Do you really understand the wires needed for ever

2022-07-22
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There are many brands of wires, such as Shanghai Panda, Hangzhou Yongtong, Ningbo Qiuguan, etc. of course, there must be fake goods after the brand popularity has been established. When purchasing, you can pay attention to the following points:

there are many brands of wires, such as Shanghai panda, Hangzhou Yongtong, Ningbo Qiuguan, etc. of course, there must be fake goods after the brand popularity has been established, When purchasing, you can pay attention to the following points: 1. Identify the manufacturer and brand of the packaging to prevent buying fake goods (such as “ Zhongce Yongtong ” wires, which are well-known in Hangzhou, and “ Zhongce ” “ Yongtong Zhongce ” in Shanzhai, and the factory name imitates the brand name, etc.). Is there “ China's compulsory product certification on the wire packaging plate as a roll; CCC” And production license number; Check whether there is quality system certification; Check whether the certificate of conformity is standardized; Check whether there is factory name, address, maintenance seal and production date; Check whether the trademark, specification, voltage, etc. are printed on the wire. 2. The length and thickness of a coil of wire are 100m, and the length error of the national standard is not more than 0.5%, that is, it cannot be less than 99.5m. The national standard data of cross-section is not found, and the commonly used cross-sectional area is 1.5mm? 2; The weight of plastic insulated single strand copper core wire per 100m is 1.8 ~ 1.9kg; 2.5mm? 2; The weight per 100m is 3 ~ 3.1kg. The wire with poor quality has insufficient weight or length, or there are too many impurities in the copper core. 3 eccentricity cut off a section of insulation layer to see whether its wire core is in the middle of the insulation layer. What is not in the middle is the core deviation caused by low technology. Once the power consumption is large, the thinner side is likely to be broken down by current. 4. The insulating layer can take a wire head and bend it repeatedly by hand. Those with soft hand feeling, good fatigue resistance, large elasticity of plastic or rubber hand feeling and no cracks on the wire insulator are excellent products. The outer plastic skin of the wire should be bright and fine, and there should be no open fire when ignited with a lighter

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