How to judge the quality of wire and cable?

Wire and cable inspection and implementation of the "check" and "prevention based" approach. The quality inspection of wire and cable products is not limited to product quality inspection. It also includes quality inspections of various factors affecting the product's production quality during the entire production process from raw material entering the factory to finished products leaving the factory. Therefore, product quality inspection The scope and content are relatively extensive. Specifically, the quality inspection of wire and cable products can include the following aspects:

1. Quality inspection of raw materials, auxiliary materials, outsourcing, and related parts and components used for manufacturing wire and cable;

2. Inspection of mechanical equipment used to manufacture wire and cable;

3, production of wire and cable used in the fixture, mold, process equipment inspection;

4. To supervise and inspect the construction process cards of each process of wire and cable manufacturing.

5, manufacturing a variety of formulations used for wire and cable inspection;

6, factory inspection after completion of wire and cable;

7, manufacturing wire and cable production environment inspection;

8, the production of wire and cable measurement tools, scales, instrument inspection.

The inspection methods of wire and cable products are various. According to the different inspection methods and roles, they can be divided into the following types:

1. According to the process stage: pre-inspection and intermediate inspection;

2. Divided by inspection location: fixed inspection, flow inspection or call inspection;

3, divided by inspection personnel: self-test that is self-check and full-time inspection;

4, divided by the number of inspections: ordinary inspection and sampling inspection;

5, there is a preventive test, usually refers to the first test and statistical test. The first inspection is the quality inspection of the first event. The so-called statistical test is the use of mathematical statistics and the principle of probability, through the inspection and analysis of a certain number of products, to determine the quality of products and its development trend of a test method.

6. Factory inspection tests include routine tests, sampling tests and type tests.

One, common cable current carrying capacity:

500 and below copper-core plastic insulated wire air laying, working temperature 30 °C, long-term continuous load current under 100% load is as follows.

1.5 mm 2 - 22A

2.5 mm 2 - 30A

4 mm 2 - 39A

6mm2 - 51A

10 mm2 - 74A

16 mm 2 - 98A

Second, households are generally single-phase, and the maximum power they can receive (Pm) is: Take 1.5 square millimeters as an example.
Pm = voltage U × current I = 220 volts × 22 amps = 4 840 watts The safety factor is 1.3, then its long-time operation, the allowable power (P) is:

P=Pm÷1.3=4840÷1.3=3723W “1.5 square” copper wire. Can withstand a load of 3,723 watts.

Third, 1.5 mm 2 copper core cable safe carrying capacity is 22A, 220V can withstand 3723W power for a long time, so the requirements of 24 hours to withstand 2000 Watts of power is completely no problem.

The safe ampacity of the general copper conductor ampacity wire is determined according to the allowable maximum core temperature, cooling conditions, and laying conditions. The safe current-carrying capacity of copper wires is generally 5~8A/mm2, and the safe current-carrying capacity of aluminum wires is 3~5A/mm2.

In view of the above, the current power attenuation is very bad, plus the quality of power equipment is equalized, so the safe electricity is 6A per square meter.

The use of electricity at 7A per square meter, the safe use of electricity should be 6A per square meter, if you need to calculate it should be 1.5 square meters × 6A = 10.5A

10.5A×220W=2310W

This is 1.5 single shaft maximum output power such as: 1.5mm2BV recommended value of safe current carrying capacity of copper wire 1.5 × 8A/mm2 = 12A220V voltage is power = voltage × current = 220 × 12 = 2640 watts = 2.64 kW should be based on load Current to calculate the power, 1.5 square copper core cable can carry nearly 25A current, can be used for three-phase power equipment rated voltage 380V below 2.5KW motor), can be used for single-phase lighting (rated voltage 220V) equipment, Each phase can carry single-phase equipment below 2.5KW.

When the three-phase motor connection cable is not too long (within 10 meters), it can load 2.5KW (10.5A), and the corresponding load of the line segment is too long to reduce. Generally, the current is selected from 4 to 6A per square carrier, the long line takes a small value, and the short line takes a large value.

The management of the threading of the two 1.5 square copper wires is 3 square meters and the actual load is kW. The voltage at 220V is 2.64 kilowatts. The current-carrying capacity is constant, and the power changes with the voltage 2.5 square. The current carrying capacity of the copper wire is 15-23A. If it is single-phase power, it can bring 5kW, and the three-phase power can bring 9kW.

The 10 square copper core line can load many kilowatts. If used at 220V, the open line layout allows continuous load current to be 70A, which is equivalent to 15.4 kilowatts. The two lines are arranged in a single line tube, allowing a continuous load current of 60A, equivalent to 13.2 kilowatts; The three wires are arranged in a single line tube, allowing a continuous load current of 55A, which is equivalent to 12.1 kilowatts.

In general, one horse has a large amount of cooling capacity of 2,000 kcal and an international unit should be multiplied by 1.162. Therefore, the cooling capacity of one horse is 2,000 kcal × 1.162 = 2324 watts, and the watt (w) is For the cooling capacity, the 1.5 horses should be 2000 kcal x 1.5 x 1.162 = 3486 (w), and so on. Based on this situation, the number of air conditioners and the cooling capacity can be roughly determined. Under normal circumstances, 2200 (w) ~ 2600 (w) can be called 1 horse, 4500 (w) ~ 5100 (w) can be called two, 3200 (w) ~ 3600 (w) can be called 1.5 match.

The maximum current of 1.5 air conditioners is Imax=3600/220=16.4A

V-type copper wire) The square of the wire is calculated based on the round area of ​​the wire.

The following is the copper conductor safety current:

0.75 square MM^2, diameter 0.23MM, number of roots 19, current 5A.

1.0 square MM^2, diameter 0.26MM, number of roots 19, current 7A.

1.5 square MM^2, diameter 0.32MM, number of roots 19, current 10A

2.5 square MM^2, diameter 0.41MM, number of roots 19, current 17A

6.0 square MM^2, diameter 0.64MM, number of roots 19, current 40A

10. Square MM^2, Diameter 0.52MM, Number of Roots 49, Current 65A

The copper safety calculation method is:

2.5mm2 copper power line safe carrying capacity -28A.

The safe current carrying capacity of 4mm2 copper power line is 35A.

The safe current carrying capacity of 6mm2 copper power line is 48A.

10mm2 copper power line safe carrying capacity - 65A.

The safe current carrying capacity of 16mm2 copper power line is 91A.

25mm2 copper power line safe carrying capacity --- 120A.

If it is an aluminum wire, the wire diameter should be 1.5-2 times that of the copper wire.

If the copper current is less than 28A, it is safe to take 10A per square millimeter.

If the copper current is greater than 120A, take 5A per square millimeter.

The current through which the cross-sectional area of ​​the wire can normally pass can be selected according to the total number of currents that it needs to conduct. Generally, it can be determined as follows:

This means that aluminum wire below 10 squares can be multiplied by 5 in square millimeters. If the copper wire is used, it can be increased by one file. For example, if the copper wire is 2.5 square meters, it should be calculated as 4 squares. More than 100 square meters should be cross-sectional area. Multiply by 2, 25 squares and multiply by 4, 35 squares and more by 3, and pick up and Nine Five are multiplied by 2.5.

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