IEC 61212-3-2:2013

Overview

IEC 61212-3-2:2013 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the requirements for industrial rigid round laminated moulded tubes used in electrical applications. These tubes are based on thermosetting resins combined with various reinforcements, designed to meet established levels of performance for insulation and mechanical stability.

The standard forms part of the IEC 61212 series, which covers rigid round laminated tubes and rods based on thermosetting resins for electrical purposes. This third edition updates previous versions to reflect technical revisions including changes to the test methods for insulation resistance, ensuring that products adhering to this standard exhibit reliable performance.

Key Topics

• Material Specifications: IEC 61212-3-2 defines the physical and electrical properties of laminated moulded tubes made with different resin and reinforcement combinations such as epoxy (EP) with cotton cloth (CC) or phenolic (PF) resins with cellulosic paper (CP). These materials must meet precise mechanical and electrical criteria.

• Designations: Each type of moulded tube is designated using a combination of abbreviations indicating resin type, reinforcement, and form. For example, EP CC 31 refers to an epoxy resin reinforced with woven cotton cloth, moulded into a tube form.

• Dimensions and Tolerances: The standard includes detailed permissible tolerances for external and internal diameters, wall thickness, and straightness of the tubes, ensuring uniformity and interchangeability in industrial applications.

• Performance Requirements: Electrical properties such as insulation resistance, electric strength at elevated temperatures, and mechanical robustness are specified to guarantee reliable operation in harsh electrical environments.

• Test Methods: Updated testing protocols, especially for insulation resistance after water immersion, provide validated procedures to verify conformity to specifications.

Applications

Industrial rigid round laminated moulded tubes compliant with IEC 61212-3-2 are widely used in electrical engineering and manufacturing, including:

• Electrical Insulation: Providing robust insulation for cables, bushings, switchgear components, and other high-voltage equipment.

• Mechanical Supports: Serving as structural elements in electrical assemblies requiring durable, heat-resistant insulating materials.

• Electrical Machinery: Employed in motors, transformers, and generators where reliable electrical insulation and thermal stability are critical.

• Custom Industrial Components: Used in fabrication of parts where tailored mechanical and electrical properties of laminated moulded tubes are essential.

The selection of moulded tubes for specific applications should be guided by the performance requirements of the end-use environment rather than solely by compliance with the standard.

Related Standards

• IEC 61212-1: Definitions, designations, and general requirements for industrial rigid round laminated tubes and rods based on thermosetting resins.

• IEC 61212-2: Specifies methods of testing for these materials, complementing the material specifications outlined in IEC 61212-3-2.

Together, these standards provide a comprehensive framework for the design, testing, and application of industrial insulating materials made from thermosetting resins.

Keywords: IEC 61212-3-2, industrial rigid round laminated moulded tubes, thermosetting resins, electrical insulation materials, epoxy resin tubes, phenolic tubes, cotton cloth reinforcement, insulation resistance, electric strength, IEC standards for electrical materials, electrical industry tubing