IEC 60317-17:2020

Overview

IEC 60317-17:2020 specifies requirements for polyvinyl acetal enamelled rectangular copper wire, class 105 - a type of insulated winding wire used in electrical equipment windings. This fourth edition (2020) defines material, dimensional and performance requirements for rectangular copper conductors with a sole polyvinyl acetal-based enamel coating (modifications to the resin are permitted provided the chemical identity is retained and all wire requirements are met). The standard applies to wires of thermal class 105 (minimum temperature index 105, minimum heat-shock temperature 155 °C) and includes grade 1 and grade 2 wires across the defined conductor size range.

Key topics and technical requirements

• Material and coating: Sole coating based on polyvinyl acetal resin (modifications allowed when chemical identity is maintained).
• Thermal class: Class 105 - minimum temperature index 105 and heat shock ≥ 155 °C.
• Conductor dimensions: Nominal width from 2.0 mm to 31.5 mm and thickness from 0.80 mm to 10.00 mm (see Clause 1 for full details and applicable combinations per IEC 60317-0-2).
• Mechanical tests:
  • Mandrel winding test (Clause 8.1): coating must show no cracking when bent flatwise and edgewise on specified mandrel diameters.
  • Adherence test (formerly stretching test, Clause 8.2): wire is stretched by 20% or until break; loss of adhesion is limited by the standard.
  • Other mechanical attributes referenced: elongation, springiness and flexibility (see Clauses 5–7 and 8).
• Electrical and thermal tests:
  • Electrical resistance, breakdown voltage (measured at elevated temperature 105 °C), temperature index determination, heat shock testing.
• Tests marked inappropriate or under consideration: some tests in the generic part are not applicable for this wire (e.g., cut-through, certain abrasion tests, solderability, refrigerant resistance); see the standard for specifics.
• Packaging and documentation: packaging requirements and normative references (IEC 60317-0-2 and IEC 60851 series) are included.

Applications and who uses this standard

IEC 60317-17:2020 is used by:

• Winding wire manufacturers specifying material, dimensions and test criteria for polyvinyl acetal enamelled rectangular copper wire.
• Motor, transformer and coil designers and electrical equipment OEMs selecting rectangular enamelled wire for windings where thermal class 105 performance is required.
• Quality control and test laboratories implementing the mandated mechanical, electrical and thermal tests.
• Procurement and specification engineers preparing technical specifications and purchase orders.

Typical applications include windings in motors, transformers, chokes, solenoids and other electromagnetic devices where space-efficient rectangular conductors and class 105 thermal performance are needed.

Related standards

• IEC 60317 series - Specifications for particular types of winding wires
• IEC 60317-0-2:2020 - General requirements, enamelled rectangular copper wire
• IEC 60851 series - Methods of test for winding wires
• IEC 60264 series - Packaging of winding wires

For full test methods, exact dimensional tables and clause-level limits, consult the official IEC 60317-17:2020 publication.