The GB/T 4074.5 - 2008 standard belongs to the category of winding wire test methods, focusing on winding wire electrical performance testing. It systematically specifies the specific methods and procedures for the measurement of winding wire resistance, insulation resistance, dielectric strength and other electrical performance indicators. Through strict implementation of this standard, the conductive and insulating performance of winding wires can be accurately evaluated. It provides a key basis for the production quality control of winding wires, product design and safe and reliable application in electrical equipment, and promotes the technical specification and mass improvement of winding wire industry.