IEC 60317-71:2020

Overview

IEC 60317-71:2020 defines specifications for a particular class of winding wire: polyester glass‑fibre wound, resin- or varnish‑impregnated, bare or enamelled round copper wire with a temperature index 180. This second edition (2020) updates the 2017 edition, revising the title, scope and key material requirements (notably subclause 3.2.2). Nominal conductor diameters refer to IEC 60317-0-10:2017, Clause 4. Important practical note: for this wire type the heat‑shock test is considered inappropriate, so a conventional class combining temperature index and heat‑shock temperature is not specified.

Key topics and technical requirements

• Wire construction
  • Polyester + electrical‑grade continuous‑filament glass yarn fibre covering.
  • Polyester fibre is high‑grade PET (polyethylene terephthalate) from linear polymerization; maximum polyester content by weight ≤ 50% of yarn.
  • Impregnating agents may include epoxy, polyester, or polyesterimide resins.
• Grades and coating options
  • PG1: one layer of polyester glass fibre (or two finer layers meeting dimensional requirements).
  • PG2: two layers of polyester glass fibre.
  • Enamel grades: grade 1 or grade 2 enamel over PG1/PG2 constructions (e.g., grade 1 PG1, grade 2 PG2).
• Temperature and performance
  • Temperature index 180 for enamel and impregnating agents is required or agreed between purchaser and supplier.
  • Heat‑shock and many mechanical/chemical tests (cut‑through, abrasion, solvents, continuity of insulation, etc.) are listed as inappropriate for this wire type in this standard.
• Referenced test methods and clauses
  • Where applicable, requirements and test methods defer to IEC 60317-0-10:2017 and IEC 60851 series (winding wire test methods).
  • Clause 30 (packaging) of IEC 60317-0-10 applies.

Applications and users

• Who uses this standard
  • Manufacturers and suppliers of enamelled and bare copper winding wire.
  • Designers of motors, transformers, inductors, solenoids and other electromagnetic windings requiring high thermal endurance (temperature index 180).
  • Procurement and quality‑assurance teams specifying wire construction, impregnation and thermal properties.
  • Test laboratories and compliance engineers referencing correct test methods and limitations for this wire type.
• Practical value
  • Ensures consistent material composition (polyester/glass balance), impregnation compatibility and thermal index for reliable winding insulation in high‑temperature service.
  • Guides selection of enamel grade and fibre layering (PG1/PG2) for mechanical protection and electrical insulation performance.

Related standards

• IEC 60317-0-10:2017 - General requirements and nominal diameters for polyester glass‑fibre wound wires
• IEC 60851 (all parts) - Winding wires - Test methods
• IEC 60264 (all parts) - Packaging of winding wires

Keywords: IEC 60317-71, polyester glass-fibre wound, winding wire, temperature index 180, enamelled copper wire, resin impregnated, PG1, PG2, winding wire specifications.