Overview
IEC 60317-70-1:2020 defines the requirements for polyester glass-fibre wound unvarnished and fused, bare or enamelled round copper winding wire with a temperature index of 155. Developed by the International Electrotechnical Commission (IEC), this standard applies to copper wires with specific fibre coverings and properties for use in electrical windings. The nominal conductor diameters are standardized in IEC 60317-0-10, ensuring consistency and compatibility in manufacturing.
This standard is a key reference for specifying insulated winding wires where enhanced thermal and mechanical protection is required, commonly used in transformers, motors, and various electromagnetic coils.
Key Topics
- Types of Winding Wire Covered
- Polyester glass-fibre wound, unvarnished and fused, bare or enamelled
- Grades include: Grade 1 and Grade 2 enamelled round copper wire
- Temperature Index
- Specifies a temperature index of 155, suitable for many industrial winding applications
- Fibre Covering
- Combination of electrical-grade continuous-filament glass and high-grade polyester fibres
- Maximum polyester fibre content: 50% by weight in the yarn
- Thickness Grades
- PG1: 1 layer of polyester glass fibre or 2 finer layers meeting dimensional requirements
- PG2: 2 layers of polyester glass fibre
- Enamelled variations: grade 1/grade 2 combined with PG1 or PG2 layers
- Referenced Dimensions
Note: Heat shock testing is not applicable to this wire type, and therefore, no heat shock temperature class is given.
Applications
This standard is relevant for a range of electrical and electronic industries that require durable and reliable winding wires, such as:
- Transformer Manufacturing
- Used for primary and secondary windings requiring high thermal endurance and mechanical robustness
- Electric Motors
- Suitable for stator and rotor windings exposed to moderate heat and vibration
- Coil Winding
- Ideal for precision coils in reactors, relays, or instrument transformers
- General Electrical Equipment
- Provides insulation and protection where mechanical abrasion and temperature stability are required
By following IEC 60317-70-1:2020, manufacturers and designers ensure that their winding wires meet stringent quality and performance standards, supporting longer life and greater reliability for electrical devices.
Related Standards
For comprehensive guidance and compatibility, the following related IEC standards should be considered alongside IEC 60317-70-1:
- IEC 60317-0-10: Specifications for particular types of winding wires - General requirements for polyester glass-fibre wound fused, unvarnished, or resin/varnish impregnated, bare or enamelled round copper wire
- IEC 60264: Packaging of winding wires
- IEC 60851: Winding wires - Test methods
- IEC 60317 (all parts): Specifications for particular types of winding wires
These standards together offer a complete framework for the selection, testing, and packaging of winding wires ensuring international compatibility and product quality.
For up-to-date references and detailed requirements, always refer to the latest edition of the standards through the official IEC webstore.
Keywords: IEC 60317-70-1:2020, winding wires, polyester glass-fibre, round copper wire, temperature index 155, electrical insulation, enamelled copper, transformer wire standards, IEC standards for winding wires.