IEC 60317-74:2018

Overview

IEC 60317-74:2018 (consolidated with AMD1:2024) specifies requirements for polyesterimide enamelled rectangular aluminium wire, class 180 - a type of insulated wires used for windings. The standard covers rectangular aluminium conductors with a single (sole) polyesterimide-based enamel coating. Modified polyesterimide formulations are permitted provided the chemical identity is retained and all wire requirements are met. Wires of grade 1 and grade 2 are included.

Key dimensional limits:

• Width: 2.0 mm to 16.0 mm
• Thickness: 0.80 mm to 5.60 mm

IEC 60317-74 is intended to be used together with IEC 60317-0-9:2015 (general requirements for enamelled rectangular aluminium wire) and references IEC test-methods series (IEC 60851).

Key topics and requirements

The standard defines technical requirements and references for testing, including:

• Thermal class: Class 180 - minimum temperature index 180 °C.
• Heat shock: Minimum heat shock temperature 200 °C.
• Electrical and mechanical properties: Dimensions, electrical resistance, elongation, flexibility, adherence and continuity as referenced from IEC 60317-0-9.
• Dielectric and insulation tests: Breakdown voltage requirements (elevated temperature test at 180 °C) and other insulation checks as applicable.
• Scope of tests: Several tests are declared inappropriate for this wire type (e.g., cut-through, some abrasion and solderability tests), while other tests are under consideration (e.g., dielectric dissipation factor, resistance to transformer oil).
• Packaging: Packaging requirements refer back to IEC 60317-0-9 and IEC 60264 series.

Note: Where IEC 60317-0-9 and IEC 60317-74 conflict, the specific provisions of IEC 60317-74 take precedence.

Applications and who uses this standard

IEC 60317-74 applies where rectangular aluminium enamelled wire is specified for windings in electrical equipment. Typical applications:

• Low- to medium-voltage transformers, inductors and chokes
• Electric motors and generators where aluminium rectangular conductors are chosen for form factor or weight advantages
• Custom coils and wound components with thermal-class 180 requirements

Primary users:

• Wire and enamel manufacturers (product specification & quality control)
• Motor, transformer and coil designers (material selection)
• Test laboratories and conformity assessors (type and production testing)
• Procurement and standards compliance teams

Related standards

• IEC 60317-0-9:2015 (+AMD1:2024) - General requirements for enamelled rectangular aluminium wire
• IEC 60851 series - Winding wires - Test methods
• IEC 60264 series - Packaging of winding wires

Keywords: IEC 60317-74:2018, polyesterimide enamelled rectangular aluminium wire, class 180, insulated wires used for windings, aluminium winding wire, temperature index 180.