IEC 60684-3-280:2019

Overview

IEC 60684-3-280:2019 specifies the requirements for heat-shrinkable, polyolefin sleeving, anti-tracking, intended for electrical insulation applications. This standard is part of the IEC 60684 series, focusing on flexible insulating sleevings used in electrical systems. The sleeving covered in this sheet features a nominal shrink ratio of 3:1, is typically of medium wall thickness, and supports internal diameters up to 110 mm. Resistant to tracking, the sleeving is proven for use at continuous operating temperatures up to 100 °C and is generally available in red or brown.

This international standard assists manufacturers, system designers, and users in ensuring effective electrical insulation and safety, specifically in medium voltage cable accessories. The standard outlines performance criteria, test methods, available size ranges, and guidance for determining user-supplier agreements regarding product specifications.

Key Topics

• Heat-Shrinkable Polyolefin Sleeving: Detailed requirements and tolerances for insulation sleeving that shrinks upon heating, ensuring a tight fit and robust insulation.
• Anti-Tracking Properties: Requirements for resistance to electrical tracking to enhance safe functioning in medium-voltage environments.
• Material and Performance: Guidance on selection, based on performance at temperatures up to 100 °C and various wall thicknesses and diameters.
• Testing Protocols: Testing involves shrinking the sleeving in a forced air oven and assessing properties such as tensile strength, elongation, dielectric strength, resistance to fluids, weathering, and tracking.
• Designation and Labelling: Standardized identification for product labelling, including publication number, size, and color coding per IEC 60757.
• User-Supplier Agreements: Flexibility for users and suppliers to agree on specific dimensions and properties, accommodating a wide application range.
• Conformance Requirements: Emphasis on verifying the product's conformity with established standards through testing on typical sizes.

Applications

The IEC 60684-3-280 standard is directly applicable in industries requiring electrical insulation for medium-voltage power cables and accessories. Common applications include:

• Medium Voltage Cable Accessories: Essential for providing electrical insulation and mechanical protection in joints, terminations, and repairs.
• Industrial Electrical Installations: Used where heat-shrinkable tubing must withstand environmental exposure and mechanical stresses.
• Electric Power Distribution: Ensures long-term reliability in switchgear and transformer connections.
• Harsh Environment Installations: Anti-tracking properties help in outdoor or high-humidity locations, reducing the risk of surface electrical tracking and failure.
• Retrofitting and Maintenance: Facilitates repairs and upgrades by enabling secure insulation restoration over a range of cable sizes and geometries.

The selection of the appropriate sleeving type and size should be based on the specific application's performance and environmental requirements, in consultation with suppliers and referencing the available size guidance in Annex A of the standard.

Related Standards

Several related standards provide further guidance and test methods complementing IEC 60684-3-280:

• IEC 60684-1: Definitions and general requirements for flexible insulating sleeving.
• IEC 60684-2: Test methods applicable to flexible insulating sleeving.
• HD 629.1: Test requirements for accessories used on medium voltage cables with extruded insulation.
• IEC 60502 (all parts): Power cables with extruded insulation and their accessories for voltages from 1 kV to 30 kV.
• IEC 60296: Mineral insulating oils for electrotechnical applications (referenced in fluid resistance testing).
• IEC 60757: Codes for color designation, ensuring uniform product labeling.
• ISO 846/ISO 4892-3: Plastics - Actions of micro-organisms, and methods of exposure to UV light, respectively (referenced in durability and aging tests).

These interconnected standards help ensure a comprehensive approach to safety, performance, and reliability in electrical insulation systems utilizing heat-shrinkable, anti-tracking polyolefin sleeving.

Keywords: Heat-shrinkable sleeving, polyolefin insulating tubing, anti-tracking, IEC 60684-3-280, electrical insulation standard, medium voltage cable accessories, electrical safety, cable protection.