IEC 60317-21:2013

Overview

IEC 60317-21:2013 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 155. This standard defines particular specifications for dual-coated winding wires used predominantly in electrical and electronic devices requiring reliability and high-performance insulation.

This edition (third edition) revises previous versions with important updates like the consolidation of solderability requirements, introduction of a pin hole test, and clarification of normative references. It covers copper wire diameters ranging from 0.050 mm to 1.600 mm under two grades, ensuring applicability across a broad range of winding wire needs.

Key Topics

• Dual Coating System
  The wire features a dual coating:

  • An underlying coating based on polyurethane resin, modifiable but retaining its chemical identity and performance characteristics.
  • A superimposed polyamide resin coating providing enhanced mechanical and chemical protection.

• Wire Specifications
  Covers solderable round copper wires with diameters between 0.050 mm and 1.600 mm, accommodating Grades 1 and 2 for various industrial applications.

• Electrical and Mechanical Requirements
  Includes detailed requirements for:

  • Electrical resistance
  • Elongation and flexibility
  • Heat shock resistance
  • Abrasion and solvent resistance
  • Dielectric properties such as breakdown voltage and dielectric dissipation factor
  • Continuity of insulation and temperature index

• Solderability and Durability Tests
  Consolidates solderability test clauses to ensure reliable soldering performance. Introduces tests like the pin hole test to verify insulation integrity, improving quality assurance.

• Packaging and Normative References
  Provides guidelines for wire packaging to maintain quality during transport and storage. Normative references ensure harmonization with related IEC standards like IEC 60317-0-1:2013 which details nominal conductor diameters.

Applications

IEC 60317-21:2013 specifies solderable polyurethane enamelled round copper wires with polyamide overcoats, making it highly suitable for:

• Electric Motor Windings: Ensuring thermal class 155 insulation for motors operating at elevated temperatures while allowing reliable solder connections.
• Transformers and Inductors: High mechanical and chemical resistance coatings enable durability in harsh operating environments.
• Precision Electronic Components: Thin gauges and fine diameters cater to compact, high-density winding assemblies requiring excellent electrical insulation and solderability.
• Appliance Manufacturing: Standardization enables interchangeability and quality assurance in production lines across international markets.

The standard's dual coating and testing requirements ensure these wires maintain optimal performance in high-temperature and mechanically demanding electrical components.

Related Standards

• IEC 60317 Series: This part 21 is one in a comprehensive series covering different winding wire types and specifications for various insulation materials and applications.
• IEC 60317-0-1:2013: Defines nominal conductor diameters referenced normatively in this standard.
• IEC 60851: Covers test methods for winding wires, supporting the quality assessment processes outlined in IEC 60317-21.
• IEC 60264: Addresses packaging for winding wires, complementing the packaging requirements specified here.

Adherence to these related standards ensures harmonized specifications, testing, and compatibility within electrical wire manufacturing and application processes.

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