necessary to use 6 square mm and above.

Its calculated current i=p 3ucos =

Select the conductor to estimate the line cross-section according to the load distance s=m 5*50=11*300 250=

If the distance is 300 meters away from the power supply, 16mm2 aluminum core plastic wire can be selected. The voltage drop of u% is approximately sufficient.

According to the conditions, the current is equal to the power divided by the voltage multiplied by the power factor, and 10 square copper wires should be selected.

Power = Voltage Current Power Factor (Power Factor COS Take Current = 11 000 (380 A (approximately) Considering that the starting current of the device is slightly larger.

It is recommended to choose a 6 square millimeter copper core cable or a 10 square millimeter aluminum core cable.

The calculation method is very good, I think the choice of wire diameter is divided into direct start and frequency conversion start, direct start is best with 10 square copper wire, frequency conversion start 6 square on it.

The motor is 15kw with 6 square copper cable and 50A switch. First determine the conditions, the voltage is 380V, the power factor, the three-phase power supply, and the power supply distance is short (ignoring the voltage drop problem).

According to the power formula p = yes. i=p/(

27A (calculated according to the three-phase mains, the power factor is taken.)

Choose the copper core wire, check the table, the current carrying capacity of 4 square millimeters of wire is 20a, the current carrying capacity of 6 square millimeters is 32a, the current carrying capacity of the wire is greater than the rated current of the motor, so choose 6 square millimeters of wire.

The motor is 15kw with 4 square copper cable and 50A switch.

According to the power formula p=have:i=p (

27A (calculated according to the three-phase mains, the power factor is taken.)

Check the cable ampacity meter above, choose a square copper wire is reluctant, and it is best to choose a 4 square cable. If the distance is far, 6 square copper wire can be selected. The specification of three-phase air opening is (RMM1-100S h):

Therefore, 50A air opening is optional.

Usually the design institute will give you 3*16 cables, which have a higher safety factor. For general self-use, it is recommended to consider a 3*10 cable. The safety factor is guaranteed.

Is 15kw motor 500 meters wire length, 10 square wires enough? That's how the old electrician calculated.

First calculate the current of a 12 kW motor, according to the formula:

Three-phase: P u is the line voltage, a certain phase current.

When the motor voltage is 380 volts, it can be calculated by the following formula:

Motor power = root number 3 * current *

Substituting 12 kilowatts into the above equation, we can get that the current is equal to the ampere.

So just use a square copper wire.

Copper wire and current relationship:

The safe current carrying capacity of the square millimeter is 28A

The safe current carrying capacity of 4 square millimeters is 35A

The safe current carrying capacity of 6 square millimeters is 48A

The safe current carrying capacity of 10 square millimeters is 65A

The safe current carrying capacity of 16 square millimeters is 91A

The safe current carrying capacity of 25 square millimeters is 120A

The current is less than 28A, the current is greater than 120A, and the value of 5A per square millimeter of wire diameter is calculated according to the multiple of the copper wire.

Calculate the operating current p= first

i=, the main power supply of the three-phase motor consists of a three-core phase wire and a ground wire.

If you use the formula, s= li u, so if you want to use the formula, you also need to provide the length of the line, where is the resistivity of copper (if it is an aluminum wire, it will be replaced by the resistivity of aluminum).

In view of this, RVV cables are recommended according to the current carrying capacity comparison table of the empirical cables.

, so small? 1 square whatever you want.

Upstairs for the 12kw motor wire, you might as well try it yourself.

1. First according to the active power (kw) and rated voltage of the motor.

v), power factor.

cos) to find the rated current.

2. According to the working environment of the motor, such as ship or land, overhead or buried, fixed or mobile laying, ordinary or flame retardant and fire retardant, etc., select the structure and model of the cable;

3. Check the current carrying capacity parameters of the selected type of cable, and find out the corresponding cable cross-sectional area greater than the rated current of the motor.

These are the three most important steps in choosing a cable.

If the cable is very long, it is necessary to calculate whether the voltage drop meets the national standard, otherwise it is necessary to re-select the cross-sectional area of the larger gear for verification.

Friend, in this way, a load of 380V is about two amperes, a 660V motor is about one kilowatt, and a 690V motor is about 1000A for a megawatt.

As for the cable calculation, the smaller the wire diameter, the better the heat dissipation effect, so the corresponding cable current carrying capacity will also increase, but in fact, when used in engineering, we generally calculate according to one square according to 2a, which is already the limit value, of course, into the previous mention, the current carrying capacity of the small wire is very large, the maximum of 1 square can reach 5 to 7a, but the time is relatively short. So you can press the square 2a, in order to be safe, it is recommended to press, so that even if you work for a long time with a large current, there is no problem. In addition, if you are using copper bars, it is recommended to enlarge the point.

As you said, if you only know the power of the motor, you can't calculate the actual current of the motor at all, because the current of the motor is related to the working voltage of the motor, and it is also related to the power factor and efficiency.

Power = root number 3 multiplied by voltage multiplied by current multiplied by power factor multiplied by efficiency.

Very unit, don't memorize formulas. Convert kW to current, aluminum wire 1 square**, copper wire below the square of 2 or 3, 100 square or more of the cable or 2A. For example:

100kw, 380V motor, current about 200A, aluminum wire 95 square meters, copper wire 70

There is no formula, experience 1 kW 2A current (3 items 380 volts), according to the current value and then go to the cable ampacity meter to find.

Cables that meet the requirements.

I want to ask the master on the safe current carrying capacity of the copper wire is 2--3A or 2A???

Agree with the statement upstairs, individuals can use 4 square meters, and companies still use 6 square meters, leaving a margin, and also consider reducing the capacity of the overheating of the string.

380V, three-phase motor 11kW, working current: I=11 (

Copper wire area: 10 square millimeters.

The formula refers to the upstairs.

It is recommended to use 6 square for 2-pole motors and 4 square for more than 4 poles.

Generally, the safe ampacity of copper conductor is determined according to the allowable maximum temperature of the core, cooling conditions and laying conditions. Generally, the safe ampacity of copper wire is 5 8a mm2, and the safe current carrying capacity of aluminum wire is 3 5a mm2. Such as:

Recommended value of safe ampacity of 4 mm2 bvv copper wire Recommended value of safe current carrying capacity of 4 mm2 bvv copper wire 4 8A mm2=32a Calculate the cross-sectional area of copper wire Using the recommended value of safe ampacity of copper wire 5 8A mm2, the upper and lower ranges of the selected copper conductor cross-sectional area s are calculated: s=< i (5 8)>= i i(mm2) s--- copper conductor cross-sectional area (mm2) i--- load current (a).

The rated current of the 60kw motor is 120A, calculated according to 5 times the safe current carrying capacity, the calculation result is 20 square meters, and there are 25 square power cords on the market, which can be selected.