1. Check the appearance
When purchasing, pay attention to check whether the appearance is smooth and round, the color is uniform, and the hand feels good. For rubber wires and cables, the sheath and insulation can be burned with cigarette butts, and the surface is completely undamaged.
2. Check the conductor
The conductor must have a certain luster and moderate flexibility, and the final size of the conductor must meet the requirements of the national standard. For the cross-section of the copper core of the wire and cable, the high-quality copper is bright and soft in color, The thicker the conductor diameter, the wire and cable generally have higher conductivity and higher current capacity, but the place of use and safety factors also need to be considered.
3. Check the length
When purchasing weak current cables, don't be greedy for cheap prices. When purchasing wires and cables that are only 90m or 80m long, or even without length markings, the length must meet the standard requirements of 100(+/-)0.5m.
4. Test with fire
As the saying goes, real gold is not afraid of fire, copper wires can also be distinguished by fire. As soon as the windproof lighter is fired, it will appear. The real copper wire is very resistant to high temperature. There is absolutely no problem for more than one minute, but the color will change a little at most; The iron one will show up when you scrape it with a knife after burning.
