Judging from the results of the quality inspection of wire and cable products published by the industrial and commercial departments of each place every year, the wire and cable market is mixed, and many products have quality problems. The main reason is that the conductor resistance at 20 °C does not meet the relevant standards, wire and cable materials. Inferior and so on. Although the industrial and commercial department will punish some manufacturers with quality problems, consumers should pay attention to the purchase of wire and cable products, so that they can "see three to ask for advice", and "three look" is to look at the appearance and material of the cable and cable. Logo, cable length and cross section, "a consultation" is to consult an experienced professional electrician.
1. Look at the appearance and material of the cable. When checking the appearance and material of the cable, it is necessary to see whether the outer plastic is bright and fine, and there is a burr bump, because the appearance of the good wire and cable will be very detailed. When observing the cable cross section, it should be known that the copper core should be in the middle position and the outer plastic layer should be thin and even.
2. Look at the identification of the cable. The product certification of regular wire and cable will have detailed product information, such as: product model, specification, rated voltage, number of cores, production date, implementation standard, license number, etc. Some products will also be printed with the name of the factory and products. The continuity of the model and rated voltage, if the logo is incomplete or not cleaned, may be a poor quality product produced by a small workshop.
3. Look at the length and cross section of the cable. The main thing is to look at the length of the wire marked on the certificate, but also the diameter of the conductor.
4. Ask an experienced electrician. When selecting the wire and cable, the professional electrician can recommend the appropriate cable according to the load of the home, and purchase the product with the cross-section and voltage rating.