1. Check if there are trademarks, specifications, voltages, etc. printed on the cables. It also depends on the cross-section of the copper core of the wire. The high-quality copper is bright in color and soft in color, otherwise it is inferior.

2. Try it. It is recommended to bend a wire head repeatedly by hand. Anything with soft hand feel, good fatigue resistance, plastic or rubber hand feel elastic and no cracks on the wire insulator is the best product.

3. Weigh the 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 1.5mm2 has a weight of 1.8~1.9kg per 100m; a 2.5mm2 plastic insulated single-strand copper core wire has a weight of 3~3.1kg per 100m; 4.0mm2 of plastic Insulated single-strand copper core wire, weighing 4.4～4.6kg per 100m, etc. Poor quality wires have insufficient weight, either the length is insufficient, or the copper core of the wire is too impurity.

4. Compare the price. Due to the low production cost of counterfeit and shoddy wires, vendors often sell them at low prices under the guise of low prices and good quality when selling.

5. Look at copper. The copper core of the qualified copper core wire should be purple-red, shiny, and soft to the touch. The fake and inferior copper core wires are purple-black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, and will break with a little force, and there are often broken wires in the wires. When checking, you just need to peel off the wire 2cm, and then rub a piece of white paper on the copper core. If there is black substance on the white paper, it means that the impurities in the copper core are relatively high.