IEC 60317-55:2013

Overview

IEC 60317-55:2013 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the requirements for solderable polyurethane enamelled round copper winding wire overcoated with polyamide, classified as class 180. This standard defines the essential parameters and testing methods for dual-coated copper wires, featuring a polyurethane resin base coat with a polyamide topcoat. It focuses on ensuring high thermal resistance and solderability, making it suitable for reliable electrical winding applications exposed to elevated temperatures.

This edition, which cancels and replaces the first edition from 2007, introduces significant technical revisions including an updated pin hole test (Clause 23) to enhance quality assurance. The standard incorporates the nominal conductor diameters ranging from 0.020 mm up to 1.600 mm, covering two grades for flexibility in different electrical design needs.

Key Topics

• Dual Coating Composition

  • Base coating: Polyurethane resin, which can be chemically modified but must retain its original chemical identity and conform to performance requirements.
  • Superimposed coating: Polyamide resin providing additional mechanical strength and thermal stability.

• Thermal Class 180 Requirements

  • Minimum temperature index: 180 °C.
  • Minimum heat shock temperature: 200 °C.
  • Ensures suitability for high-temperature winding wire applications.

• Dimensional and Electrical Requirements

  • Nominal conductor diameters span from 0.020 mm to 1.600 mm.
  • Adherence to electrical resistance, flexibility, elongation, heat shock, pin hole presence, and solderability standards.

• Testing and Quality Assurance

  • Compliance with test methods as defined in IEC 60317-0-1:2013, with this standard prevailing in case of inconsistencies.
  • Includes tests for abrasion resistance, solvent resistance, breakdown voltage, continuity of insulation, and dielectric dissipation factor among others.
  • Updated pin hole test to detect defects in enamel coating ensuring product reliability.

• Solderability

  • Specific soldering guidelines based on conductor diameter.
  • Critical for applications involving coil windings requiring solder connections without compromising insulation integrity.

Applications

IEC 60317-55 winding wires are primarily used in electrical motors, transformers, inductors, and other electromagnetic devices requiring reliable insulation and enhanced thermal tolerance. The solderable polyurethane enamelled copper wires with polyamide overcoat are ideal for:

• High-temperature motor windings where resistance to thermal degradation is essential.
• Manufacturing of transformers that operate under consistent thermal stress.
• Electrical coils and inductors that require durable wire capable of withstanding mechanical abrasion and solvent exposure.
• Precision electronics where wire solderability must be assured to facilitate assembly without damage.
• Automotive and aerospace electrical equipment requiring components that meet strict thermal and mechanical performance standards.

Related Standards

IEC 60317-55 should be used in conjunction with several related IEC standards to ensure comprehensive compliance and quality:

• IEC 60317-0-1:2013 – General requirements for enamelled round copper wires, providing foundational definitions, test methods, and dimensional specifications.
• IEC 60851 Series – Specifies test methods for electric insulating wires, supporting detailed procedures to verify wire parameters.
• IEC 60264 Series – Covers packaging requirements for winding wires to maintain quality during storage and transport.

Together, these standards serve as a comprehensive framework governing the production, testing, and application of winding wires for demanding electrotechnical environments.

By adhering to IEC 60317-55:2013, manufacturers and engineers ensure the production and use of high-quality, solderable polyurethane enamelled round copper wire overcoated with polyamide that meets critical thermal, electrical, and mechanical performance criteria for robust electrotechnical equipment. This standard supports innovation and safety across multiple industries where winding wire performance is paramount.