When changing the brand of enameled wire, pay attention to the following matters:

1. Whether it has qualifications, production license, UL certification, etc. The brand's reputation in the market, or the name of downstream customers. For example, if he works with Samsung and Sony, he can feel more at ease.

2. Require suppliers to provide specification approval letters and samples, as well as relevant 6-item reports.

3. When conditions permit, do a comprehensive performance test. After passing the test, the engineering department will make samples. The specification approval letter includes product standards and inspection standards. If you cannot do a comprehensive performance test of copper wires, you should try your best to do what you can. Voltage, normal pinholes and Bend pinhole, size, resistance, hot stamping, etc.

4. If the performance test and engineering department proofing are qualified, small batch production can be carried out.

5. Small batch production can be qualified. Follow the normal procedure.