How to distinguish between good and bad cables

1. Look at the appearance and certificate: we look at the certification certificate of the quality system required by the manufacturer to see whether the certificate is standardized; Whether there is factory name, address, inspection seal, production date, etc. It also depends on whether the cable itself has trademark, specification, voltage, etc. It also depends on the cross section of the copper core of the wire. The high-quality red copper has bright color and soft color.

2. Weighing: good quality wires are generally within the specified weight range. For example, the commonly used cross-sectional area is 1. 5 square plastic insulated single strand copper core wire, with a weight of 1 per 100m. 8~1。 9KG，2。 5 square plastic insulated single strand copper core wire, with a weight of 3 ~ 3 per 100m. 1kg。 The cable with poor quality has insufficient weight, or the length is not enough, or the copper core of the wire has too many impurities.

3. To try: take a piece of electric wire head and bend it repeatedly. The wires with soft hand feel, good strength resistance, large elasticity of plastic or rubber and no cracks on the wire insulation are generally national standard wires.

4. Look at the price: because poor wires are generally produced with poor materials in order to reduce the cost, the price is generally one of the important means of differentiation.

5. Look at the copper quality: qualified copper core wire. The copper core is purplish red, shiny and feels good. The inferior copper core is purple black or yellow, white, with many impurities, poor mechanical strength and insufficient flexibility. It will break with a little force. And there are often short wires in wires. We usually peel off the wire head and draw it on the white paper with the copper core. If there is black residue on the white paper, it means that there are many impurities in the copper core, which is non marking.