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 ~ 1.9 kg per 100 m; 2.5 mm2 plastic insulated single strand copper core wire, with a weight of 2.8 ~ 3.0 kg per 100 m; 4.0 mm2 plastic insulated single strand copper core wire, with a weight of 4.1 ~ 4.2 kg per 100 m, etc. The wire with poor quality has insufficient weight, or insufficient length, or too many impurities in the copper core of the wire.
2 copper. The copper core of qualified copper core wire shall be purplish red, shiny and soft. The fake and shoddy copper core wire is purple black, yellow or white, with many impurities, poor mechanical strength and poor toughness. It will break with a little force, and there are often wire breaks in the wire. During the inspection, you just peel off one end of the wire for 2 cm, and then rub it on the copper core with a piece of white paper. If there is black material on the white paper, it indicates that there are many impurities in the copper core. In addition, the insulation layer of fake and shoddy wires seems to be very thick. In fact, most of them are made of recycled plastic. Over time, the insulation layer will age and leak electricity.
3. Manufacturer. Fake and shoddy wires are often “three no products”, but they also have ambiguous origin and other marks, such as made in China, made in a province or city in China, which is actually equal to the unmarked origin.
4 price. Due to the low production cost of fake and shoddy wires, vendors often sell at low prices under the guise of low price and good quality.