IEC 60317-20:2013

Overview

IEC 60317-20:2013 is an international standard published by the International Electrotechnical Commission (IEC), specifying requirements for solderable polyurethane enamelled round copper winding wire, classified under thermal class 155. This standard applies to winding wires with a single polyurethane resin-based enamel coating, including certain modified resins that retain the original chemical identity and conform to all requirements. It covers two grades of nominal conductor diameters: Grade 1 (0.018 mm to 0.800 mm) and Grade 2 (0.020 mm to 0.800 mm).

This third edition supersedes the second edition and its amendments, incorporating several technical revisions to enhance clarity and testing protocols. The standard is part of the broader IEC 60317 series which details specifications for various types of winding wires used in electrical and electronic equipment.

Key Topics

• Material and Coating
  The wire is made of round copper conductors enamelled with a polyurethane resin coating. The standard allows modified polyurethane resin coatings, provided their chemical identity remains consistent with the original and all electrical, mechanical, and thermal properties meet specified requirements.

• Thermal Class 155
  Indicates a minimum temperature index of 155°C with a heat shock resistance of at least 175°C, suitable for high-temperature electrical applications.

• Grades and Dimensions

  • Grade 1: nominal conductor diameters from 0.018 mm up to 0.800 mm
  • Grade 2: nominal conductor diameters from 0.020 mm up to 0.800 mm
    Nominal diameters adhere to specifications outlined in IEC 60317-0-1:2013.

• Testing and Performance Requirements
  The standard outlines comprehensive tests including:

  • Electrical resistance
  • Elongation and flexibility
  • Heat shock resistance
  • Resistance to abrasion and solvents
  • Breakdown voltage
  • Continuity of insulation
  • Solderability tests consolidated for all nominal diameters
  • Dielectric dissipation factor
  • Resistance to transformer oil
  • Pin hole tests for insulation integrity

• Packaging
  The standard references packaging requirements detailed within the IEC 60264 series, ensuring protective and industry-compliant packaging of winding wires.

Applications

IEC 60317-20 solderable polyurethane enamelled copper wires are essential components in electrical and electronic devices requiring reliable winding wires capable of withstanding elevated temperature conditions. Typical applications include:

• Electric Motors and Transformers
  The wires are suited for winding coils and components exposed to continuous thermal stress during operation, ensuring durability and electrical insulation integrity.

• Electromechanical Equipment
  Used in solenoids, electromagnets, and relays where solderable enamelled wire facilitates efficient assembly and soldered connections.

• Electronic Components
  Ideal for devices requiring fine wire diameters with high mechanical flexibility and strong solvent and abrasion resistance.

• High-Temperature Electrical Insulation
  Its classification supports use in environments with thermal demands up to 155°C, ensuring long-term performance and safety.

Related Standards

• IEC 60317 Series
  This series elaborates on specifications for different types of winding wires with various insulation types and performance classes.

• IEC 60317-0-1:2013
  Provides general requirements, terms, and dimension specifications for enamelled round copper wires applicable to IEC 60317-20.

• IEC 60851
  Covers test methods applicable to winding wires, complementing the performance assessments in IEC 60317-20.

• IEC 60264
  Addresses packaging requirements, reinforcing proper handling and supply chain standards for winding wires.

Summary

IEC 60317-20:2013 establishes stringent and clear requirements for solderable polyurethane enamelled round copper wires used in electrotechnical windings, ensuring wires meet thermal class 155 criteria with reliable solderability and insulation properties. Compliance with this standard guarantees performance consistency for manufacturers and end-users, supporting high-temperature electrical applications with confidence. This standard is integral for designers, engineers, and quality control specialists in the winding wire and electrical equipment industries seeking internationally recognized specifications and testing procedures.