How can I buy qualified wires and cables

1. Check the certification mark. For products that have obtained compulsory certification, the certification mark, that is, the "CCC" mark, should be affixed to the prominent position of the product, otherwise, it is an unlicensed product.

2. Look at the inspection report. Wire and cable, as a product that affects the safety of people and property, has been listed as the focus of government supervision and inspection, and regular manufacturers are subject to inspection by the supervision department on a periodic basis. Therefore, the seller should be able to provide the inspection report of the quality inspection department, otherwise, there is no basis for the quality of the product.

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

4. Observe the finish and color of the thread body. 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 Causes a decrease in conductivity.

5. Measure DC resistance. In order to ensure that the quality of the wires and cables purchased is qualified, you can first intercept 3 to 5 meters from the products you want to buy to the inspection agency for DC resistance measurement.

Sixth, measure the length. National standards have clear regulations on 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 should not exceed 0.5% of the total length. , If the lower limit of the standard is not reached, it is unqualified.