1. Check the "CCC" certification mark. Wire and cable products are national compulsory safety certification products. All manufacturers must obtain the "CCC" certification certified by the China Electrical Product Certification Commission, and have the "CCC" certification mark on the certificate or product.

2. Look at the inspection report. Regular manufacturers are inspected by the supervision department on a periodic basis. Therefore, the seller should be able to provide the inspection report of the quality inspection department, otherwise, the quality of the wire and cable products will be lack of basis.

3. Look at the packaging. When purchasing, pay attention to exquisite packaging, clear printing, complete model specifications, factory name and factory address.

4. Look at the exterior. The appearance of wire and cable products produced by regular manufacturers meets the standard requirements, is smooth and round, and has uniform color. The fake and shoddy products are rough and dull in appearance. For rubber insulated flexible cables, the appearance is required to be round, and the sheath, insulation and conductors are tight and not easy to peel off. The fake and shoddy products have rough appearance, large ovality, and low insulation strength of the sheath, which can be torn by hand.

5. Look at the conductors. Wire and cable products that meet the requirements of national standards, whether they are aluminum conductors or copper conductors, are relatively bright and free of oil pollution, so the DC resistance of the conductors fully conforms to the national standards, with good electrical conductivity and high safety.

6. Measure the length of the wire and cable. When purchasing, do not be greedy for cheapness, and choose wires and cables whose actual meters are lower than their nominal meters. The length must match the nominal meter. The state stipulates that the allowable error is ±0.5 meters per 100 meters.