What are the characteristics of qualified cable

With the rapid development of modernization, wires and cables can be said to be applied to every corner of us, and major industries have also applied them, so the demand for wires and cables has also increased. Although the demand has increased, we still have to strictly control the quality and make every wire and cable well. But do you know what characteristics qualified wires and cables have? Today I am going to tell you about it.

Qualified wire and cable features:
1. Check the certification mark. Products that have obtained compulsory certification should be affixed with the certification mark, that is, the "UL" mark, in a prominent position of the product.

2. look at the inspection report. As products that affect personal and property safety, wires and cables have always been listed as the focus of government supervision and inspection, and regular manufacturers are subject to inspections by supervision departments on a periodic basis. Therefore, the seller should be able to provide the inspection report of the quality inspection department, otherwise, there will be no basis for the quality of the product.

3. Detection of insulation and sheath. The thickness of insulation and sheath should be uniform without deflection, and there should be obvious tension and elongation by hand. At the same time, the surface of the insulation and sheath should have the manufacturer's name and product model continuously printed marks, and the mark interval: the insulation should not exceed 200mm, and the sheath should not exceed 500mm.

4. observe the line body finish and color. The copper conductor of the wire and cable is metal-plated or non-metal-plated annealed copper wire, the aluminum conductor is aluminum or aluminum alloy wire, the surface is smooth, the copper conductor is light purple, and the aluminum conductor is silver-white, otherwise, the conductor is likely to be mixed with other impurities, thus cause a decrease in electrical conductivity.

5. measure the DC resistance. In order to ensure that the quality of the purchased wire and cable is qualified, 3-5 meters can be intercepted from the product to be purchased to the inspection agency for DC resistance measurement.

6. the amount of length. The national standard clearly stipulates the delivery length of wires and cables. The length of the coil should be 100m, and the length of the coil should be greater than 100m. Consumers can measure the length according to the label. The standard stipulates that the length error does not exceed 0.5% of the total length. , if the lower limit of the standard is not met, it is considered unqualified.