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2. It is advisable that a wire head be repeatedly bent by hand, and that any product that has a soft hand, a good anti-fatigue strength, a large elasticity of a plastic or rubber feel, and no cracks on a wire insulator is an excellent product.
3. Take a section of insulation to see if the core is in the middle of the insulation. Non-centered is due to the fact that the process is not high and the eccentricity phenomenon is caused. If the power is small, it can be safe when used. Once the power is used, the thinner side may be broken down by the current.
4. It is necessary to look at the length and core thickness of the core. According to the relevant standards, the error of the wire length must not exceed 5%, and the cross-sectional wire diameter must not exceed 0.02%.
How to check the quality of the wire?
1. See if there is a quality system certification; see whether the certificate is standardized; see if there is a factory name, site, inspection seal, and production date; see if the trademark is printed on the wire, specifications, voltage, etc. It also depends on the cross-section of the copper core of the cable. The superior product has a bright, soft color and a reddish yellow color in the copper core, indicating that the copper used is of good quality, while the yellow and white is the reaction of the low-grade copper. Otherwise it is defective.