Consumers should pay attention to the following issues when purchasing qualified wire and cable:
First, check the certification mark. Products that have obtained compulsory certification shall be marked with a certification mark in a prominent position on the product, that is, the “CCC†mark, otherwise, it will be a product without a license.
Second, look at the inspection report. Wire and cable, as a product that affects personal and property safety, has long been listed as the focus of government supervision and inspection, and regular manufacturers are inspected by the supervisory department on a periodic basis. Therefore, the seller should be able to provide inspection reports of the quality inspection department, otherwise, the quality of the product is lack of evidence.
Third, testing insulation and sheath. Insulation and sheath thickness should be uniform without deflection, hand induction has a significant tension and elongation. At the same time, the surface of the insulation and sheathing shall have the name of the manufacturer and the type of product to be continuously printed. The mark interval shall be no more than 200mm for insulation and 500mm for sheath.
Fourth, observe the line body finish and color. Wire and cable copper conductors are metallized or not annealed copper wire, aluminum conductor is aluminum or aluminum alloy wire, the surface is smooth, the copper conductor is light purple, the aluminum conductor is silver white, otherwise, the conductor is likely to be mixed with other impurities, Causes a decrease in electrical conductivity.
Fifth, measuring DC resistance. In order to ensure the quality of the purchased wire and cable, you can first intercept 3 to 5 meters from the product you wish to purchase and go to the inspection agency to measure the DC resistance.
Sixth, the length. The national standard specifies the delivery length of wire and cable. The length of the circle should be 100m, and the length of the disc 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. Failure to meet the lower limit of the standard is unqualified.
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