EN 60851-3:2009/A2:2019

Overview

EN 60851-3:2009/A2:2019 is a European standard developed by CLC that specifies test methods for assessing the mechanical properties of winding wires. This amendment A2 updates the original EN 60851-3:2009, maintaining alignment with the IEC 60851-3:2009/A2 international counterpart. The standard plays a critical role in ensuring the reliability, durability, and performance of winding wires used primarily in electrotechnical applications.

As winding wires are fundamental components in electrical devices such as motors, transformers, and inductors, mechanical property testing-such as adherence and heat bonding-is essential to guarantee their quality and suitability for diverse industrial environments.

Key Topics

• Adherence Test Procedures
  This standard outlines detailed procedures to evaluate coating adhesion on various types of winding wires, including:

  • Enamelled rectangular wires
  • Impregnated fibre-covered round and rectangular wires
  • Fibre-covered enamelled wires
  • Tape-wrapped wires with adhesive tape

  Tests involve elongation of wires, followed by microscopic examination (6-10x magnification) to identify and measure any loss of adhesion, which could impact wire insulation and performance.

• Heat Bonding Test for Wire Assemblies
  Applicable to enamelled round wires with conductor diameters from 0.05 mm to 2 mm and rectangular enamelled wires, this test evaluates the strength of heat bonding between overlapping wires.

  • Specimens are clamped under a defined pressure and cured in an oven at 120 ± 2 °C for approximately 24 hours.
  • A lap shear test determines the maximum load before detachment, calculating shearing stress as a quantitative indicator of bonding strength.

• Test Sample Preparation and Conditions
  The standard specifies precise sample dimensions, clamping pressures, temperature profiles, and microscopic examination steps. These detailed methodological instructions ensure consistency and reproducibility across laboratories and manufacturing sites.

Applications

• Quality Control in Winding Wire Manufacturing
  Manufacturers utilize these test methods to verify mechanical properties during production, enabling early detection of defects in insulation adherence or bonding strength.

• Assessment of Electrical Component Reliability
  Since winding wires are crucial in motors, transformers, relays, and inductors, their mechanical integrity impacts overall device lifespan and operational safety.

• Design Verification for Electrical Machines
  Engineers incorporate these standards when specifying winding materials and insulating coatings to meet mechanical robustness requirements under operational stresses such as vibration, thermal cycling, and mechanical elongation.

• Compliance with Electrotechnical Industry Norms
  Compliance with EN 60851-3:2009/A2:2019 aligns with international best practices and regulatory expectations, facilitating market access across European Union countries and beyond.

Related Standards

• EN 60851 Series
  Part 1: General requirements for winding wires
  Part 2: Dimensional, mechanical, and electrical characteristics
  Other parts cover specific properties and test methods relevant to winding wires.

• IEC 60851 Series
  The international versions provide harmonized testing frameworks applicable worldwide, ensuring global consistency in winding wire testing.

• CENELEC Internal Regulations
  Defines the procedures for adoption and implementation of amendments such as A2 as national standards within member countries.

• Standards on Electrical Insulating Materials
  Complementary standards covering insulation properties and thermal characteristics that work in conjunction with mechanical property standards.

Keywords: EN 60851-3:2009/A2:2019, winding wires, mechanical properties, test methods, adherence test, heat bonding, enamelled wire testing, electrical wire insulation, CENELEC standards, electrotechnical components, winding wire quality control, IEC 60851, wire elongation test, lap shear test, mechanical durability of winding wires, electrical machine winding wire standards.