Overview
IEC 60684-3-247:2011 is an international standard developed by the International Electrotechnical Commission (IEC) that outlines specifications for flexible insulating sleeving, particularly heat-shrinkable, polyolefin sleeving with a dual wall, not flame retarded, and available in both thick and medium wall options. This standard is relevant for manufacturers, suppliers, and users seeking high-quality non-flame-retardant insulating solutions for electrical applications requiring thermal and mechanical protection.
The sleeving types covered under this standard offer a nominal shrink ratio of 3:1, making them suitable for various cable sizes and configurations. Typical applications are designed to operate at temperatures of up to 100 °C, supporting both medium wall (Type A) and thick wall (Type B) sleeving options, each with internal diameters up to 200 mm.
Key Topics
- Types of Sleeving:
- Type A (Medium Wall): For applications demanding moderate mechanical protection, with an emphasis on flexibility.
- Type B (Thick Wall): Provides greater impact and abrasion resistance, ideal for more rigorous environments.
- Material Characteristics:
- Constructed from polyolefin materials in a dual wall format, combining strength with insulating qualities.
- Not flame retarded, focusing on electrical insulation and environmental protection.
- Typically supplied in black, but customizable based on user-supplier agreement.
- Shrink Ratio:
- All products feature a 3:1 shrink ratio, enabling effective coverage over varying cable diameters.
- Performance Standards:
- Suitable for continuous operation at temperatures up to 100 °C.
- Performance requirements include dimensions, tensile strength, elongation at break, breakdown voltage, chemical resistance, and environmental durability.
- Test Methods:
- Performance verified through standardized testing procedures as detailed in IEC 60684-2, including tests for physical, electrical, and chemical properties.
Applications
The heat-shrinkable dual wall polyolefin sleeving specified in IEC 60684-3-247:2011 is widely used in various electrical and electronics industries for:
- Cable and Wire Insulation:
- Providing electrical insulation and mechanical protection for cable joints, terminations, and repairs.
- Protective Covering:
- Guarding against moisture ingress, pollutants, and mechanical damage in harsh industrial environments.
- Bundling and Strain Relief:
- Organizing and securing groups of wires or cables within control panels, automotive assemblies, or transport vehicles.
- Medium and Heavy-Duty Applications:
- Type B (thick wall) sleeves are particularly valued in energy, transport, and utility sectors where robust protection is necessary.
- Custom Installations:
- Thanks to the wide range of available sizes (internal diameters up to 200 mm), this sleeving is applicable to both standard and unique installations requiring tailored solutions.
Related Standards
For comprehensive use and reference, the following related IEC standards are significant:
- IEC 60684-1: Flexible insulating sleeving – Definitions and general requirements
- IEC 60684-2: Flexible insulating sleeving – Methods of test
- IEC 60502-1: Power cables with extruded insulation and their accessories for rated voltages from 1 kV up to 30 kV
- IEC 60296: Fluids for electrotechnical applications – Unused mineral insulating oils for transformers and switchgear
- IEC 60757: Code for designation of colours
- ISO 846: Plastics – Evaluation of the action of micro-organisms
- ISO 868: Plastics and ebonite – Determination of indentation hardness by means of a durometer (Shore hardness)
Practical Value
Adopting IEC 60684-3-247:2011 ensures that users benefit from an internationally recognized baseline of performance and safety for non-flame-retarded, heat-shrinkable polyolefin sleeving. This standard supports reliable electrical insulation, mechanical protection, and longevity in demanding operational settings, making it a essential reference for electrical engineers, designers, and quality assurance professionals specifying cable sleeving solutions.