(1) Weight. Good quality wires are generally within the specified weight range. For example, the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of ??1.5 mm2 weighs 1.8 to 1.9 kg per 100 m; the plastic insulated single-strand copper core wire with a cross-sectional area of ??2.5 mm2 weighs per 100 m. 2.8 to 3.0 kg; 4.0 mm2 plastic insulated single-strand copper core wire weighs 4.1 to 4.2 kg per 100 m, etc. Poor quality wires have insufficient weight, are either not long enough, or have too many impurities in the copper core of the wire.
(2) Copper. The copper core of qualified copper core wires should be purple-red, shiny, and soft to the touch. The copper core of fake and inferior copper core wires is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will break with a little force, and there are often disconnections in the wires. When checking, you only need to peel off 2 cm from one end of the wire, and then rub the copper core with a piece of white paper. If there is black substance on the white paper, it means there are more impurities in the copper core. In addition, the insulation layer of fake and inferior wires seems to be very thick, but in fact most of them are made of recycled plastic. Over time, the insulation layer will age and leak electricity.
(3) Manufacturer. Counterfeit and shoddy wires are often "three-no products", but they also have ambiguous origin and other markings on them, such as made in China, made in a certain province or city in China, etc. This actually means that the origin is not indicated.
(4) Price. Since the production cost of counterfeit and shoddy wires is low, vendors often use the guise of low price and high quality to sell them at low prices, which deceives people.
1. Depends. Check whether there is a quality system certification; whether the certificate of conformity is standardized; whether there is the factory name, factory address, inspection seal, production date; whether there are trademarks, specifications, voltage, etc. printed on the wires. Also look at the cross-section of the copper core of the wire. High-quality copper is bright and soft in color. The copper core is yellowish and reddish, indicating that the copper material used is of better quality, while yellowish whiteness is a reflection of low-quality copper. Otherwise, it is a defective product.
2. Try. You can take a piece of wire and bend it repeatedly by hand. Any wire that feels soft to the touch, has good fatigue resistance, has high plastic or rubber feel and has no cracks on the wire insulator is a high-quality product.
3. Cut off a section of the insulation layer to see if the core is located in the center of the insulation layer. What's not centered is the eccentric phenomenon caused by low craftsmanship. If the power is small during use, it will be fine. Once the power consumption is large, the thinner side is likely to be broken down by current.
4. Be sure to check whether the length and core thickness have been tampered with. It is stipulated in the relevant standards that the error in the length of the wire cannot exceed 5%, and the cross-sectional diameter cannot exceed 0.02%. However, there are a large number of people in the market who are short on the length and deceive in the cross-section (such as marking the cross-section as 6 square meters). millimeter line is actually only 4.5 square millimeters thick).