Overview

IEC 60317-73:2018 (with Amendment 1:2024) specifies enamelled rectangular aluminium winding wire, class 200, with a dual-coating system: an underlying polyester or polyesterimide resin and a superimposed polyamide‑imide enamel. This part of the IEC 60317 series defines material, dimensional and performance requirements for insulated wires used for windings in electrical equipment, covering nominal conductor widths from 2.0 mm to 16.0 mm and thicknesses from 0.80 mm to 5.60 mm. Both grade 1 and grade 2 wires are included.

Key topics and requirements

Dual-coating chemistry: Base coat based on polyester or polyesterimide (modifications allowed if chemical identity is retained); top coat based on polyamide‑imide.
Thermal class: Class 200 requires a minimum temperature index of 200 °C and a heat shock temperature ≥ 220 °C.
Dimensional range: Width 2.0–16.0 mm; thickness 0.80–5.60 mm. Specific width/thickness combinations and ratios are referenced to IEC 60317-0-9:2015.
Performance testing: Many tests and criteria are applied via IEC 60317-0-9 and IEC 60851 test methods (electrical resistance, elongation, flexibility and adherence, breakdown voltage at elevated temperature, etc.). Several tests are declared inappropriate for this wire type (for instance cut‑through, resistance to abrasion, some bonding or solderability tests). Some tests (dielectric dissipation factor, resistance to transformer oil) are under consideration.
Grades and applicability: Requirements apply across the full range of conductor sizes for grade 1 and grade 2 classifications.
Packaging: Packaging provisions follow IEC 60317-0-9 and relevant packaging standards (IEC 60264 series).

Applications

IEC 60317-73 targets insulated wires used for windings where a rectangular aluminium conductor with high thermal performance and robust enamel insulation is required. Typical applications include:

Power transformers and distribution transformers where aluminium rectangular conductors are preferred for packing efficiency.
Large motors, generator windings, and reactors requiring precise conductor dimensions and class 200 thermal performance.
Industrial electromagnetic coils and winding assemblies where thermal endurance and solvent/chemical resistance from polyamide‑imide coatings are beneficial.

Who uses this standard

Winding wire manufacturers and enamel formulators specifying product formulations and dimensional limits.
Electrical equipment designers and OEMs specifying winding materials for thermal class 200 applications.
Test labs and quality assurance teams verifying compliance to IEC winding‑wire specifications.
Procurement and certification bodies assessing supplier conformance.

Related standards

IEC 60317-0-9:2015 (general requirements for enamelled rectangular aluminium wire)
IEC 60851 series (winding wires - test methods)
IEC 60264 series (packaging of winding wires)

Keywords: IEC 60317-73, enamelled rectangular aluminium wire, polyesterimide, polyamide‑imide, class 200, insulated wires used for windings, winding wire standard.

Overview

Key topics and requirements

Dual-coating chemistry: Base coat based on polyester or polyesterimide (modifications allowed if chemical identity is retained); top coat based on polyamide‑imide.
Thermal class: Class 200 requires a minimum temperature index of 200 °C and a heat shock temperature ≥ 220 °C.
Dimensional range: Width 2.0–16.0 mm; thickness 0.80–5.60 mm. Specific width/thickness combinations and ratios are referenced to IEC 60317-0-9:2015.
Performance testing: Many tests and criteria are applied via IEC 60317-0-9 and IEC 60851 test methods (electrical resistance, elongation, flexibility and adherence, breakdown voltage at elevated temperature, etc.). Several tests are declared inappropriate for this wire type (for instance cut‑through, resistance to abrasion, some bonding or solderability tests). Some tests (dielectric dissipation factor, resistance to transformer oil) are under consideration.
Grades and applicability: Requirements apply across the full range of conductor sizes for grade 1 and grade 2 classifications.
Packaging: Packaging provisions follow IEC 60317-0-9 and relevant packaging standards (IEC 60264 series).

Applications

Power transformers and distribution transformers where aluminium rectangular conductors are preferred for packing efficiency.
Large motors, generator windings, and reactors requiring precise conductor dimensions and class 200 thermal performance.
Industrial electromagnetic coils and winding assemblies where thermal endurance and solvent/chemical resistance from polyamide‑imide coatings are beneficial.

Who uses this standard

Winding wire manufacturers and enamel formulators specifying product formulations and dimensional limits.
Electrical equipment designers and OEMs specifying winding materials for thermal class 200 applications.
Test labs and quality assurance teams verifying compliance to IEC winding‑wire specifications.
Procurement and certification bodies assessing supplier conformance.

Related standards

IEC 60317-0-9:2015 (general requirements for enamelled rectangular aluminium wire)
IEC 60851 series (winding wires - test methods)
IEC 60264 series (packaging of winding wires)

Keywords: IEC 60317-73, enamelled rectangular aluminium wire, polyesterimide, polyamide‑imide, class 200, insulated wires used for windings, winding wire standard.

IEC 60317-73:2018 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications

Who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications

Who uses this standard

Related standards

Related standards

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