Enameled Copper Wire

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Enameled copper wire, the core winding material for motors, transformers and new energy electrical equipment, has its temperature withstand, breakdown voltage and other critical performance parameters strictly regulated by international IEC standards and national GB/T systems, forming a complete testing framework covering full lifecycle performance verification.

For temperature withstand performance, the standard system classifies enameled copper wire into clear thermal classes including Class 130 (B), Class 155 (F), Class 180 (H) and Class 220 (C). The thermal endurance test follows the IEC 60172 specification, which requires placing test specimens in a constant temperature oven for multi-stage accelerated aging, and calculates the 20000-hour continuous operating temperature through the Arrhenius curve to confirm the long-term thermal stability of the enamel insulation. For breakdown voltage testing, the standard specifies that the test shall be carried out in a cylindrical electrode environment at 23°C ± 2°C, and the minimum breakdown voltage value of Grade 1 and Grade 2 enamel films must meet the corresponding thresholds according to different wire diameters, to ensure the electrical insulation reliability under operating voltage surges. Other key parameters including pinhole continuity, cut-through resistance and solderability also have corresponding standardized test methods, covering electrical, mechanical and chemical performance dimensions.

Authoritative Standards

1. IEC international general specification for winding wire thermal endurance testing: IEC 60172:2021
2. IEC international standard for general test methods of enamelled round copper wires: IEC 60851-1:2021
3. IEC international standard for breakdown voltage test of winding wires: IEC 60851-5:2020
4. GB/T national standard for thermal performance test of winding wires: GB/T 4074.6-2008
5. GB/T national standard for breakdown voltage test of winding wires: GB/T 4074.5-2008
6. GB/T national product specification for Class 180 polyester-imide enamelled round copper wires: GB/T 6109.2-2008