Overview
IEC 60317-56:2017 is an international standard published by the International Electrotechnical Commission (IEC) that defines the specifications for particular types of winding wires. This part 56 standard specifically addresses solderable fully insulated (FIW) zero-defect polyurethane enamelled round copper wire, class 180. The standard defines the requirements for fully insulated round copper wires coated with a single layer of polyurethane enamel resin, which can be chemically modified as long as the resin's identity and performance meet the technical specifications.
This edition, published in 2017, supersedes the first edition from 2012, incorporating technical revisions such as a narrowed scope to three grades of FIW (4, 6, 8) and a reduced diameter range of 0.090 mm to 0.900 mm. An informative annex on abrasion resistance for FIW grades 3 through 9 has also been added.
Key Topics
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Wire Specification
Focus on fully insulated, solderable polyurethane enamelled round copper wires designed for electrical windings.
- Grade Range: FIW grades 4, 6, and 8
- Diameter Range: 0.090 mm to 0.900 mm
- Thermal Class: Class 180, supporting at least 180°C temperature index and a heat shock temperature of 200°C.
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Material and Coating
Uses a single coating of polyurethane resin enamel which may be chemically modified without altering its core properties. This ensures excellent electrical insulation and mechanical robustness.
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Performance and Testing Requirements
The standard defines specific tests and requirements for:
- Electrical resistance and continuity of insulation
- Mechanical properties such as elongation, springiness, flexibility, adherence, and cut-through resistance
- Thermal properties including heat shock resistance and temperature index
- Resistance to abrasion, solvents, refrigerants, and transformer oil
- Solderability and compatibility with heat or solvent bonding processes
- Breakdown voltage and dielectric dissipation factor
- Pin-hole testing and loss of mass evaluations
These rigorous testing methods ensure zero-defect quality and reliable electrical performance.
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Packaging
Requirements for wire packaging to ensure protection during shipping and handling.
Applications
IEC 60317-56:2017 varnished copper wires are widely used in electrical engineering and electronics industries where high-performance winding wires are needed. Typical applications include:
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Electric motors and transformers
The zero-defect polyurethane enamel coating provides excellent insulation and thermal endurance required for motor windings and transformer coils.
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Electromechanical devices
High reliability in solenoids, relays, and other magnetic devices that require solderability and mechanical flexibility.
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Electronic components and coils
Compact coils and inductors where abrasion resistance, temperature endurance, and excellent solderability are critical for manufacturing quality and longevity.
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Automotive and aerospace winding applications
Where thermal resistance (Class 180) and mechanical durability are mandatory under harsh operating conditions.
Related Standards
IEC 60317-56:2017 is part of the extensive IEC 60317 series that specifies particular types of winding wires. It is closely linked with other relevant standards including:
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IEC 60317-0-7
General requirements for fully insulated (FIW) zero-defect enamelled winding wires, which includes definitions, test methods, and general technical conditions.
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IEC 60851 series
Covers test methods for winding wires, complementing the specifications by ensuring consistent evaluation of wire quality.
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IEC 60264 series
Specifies the packaging requirements for winding wires, critical for minimizing damage during transportation and storage.
Together, these standards ensure that electrical winding wires meet international performance, safety, and quality requirements.
IEC 60317-56:2017 serves as a critical benchmark for manufacturers and engineers seeking high-quality polyurethane enamelled winding wires with superior solderability, insulation, and thermal performance. Compliance with this standard guarantees that winding wires are fit for use in advanced electrical devices requiring precision, durability, and zero-defect insulation properties.
Open preview (PDF)Specifications for particular types of winding wires - Part 56: Solderable fully insulated (FIW) zero-defect polyurethane enamelled round copper wire, class 180
