IEC 60317-59:2015

Overview

IEC 60317-59:2015 (with Amendment 1:2024) defines requirements for polyamide‑imide enamelled round copper winding wire, class 240. This part of the IEC 60317 series covers enamelled round copper wire with a single coating of polyamide‑imide resin and is intended for insulated wires used for windings where elevated thermal performance is required. It is to be read in conjunction with IEC 60317-0-1:2013 (general requirements for enamelled round copper wire).

Key topics and technical requirements

• Wire type and coating: Single coating of polyamide‑imide resin on round copper conductor.
• Thermal class: Class 240 - minimum temperature index 240°C; minimum heat‑shock temperature 260°C.
• Conductor diameters: Covers nominal diameters for both Grade 1 and Grade 2 from 0.180 mm up to and including 1.600 mm (nominal diameters are specified in IEC 60317-0-1:2013).
• Mechanical and electrical tests: Requirements reference the general test methods in IEC 60317-0-1 and IEC 60851 series. Specifics in IEC 60317-59 include:
  • Cut‑through: no failure within 2 minutes at 450°C.
  • Flexibility/adherence: Peel test uses constant K = 75 mm for revolution calculations.
  • Breakdown voltage: Measured with elevated temperature set to 240°C.
  • Resistance to abrasion: Detailed minimum average and per‑measurement forces for Grades 1 and 2 are given in Table 1 (applies to diameters 0.250–1.600 mm; intermediate sizes use the next larger diameter values).
• Tests declared inappropriate or without requirements: solderability, heat/solvent bonding, dielectric dissipation factor; some refrigerant, oil and mass‑loss tests are marked “appropriate but no requirements specified” or “inappropriate” as noted in the document.
• Packaging and appearance: Packaging and appearance requirements reference IEC 60317-0-1 and IEC 60264 series.

Applications and users

Who uses IEC 60317-59:

• Winding wire manufacturers specifying and certifying enamelled round copper winding wire of class 240.
• Motor, transformer and generator designers selecting insulated wires for high‑temperature winding applications.
• Quality assurance, test laboratories and procurement teams verifying conformance to thermal and mechanical performance criteria.
• Industries requiring high thermal stability in windings: industrial drives, power electronics, aerospace, automotive and specialized electrical equipment.

Why it matters:

• Ensures consistent performance at elevated temperatures, reliable insulation integrity under thermal stress, and repeatable mechanical robustness (abrasion, cut‑through, flexibility) for critical winding applications.

Related standards

• IEC 60317-0-1:2013 (+AMD1:2019) - General requirements for enamelled round copper wire (normative reference).
• IEC 60851 series - Test methods for winding wires.
• IEC 60264 series - Packaging of winding wires.