EN 60464-3-1:2001/A1:2006

Overview

EN 60464-3-1:2001/A1:2006 is the CENELEC amendment to IEC 60464-3-1 covering varnishes used for electrical insulation - specifically Sheet 1: Ambient curing finishing varnishes. This amendment (A1), approved in February 2006, updates the European/IEC specification for ambient‑cure finishing varnishes used as electrical insulating coatings. The document is intended to harmonize material specifications and to set out property values to be agreed between supplier and purchaser where required.

Key topics

The amendment replaces Table 1 and defines the property categories and requirements that manufacturers, purchasers and testing laboratories should address for ambient curing finishing varnishes. Key technical topics include:

• Properties before drying and curing

  • Density
  • Dilution ability
  • Stability in an open vessel
  • Drying and/or curing behavior in thick layers
  • Effect of varnish on enamelled wire
  • pH (for specified varnish types)
  • Volatile organic content (VOC) and water content (where applicable)

• Properties after curing

  • Mechanical tests (bend test, cupping test)
  • Resistance to liquids (including water)
  • Electrical properties (dissipation factor, relative permittivity, breakdown voltage, electric strength)
  • Resistance to mould growth
  • Flash rusting of steel panels

• Contractual specification

  • Emphasis on values to be agreed between supplier and purchaser - the standard lists which properties should be specified and confirmed in procurement documents.

Applications

This standard is directly applicable to organizations involved in the production, selection and testing of electrical insulating varnishes:

• Varnish and coating manufacturers formulating ambient curing finishing varnishes
• OEMs and contract manufacturers of motors, transformers, coils and electrical apparatus that require protective insulating coatings
• Quality assurance and testing laboratories performing property verification and acceptance testing
• Procurement and specification engineers who must define material acceptance criteria in purchase orders and technical contracts
• Rewinders and repair workshops specifying varnishes for refurbishment of electrical equipment

Related standards and context

• Part of the IEC/EN series on electrical insulating materials (IEC 60464). This amendment is aligned with IEC 60464-3-1:2001 and was adopted by CENELEC as EN 60464-3-1/A1.
• Implementation and withdrawal dates set by CENELEC (approved 2006‑02‑01; national implementation deadlines referenced in the amendment).

This standard is essential for ensuring consistent, agreed‑upon performance criteria for ambient curing finishing varnishes used in electrical insulation applications and for clarifying supplier–purchaser responsibilities when specifying varnish properties.