How many square meters of copper wire should be used for electrical equipment with a total power of

Generally, it is the current carrying capacity of the cable.

Multiply by voltage by power factor.

And, the cable is 180 meters long, the voltage drop can be easily estimated, and the voltage difference is = (power * resistance + reactive power * reactance.

Divide by voltage, power can be in accordance with 50kw, resistance and impedance.

According to the calculation of the cable parameters you choose, the voltage is followed, if the voltage difference is higher than 7%, it is not possible.

This is all a theoretical estimation method. Reactive power can be calculated according to the power factor or conversion.

Depending on the ambient temperature, the data used for different laying conditions is different, giving you a concise algorithm: the current carrying capacity of various wires can usually be found in the manual. However, with the use of formulas and some simple mental arithmetic, you can calculate it directly, without having to look up the table.

The mantra is: 10 under five; 100 on the second, fourth, third realms, two and a half times; Pipe-wearing, temperature, eight, nine-fold. Bare wires are added in half.

Copper wire upgrade counts. These formulas reflect the multiple relationship between the current carrying capacity of the aluminum core insulated wire and the cross-section.

According to the formula, the relationship between the nominal cross-section (square millimeter) and the multiple of the commonly used wires in China is arranged as follows:

Five, four, three, two, and a half, two.

For example, the current carrying capacity of the aluminum core insulated wire when the ambient temperature is not more than 25 is: when the cross-section is 6 square millimeters, the current carrying capacity is 30 A; With a cross-section of 150 square millimeters, the current carrying capacity is 300 amperes.

If it is laid through the pipe (including the laying of groove plates, etc., that is, the wire is covered with a protective sleeve layer, which is not exposed), after calculation, it will be discounted by 20%; If the ambient temperature exceeds 25, it will be discounted by 10% after calculation. For example, an aluminum-core insulated wire with a cross-section of 10 square millimeters has a current carrying capacity of 10 5 A under high temperature conditions.

In the case of bare wires, the current carrying capacity is increased by half. For example, a bare aluminum wire with a cross-section of 16 square millimeters has a current carrying capacity of 16 square millimeters at high temperatures

16 4 amps.

For the current carrying capacity of copper wires, the formula points out that "copper wire upgrade calculation", that is, the cross-section of copper wire is upgraded by one level according to the cross-sectional order, and then calculated according to the corresponding aluminum wire conditions. For example, the current carrying capacity of a bare copper wire with a cross-section of 35 square millimeters and an ambient temperature of 25 is: 50 3 ampere is obtained by upgrading to 50 square millimeters of bare aluminum wire.

For cables, it is not covered in the mantra. Generally, the high-voltage cable that is directly buried in the ground can be directly calculated by the relevant multiples in the first sentence. For example, the current carrying capacity of 35 square millimeters high-voltage armored aluminum core cable is 35 3 = 105 amperes.

How many square copper wires should be used for electrical equipment with a total power of 70 kilowatts If it is an inductive electrical appliance 70 kilowatts, the current is, check the electrician's manual 50 square copper core wire can meet the requirements, the interception of 50 square copper core wire is not long in meters, the power factor is time, 50 square copper wire, voltage loss is per kilometer, so it can be ignored.

The square copper core cable can band 148 kilowatts, and the 70 square aluminum cable can band 138 kilowatts. The safe current carrying capacity of 70 square copper and aluminum cables is 225A and 210A respectively, and the loads with three-phase 380V pure resistance are: P copper = 380 * 225 *, P aluminum = 380 * 210 *.

2. If the load is a motor, the power factor is calculated, then, p copper = 148086 *, p aluminum = 138214 *.

3. If the line is more than 100 meters, the length is L, 20, copper resistivity: 10% of the voltage drop is allowed, 30V is selected, and the line resistance R = current, therefore, the copper wire current = 30 * 70. According to 20, aluminum resistivity:

In the same way, the aluminum wire current = 30*70. The power carried is still calculated in accordance with Article 1.

70 square copper core wire, 380V combustible to bear the spine of kilowatts. It is obtained by the formula of the three-phase motor: p = so power p = kilowatts, cos is.

The voltage is 380V, check the cable manual YJV to know, the current of the 70 square copper core cable is 225A. The current carrying capacity of Pi Zixiang is 225A, which is within the normal range of power kilowatts.

