IEC 60317-2:2019

Overview

IEC 60317-2:2019 defines requirements for solderable polyurethane enamelled round copper winding wire, class 130, with a bonding layer. This fifth edition (2019) is a technical revision of the 2012 edition and applies to dual-coated round copper wires where the underlying enamel is polyurethane (possibly modified) and the outer layer is a thermoplastic bonding resin. The standard covers nominal conductor diameters for Grade 1B and Grade 2B from 0.020 mm up to and including 2.000 mm and is intended for insulated wires used for windings in electrical equipment.

Key Topics and Requirements

• Coating system: dual coating - polyurethane-based enamel (may be modified but must retain chemical identity) plus a thermoplastic bonding layer.
• Thermal class: Class 130 - minimum temperature index 130 and minimum heat shock temperature 155 °C.
• Conductor size range: Grade 1B & 2B - 0.020 mm to 2.000 mm (nominal diameters per IEC 60317-0-1).
• Mechanical and electrical tests referenced or specified: dimensions, electrical resistance, elongation, springiness, flexibility and adherence (peel test constant K = 150 mm), heat shock, cut-through (no failure within 2 min at 170 °C), breakdown voltage (elevated temperature 130 °C), continuity of insulation, dielectric dissipation, resistance to transformer oil, loss of mass, and packaging.
• Abrasion and bonding: resistance to abrasion requirements for diameters from 0.250 mm to 2.000 mm (values in Table 1); heat and solvent bonding tests including heat-bonding strength for helical and twisted coils.
• Solderability and pinholes: solderability requirements depend on conductor diameter ranges; pin hole testing per IEC 60317-0-1:2013 is included.
• Edits in 2019 edition: addition of heat bonding test loads for diameters ≤ 0.050 mm and addition of pin hole test requirements.

Applications and Users

• Practical uses: specification and quality control of insulated wires used for windings in motors, transformers, inductors, relays, solenoids and other electromagnetic devices where solderability and thermal stability (class 130) are required.
• Who uses it: wire manufacturers, winding wire quality engineers, motor and transformer designers, procurement specialists, test laboratories, and certification bodies that need to verify compliance with international winding-wire requirements.

Related Standards

• IEC 60317 series - other particular winding wire specifications.
• IEC 60317-0-1:2013 - general requirements for enamelled round copper wire (normative reference).
• IEC 60851 series - test methods for winding wires.
• IEC 60264 series - packaging of winding wires.

This standard is essential when selecting or specifying solderable polyurethane enamelled round copper wire for electrical windings where consistent thermal, mechanical and soldering performance must be demonstrated.