IEC 61212-2:2006

Overview

IEC 61212-2:2006 – "Insulating materials - Industrial rigid round laminated tubes and rods based on thermosetting resins for electrical purposes - Part 2: Methods of test" defines the test methods used to assess laminated thermosetting resin tubes and rods intended for electrical applications. It forms Part 2 of the IEC 61212 series and applies to the materials defined in IEC 61212-1. The standard establishes conditioning, dimensional checks, mechanical, electrical and other material tests so manufacturers, test labs and specifiers can verify conformance to performance levels. Note: selection for a specific application should be based on actual application requirements, not on this specification alone.

Key topics

• Scope & safety: Tests apply to industrial rigid round laminated tubes and rods based on thermosetting resins; includes safety and application-use statements and a user responsibility warning.
• Conditioning: Standard atmosphere B (23 °C ±2 K, 50% ±5% RH) for at least 24 hours before most tests; elevated-temperature conditioning where required.
• Dimensions & measurement: Procedures and tolerances for external/internal diameter, wall thickness and straightness using micrometers, vernier calipers or tapes.
• Mechanical tests:
  • Flexural strength perpendicular to laminations
  • Axial compressive strength
  • Cohesion between layers (delamination testing)
• Electrical tests:
  • Electric strength and breakdown voltage (power-frequency methods)
  • Insulation resistance after immersion in water
  • Dissipation factor and permittivity (tube only)
• Other tests:
  • Thermal endurance (ageing procedures and evaluation)
  • Water absorption
  • Density
  • Flammability (50 W flame tests referenced)
• Normative references: Cross-references to IEC and ISO test methods (for example IEC 60243-1, IEC 60216-1/2, IEC 60212, ISO 62, ISO 178, ISO 604).

Applications

• Product qualification and acceptance testing for manufacturers of laminated insulating tubes and rods.
• Quality assurance and incoming inspection in electrical equipment production (rotating machines, switchgear supports, bushings, insulators).
• R&D and materials comparison to evaluate mechanical, electrical and thermal performance of thermosetting laminates.
• Failure analysis and safety verification after exposure to environmental or electrical stresses.

Who should use it

• Manufacturers of insulating tubes/rods and composite laminates
• Independent testing laboratories and certification bodies
• Design and electrical engineers specifying insulating components
• Procurement and QA teams assessing material conformity

Related standards

• IEC 61212-1 (Definitions, designations and general requirements)
• IEC 61212-3 (Material specification sheets)
• Relevant test standards: IEC 60243-1, IEC 60216-1/2, IEC 60212, IEC 60250, ISO 62, ISO 178, ISO 604.

Keywords: IEC 61212-2, insulating materials, laminated tubes, thermosetting resins, methods of test, electrical insulating materials, mechanical tests, electrical tests, thermal endurance.