1, brand identification, purchase of standardized brand logo wire and cable. Wire and cable packaging is usually marked with brand or manufacturer, address, contact information, 3C certification number and quality assurance card.

2. Observe the appearance of wire and cable carefully. The conductor of good quality wire and cable should be wrapped in the center of the insulator. The outer surface of the insulator is glossy and uniform. There are no particles, no black coke, no bumps and bamboo deformation.

3. Attention should be paid to the elasticity of insulators. When good wires and cables are peeled, insulators have certain elasticity and are not easy to crack, while worse wires and cables are simply torn or scratched.

4. Comparing with the core color, the high-quality wire and cable has high copper content and bright golden color; the dark red or even black color with burrs on the surface may be recycled scrap copper, with poor quality at one time.

5. Take care of the bending resistance of cables, good copper core of cables is soft and bending resistant, poor bending times of cables are very few and simple breaking.

6. To test its flame retardancy, good cables and wires will be flattened immediately when the flame is detached, while poor ones will be delayed when the flame is detached.