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# How many kilowatts can a square copper wire carry?

2019-09-12 10:25:04

The safe carrying capacity of 4 square millimeter copper core open-wire device is 37 amples; the safe carrying capacity of two wires through steel pipe is 30 amples; and the safe carrying capacity of three wires through steel pipe is 27 amples.

Current Accounting Formulas for Electric Heating, Incandescent Lamp, Halogen Tungsten Lamp (Tungsten Iodide Lamp, Tungsten Bromide Lamp)

220V single-phase 1000W 4.5 amperes; current (ampere) = power (watt) / 220V;

380/220 V three-phase

Four-wire 1000 Watt 1.5 ampere; current (ampere) = power (watt) / 1.73 * 380 volts;

380/220 volt

Two-phase three-wire 1000 W 2.3 ampere; current (ampere) = power (W) / 440 V; phase line neutral current is the same; 380 V single-phase 1000 W 2.7 ampere; current (ampere) = power (W) / 380 V;

The long-term current promised by the national standard: 4 square copper core wire is 25-32A. This is the theoretical safety value and the limit value is 8000w. The meter should be 10 (20) amperes.

According to the formula, three-phase (380v) should not be greater than copper: 28kw; aluminum: 22KW (power factor 1, and not far apart), single-phase (220v) should not be greater than copper: 10kw; aluminum: 7kw.

The standard carrying capacity of 4-square insulated aluminium wire is about 33A (at 30 degrees Celsius), and 4-square copper insulated wire is 42A. The open wire can carry 7000W electrical power, and the maximum power of the dark wire is about 5500W.

The maximum allowable carrying capacity of open laying of 4 square copper core wire is about 35-40A, i.e. 7-8KW load. According to your description, the load of your home is basically about 7-8 KW, 4 square copper core wire is barely available, the carrying capacity of the wire through the pipe should be discounted by 8%, and the power-saving wire may be hot and scorched in high temperature in summer. Therefore, the usual use of electricity as far as possible to prevent all electrical appliances open together.

How many kilowatts can a four-square wire carry?

In 220V single-phase AC circuit, the load power is as follows:

4mm? Copper core insulated wire can be 5.4kw~9kw;

4mm? Aluminum core insulated wire can be 5 kw~7 kw.

Under different laying modes, ambient temperatures, conductor temperatures and other conditions, the safe carrying capacity of insulated conductors is different, and the load power of insulated conductors is also different.

In 220 V single-phase AC circuit, according to the power formula P=UIcos_, the power of conductors with different carrying capacity is calculated.

The safe current carrying capacity of 4mm? Copper core insulated wire is 26A~42A, and the corresponding power P=220*26~42)*0.95=5434~8778W.

The safe current carrying capacity of 4mm? Aluminium core insulated wire is 22A ~ 34A, and the corresponding power P = 220 * (22 ~ 34) * 0.95 = 4958 ~ 7106W.

In 380V three-phase AC circuit, according to the power formula P=3UIcos_, the power of conductors with different carrying capacity is calculated.

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