Overview
IEC TR 61328:2024 is a technical report developed by the International Electrotechnical Commission (IEC) that provides comprehensive guidelines for the installation of transmission and distribution line conductors and earth wires, with a specific focus on stringing equipment and accessory items. The standard serves as a reference for the selection, application, and maintenance of conductor stringing, earthing, and bonding equipment used with bare and insulated overhead distribution conductors, overhead transmission conductors, and overhead earth wires.
This document addresses practical considerations for live working, offering state-of-the-art methods for managing electric and mechanical hazards encountered during stringing operations. It emphasizes best practices for ensuring safety and reliability by detailing procedures, definitions, and specialized equipment involved in the installation and maintenance of overhead lines.
Key Topics
- Selection of Stringing Equipment: Recommendations for selecting stringing equipment such as tensioners, pullers, reel winders, stringing blocks, and rollers for safe and efficient installation.
- Earthing and Bonding: Guidance on earthing and bonding systems to minimize electrical hazards, including the use of portable earthing devices and proper earth mat installations.
- Procedures for Installation and Maintenance: Step-by-step methods for stringing, sagging, clipping-in, dead-ending, splicing, and maintenance of overhead conductors and earth wires.
- Understanding Electrical Hazards: Explanation of risks associated with electric and magnetic field induction, accidental energization, and lightning, along with effective mitigation techniques.
- Mechanical Hazards: Identification and management of mechanical risks, including equipment handling under load, working at height, and the potential for the unexpected failure of pulling line components.
- Special Earthing Applications: Practical instructions for specific earthing scenarios, such as mid-span joining, installation of jumper loops, and use of earth rods and running earths.
Applications
IEC TR 61328:2024 is applicable across the electrical utility industry and other organizations responsible for the design, construction, and maintenance of overhead power lines. Its guidance is particularly valuable for:
- Utility Companies: Assisting operators and engineers in selecting and using appropriate equipment and earthing methods to enhance the safety of live working environments.
- Contractors and Line Installers: Providing structured, step-by-step procedures for installing and maintaining transmission and distribution line conductors and earth wires, reducing the risk of electrical incidents.
- Safety and Compliance Officers: Offering insights into regulatory considerations for live working, including proper grounding and bonding, as well as emergency readiness for hazards such as induction and lightning.
- Training and Workforce Development: Serving as a technical resource for training line workers on hazard recognition, safe handling of stringing equipment, and emergency procedures during live working operations.
Related Standards
For comprehensive application and compliance, IEC TR 61328:2024 should be used in conjunction with several related standards:
- IEC 60050-466 & IEC 60050-651: International Electrotechnical Vocabulary covering overhead lines and live working terms and definitions.
- IEC 60743: Live working terminology for tools, devices, and equipment, supporting correct implementation of procedures and device selection.
- Other Regional Standards: As IEC TR 61328 is a technical report, users should also consider national or regional standards and regulations that may specify additional or more stringent requirements for stringing equipment and live working on overhead lines.
By following the guidelines provided in IEC TR 61328:2024, organizations can improve operational safety, reduce electrical hazards, and promote effective installation and maintenance practices for transmission and distribution line conductors and earth wires. These best practices help ensure the reliability and continuity of power supply systems around the world.