1. See if the wire meets the requirements of electricity quota, whether there is a product inspection certificate and a special mark for product quality;
2, look at the material of the core, the better the material, the better the quality;
3. Look at the quality of the PVC material of the wire and cable. The better the quality, the lower the probability of leakage;
4, look at the length standard of each coil of wire, the weight is sufficient, the use temperature is -30 to +70 degrees Celsius;