A 70 square cable can carry 134 kilowatts, and a 70 square cable (copper wire) has a current carrying capacity of 241a.

According to the power formula, P = calculated according to the three-phase mains, and the power factor is taken.

The current carrying capacity of the wire is determined by three factors: the wire material and the cross-sectional area of the wire (per square millimeter, referred to as squared), and the wire laying conditions. Generally speaking, a single wire can have a higher current carrying capacity than multiple parallel wires; The open wire laying wire can take a higher current carrying capacity than the wire laid through the pipe; Copper conductors can have a higher ampacarrying capacity than aluminum conductors.

How many square copper wires should be used for electrical equipment with a total power of 70 kilowatts, and if the power consumption of 70 kilowatts is three-phase electricity, 380 voltage levels can be used with 35 square copper wires; If it is a single-phase voltage level of 220, 70 square copper wires should be used. The electricity consumption of 70 kilowatts, if it is a three-phase power 380 voltage level, its rated current is i=p (, the maximum rated current that 1 square copper wire can withstand is 6A, and the number of cables required is square = , so 25 square copper wires are used. (The nominal cross-section of commonly used wires in China is:.)

1, etc.). If it is a single-phase electric 220 voltage level, i=p u=, use 70 (, choose 70) square copper wire. If the ambient temperature is high, or the line is long, you can appropriately increase the square number of the first gear cable.

70 kW with 35 square copper core cable. 1 square current is 6-8A, 35 square has 35 times 6A equals 210A, or a larger cable.

Selection of wires and cables: When selecting wires and cables, it is necessary to consider the use, radiation conditions and safety; According to different uses, power cables, overhead insulated cables, control cables, etc. can be selected; According to the different perfunctory conditions, general plastic insulated cables, steel belt armored cables, steel wire armored cables, anti-corrosion cables, etc. can be selected; According to the safety requirements, flame retardant cables, halogen-free flame retardant cables, fire-resistant cables, etc. can be selected. When determining the use specifications of wires and cables, conditions such as heat generation, voltage loss, economic current density, and mechanical strength should be considered.

According to experience, because of its large load current, the cross-section of the low-voltage power line is generally selected according to the heating condition, and then the heating condition and mechanical strength are checked. For high-voltage lines, the cross-section is selected according to the economic current density, and then the heating conditions and allowable voltage loss are checked.

How many kilowatts can be used for 70 square copper heart wire 380v? Hello dear, <>

The squared three-phase copper core car can withstand 109 kilowatts. 2. Calculation method According to the three-phase electric power calculation formula p=i u formula: p-power (w); U-Voltage (380V); cos - power factor (; i-Current-carrying reputation sail call (a); By querying the following table, we get:

When 70 square copper wire is laid in Qingkai air, the maximum safe current carrying capacity i is 195a; Brought in data: i=195a, u=380v, cos=; It is calculated that 70 square copper core wire can withstand the maximum load p=195 380. Z2 hopes to help you.

Let's start with question 2: 40,000 watts are used in a 220V environment, because you haven't explained the distance and material of the wire, so the answer I gave is for reference only, the current of this power is 182A, usually the cross-sectional area of copper wire required for 1A is 6A, so the copper core wire required is not less than 30 square millimeters.

The longer the distance, the greater the wire diameter.

Then the first problem, 70 square wires, can carry 420A of current, so it can carry 220 times 420 92 kilowatts.

However, the above is also affected by the quality and length of the wire, which cannot be ignored.

<> if it is a copper wire, within 50 meters, 70 square copper wires can be rectified. 40,000 watts is 40 kilowatts, in fact, it is also 70 square copper wire can carry, but the distance should not exceed 50 meters, if it exceeds 50 meters and less than 100 meters, it is necessary to add another gear.

It is recommended to use 35 square millimeters of copper cable (considering the expansion of capacity) and the safe ampacity of 35 square millimeter copper power cord - about 150a (in air) and about 200a (in soil) If it is an aluminum wire, the wire diameter should be times of the copper wire.

If the power of 70kw industrial electricity is used, the three-phase 5-wire current is about 70,000 for air opening, and the multiple of the working current is 132 * 200A for air opening.