How to identify the advantages and disadvantages of buying wires

Home improvement is inseparable from the wires, especially the old houses. Although the wires are small, the "responsibility" is great. Many fires are caused by the aging of the wire and cable, the unreasonable configuration, or the poor quality of the wire used. Therefore, consumers must polish their eyes when purchasing electric wires, and carefully identify them to prevent them from happening.

The state has stipulated that copper wires should be used in newly built houses. But the same is copper wire, there are also inferior copper wires, the copper core of which is made of recycled copper, contains many impurities, and some of the inferior copper wires are not even as conductive as iron wires, which can easily cause electrical accidents. At present, there are many types of wires, many specifications, and chaotic prices on the market, making it difficult for consumers to select. In terms of the prices of the 2.5 square millimeter and 4 square millimeter copper core wires commonly used in home decoration, the same specification of a coil of wire can vary by 20% to 30% because of different manufacturers. As for the quality, whether the length meets the standard, consumers are even more difficult to determine.

According to industry sources: The reason why the price of the wires is so different is because of the different raw materials used in the production process. The main raw materials for producing electric wires are electrolytic copper, insulating materials and sheath materials. At present, the electrolytic copper in the raw material market is about 60,000 yuan per ton, and the recycled copper is only about 50,000 yuan per ton; the price of high-quality products of insulating materials and sheath materials is 8,000 yuan to 8,500 yuan per ton, and the defective products The price is only 4,000 yuan to 5,000 yuan per ton, the difference is even more disparate. In addition, insufficient length and insufficient glue content of the insulator are also important reasons for the price difference. For each cable length, the superior product is 100 meters, while the defective product is only about 90 meters; the insulator with a rubber content of 35% ~ 40%, and the residual defective product is only 15%. Through comparison, it is not difficult for consumers to see that the difference in the selling price of finished wires is caused by the presence of greasy materials.

So, how to identify the advantages and disadvantages when buying wires?

1. First look at the coiled wire packaging brand, whether there is the "Great Wall Logo" and the production license number of the China Electrotechnical Product Certification Committee; see whether there is a quality system certification; see whether the certificate is standardized; see whether there is a factory name, Factory address, inspection seal, production date; see if trademarks, specifications, voltage, etc. are printed on the wires. Also depends on the cross-section of the copper core of the wire. The superior copper is bright in color and soft in color. The copper core is reddish in yellow, indicating that the copper material used is of good quality, and the yellowing of the yellow copper is a reflection of low-quality copper.

2. You can take a wire head and bend it by hand repeatedly. Anything that is soft to the touch, has good fatigue resistance, has a high elasticity to the plastic or rubber feel, and has no cracks on the wire insulation is a superior product. The outer plastic skin of the wire should be bright in color and fine in texture, and there should be no open flame when lit with a lighter.

3. Intercept a section of insulation to see if its core is in the middle of the insulation. Not centered is the phenomenon of eccentricity caused by the low process. If the power is small, it can be safe. Once the power consumption is large, the thinner side is likely to be broken by current.

4. Be sure to check whether the length and thickness of the wire core are used for hands or feet. It is stipulated in the relevant standards that the error of the length of the wire cannot exceed 5% and the diameter of the cross-sectional wire cannot exceed 0.02%. The line is actually only 2 square millimeters thick).