Find the table of the corresponding bearing current of the cable

The relationship between the cross-sectional area of the cable and the current isProportionalThe larger the cross-section of the relational cableAmpacityThe larger. About cables.

The current relationship of the diameter, and the calculation formula used, the relationship between the cross-sectional area of the wire and the current, the safety calculation method of copper wire of different square millimeters, the wire diameter of the copper wire at different temperatures and the maximum current that it can withstand**, the calculation formula of the wire diameter of the wire.

The role of the cable

The function of the cable is to transmit electricity, and can transmit signals, or realize electromagnetic energy conversion, which is an electrical product. There are many kinds of its types and specifications, first of all, when transmitting electricity, You Chang can choose a kind of matching cable or power cable. If it is used to transmit signal information, you can choose a TV cable or a fiber optic cable, as well as a local telephone cable.

If it is used for mechanical equipment or some instrumentation, the selected cable includes a wide range, except for overhead bare wires, other chains can be used.

<> cable current-carrying port:

Estimation formula: 2.5 times 9, subtract one straight up and go.

Thirty-five times 3.5, double in a group minus five.

The conditions are variable and converted, and the high-temperature nine-fold copper is upgraded to the friendly level.

The number of pipe roots is two, three, four, eight, seven and six folds full of load current.

Summary. Dear, I am very glad for your question, cable ampacity comparison table and cable selection, to help you inquire: the ampacity of power cables is not easy to determine due to the influence of factors such as laying mode, operating conditions and surrounding environment, and accurately calculate the ampacity of the cable under various complex conditions, which is of great significance to ensure the safe and economical operation of the cable.

I hope mine can help you and I wish you good health and a happy mood!

Cable ampacity comparison table and cable selection.

300kw with how big a copper core cable.

Dear, I am very glad for your question, cable ampacity comparison table and cable selection, to help you inquire: the ampacity of power cables is not easy to determine due to the influence of factors such as laying mode, operating conditions and surrounding environment, and accurately calculate the ampacity of the cable under various complex conditions, which is of great significance to ensure the safe and economical operation of the cable. I hope mine can help you and I wish you good health and a happy mood!

Pro, 300kw with how big cable copper wire needs to use 150 square millimeters or 125 square millimeters of copper wire.

04DX101 Common Data Sheet Inside is more comprehensive.

This can be checked in the relevant manual, or in a simple, inaccurate way, you can check the electrician's manual.

The operating temperature is 30, and the current carrying capacity under the long-term continuous load of 90 is as follows:

18a square millimeter

26a square millimeter

4 mm² 26a

6 mm² 47a

10 mm² 66a

16 mm² 92a

25 mm² 120a

35 mm² 150a

Power p = voltage u current i 220 volts 18 amps 3960 watts standard specified wire load current value (partial).

Copper core wire: ...Cross-sectional area of copper core. Long-term current is allowed. square millimeters (16a, 25a)...

4 mm² (25a, 32a)...6 mm² (32A 40A) Aluminum Core Wire: Aluminum Core Cross-sectional Area. Long-term current is allowed. square millimeters (13a, 20a).

4 mm² (20a, 25a)...6 square millimeters (25A 32A) copper core wire and cable current carrying capacity standard.

<> cable current-carrying port:

Estimation formula: 2.5 times 9, subtract one straight up and go.

Thirty-five times 3.5, double in a group minus five.

The conditions have been changed and converted, and the high-temperature nine-fold copper has been upgraded.

The number of pipe roots is two, three, four, eight, seven and six folds full of load current.

The selection of insulated wires should consider the following aspects:

1) The rated voltage of the wire should be higher than the working voltage of the device;

2) The auxiliary circuit usually adopts multi-strand copper core insulated flexible wire;

3) The cross-sectional area of the conductor should be selected to withstand the maximum allowable long-term working current in the circuit.

Table 2 (Table in Appendix A) applies to the connection of one copper wire on each terminal.

Rated current: Single-core or multi-conductor wire, flexible conductor.

Cross-sectional area Cross-sectional area.

Minimum, Max, Minimum, Max.

a mm2 mm2

You can see that the current carrying capacity of copper cables is mainly determined by the cross-sectional area.

According to the wire current comparison table, the cable carrying current of ZCYJV4 150+1 70 is 355A

The safe current carrying capacity is 350 380A, 100 meters away, the pressure drop will not be too large, and the air switch can be equipped with 400A.

About 360 A in the air and about 345 A in the soil, 100 meters can be done without considering the current loss.

The above data is the current that is stable for a long time and does not affect the design life.

In fact, the short-time passage capacity of the cable can be doubled (2 minutes), and if the design life is not considered, the current can pass 120%-150% without damaging the cable.

The air opening can be matched to 315A-400A

The voltage level is 380V, the rated power is 460KW, and the working current is approximately: I=460 (

The area selected for aluminum core cable: s=874 square millimeters.

According to the specifications of the aluminum wire, it should be selected: 3 aluminum core 4x240 cables should be used in parallel.

460kw with the formula to calculate its current is about 920A, your current carrying capacity is only 312A, definitely not, formula: i=p root number 3*U*COS

Current = power 460000w power factor.

Do the math yourself.

The current is about 822 amps, and you can check the wire that allows this current in the comparison table.

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

Then calculate the current yourself.

This line is definitely not enough, 460kw, calculated according to 2A per kW, the current is 920AIf they are running at the same time, three 4x240 cables are required to be used in parallel.