Cable knowledge training materials-Henan Sanheng Industrial Co.,Ltd

Cable knowledge training materials

May 28,2018

In the construction of power cables, steel brackets are used, steel protection tubes are used, and cable cards and overhead cables are used. Any galvanic (iron) closed loop is formed around the power cable, and eddy currents may form. Especially in high current power cable systems, eddy currents are greater. In the construction of power cables, measures must be taken to prevent the formation of steel (iron) closed loops around the cables to prevent eddy currents from occurring. How many amperes of current can a 1mm2 power line have, and how much power? For example, if 2.5 square meters of wire are used, how much wire should be used in construction?

Cable knowledge training materials ppt

Basic knowledge of wire and cable training

1 For 1.5, 2.5, 4, 6, 10mm2 wires, multiply the cross-sectional area by 5 times.

2 For 16 and 25mm2 wires, multiply the cross-sectional area by 4 times.

3 For 35, 50mm2 wires, multiply the cross-sectional area by 3 times.

4 For 70, 95mm2 wire can be multiplied by 2.5 times its cross-sectional area.

5 For 120, 150, 185mm2 wires, multiply the cross-sectional area by 2 times.

Operating temperature 30 °C, long-term continuous load current under 90% load is as follows:

1.5 mm 2 - 18A

2.5 mm 2 - 26A

4 mm 2 - 26A

6 square millimeters - 47A

10mm2 - 66A

16 mm2 - 92A

25mm2 - 120A

35 square millimeters - 150A

Power P = voltage U × current I = 220 volts × 18 amps = 3,960 watts

National standard GB4706.1-1992/1998 wire load current value (partial)

Copper core wire: copper core cross-sectional area. Permissible long-term current

2.5 square millimeters (16A to 25A)

4 square millimeters (25A to 32A)

6 square millimeters (32A to 40A)

Aluminum core wire: cross-sectional area of aluminum core wire. Permissible long-term current

2.5 square millimeters (13A to 20A)

4 square millimeters (20A to 25A)

6 square millimeters (25A to 32A)

〖for example〗

1, each computer power consumption is about 200 ~ 300W (about 1 ~ 1.5A), then 10 computers need a 2.5 square mm copper wire power supply, otherwise there may be a fire.

2. The air-conditioning power consumption of the big three air-conditioners is about 3000W (about 14A), so a single air-conditioner needs a separate 2.5-mm square copper core wire to supply power.

3, the current housing into the line is generally 4 square millimeters of copper wire, therefore, at the same time open the household appliances shall not exceed 25A (5500 watts), it was no use to replace the wires in the house to 6 square millimeters of copper wire Because the wire entering the meter is 4 square millimeters.

4. In the early housing (15 years ago), the incoming line was generally 2.5 square millimeters of aluminum wire. Therefore, household appliances that were turned on at the same time must not exceed 13 A (2,800 watts).

5, household appliances with relatively large power consumption are: air conditioner 5A (1.2 horsepower), electric water heater 10A, microwave oven 4A, rice cooker 4A, dishwasher 8A, washing machine 10A with drying function, electric water boiler 4A caused by the power 90% of fires are caused by joint heating, so all joints must be welded. Contact devices that cannot be welded must be replaced within 5 to 10 years (such as sockets, air switches, etc.).

National standard allowable long-term current

4 square is 25-32A

6 square is 32-40A

In fact, these are theoretical safety values, and the limit values are even greater than these.

The maximum allowable power of the 2,5 square copper wire is: 5500W; 4 square 8000W, 6 square 9000W is no problem.

40A digital power meter normal 9000W absolutely no problem. The mechanical 12000W will not be burned.

Henan Sanheng Industrial Co., Ltd. , founded in 2000, It is one of the top wire and cable manufacturers in China's wire and cable industry for nearly 20 years. the company has more than 5 production lines.

The production cable can be divided into more than 50 varieties and subdivided into 1000 specifications.All products have passed national certification, such as China compulsory certification, bv certification, Nigerian SONCAP certificate, China national industrial certification, etc. China national industrial production license, etc.It also has the ability to produce products that meet international standards, such as iec, ce, rohs, etc.
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