Product Overview

Summary: This Transmission Line Maintenance Safe Operating Procedure provides a clear, step-by-step framework for safely inspecting, maintaining, and repairing overhead transmission assets in the Australian energy network. It focuses on controlling high-risk electrical, working-at-heights, and environmental hazards while keeping crews productive and compliant with WHS and electrical safety legislation.

Transmission line maintenance is one of the highest-risk activities in the electricity supply industry, combining high-voltage exposure, remote locations, helicopter or EWP access, and work at significant heights. This Safe Operating Procedure provides a structured, defensible method for planning and carrying out routine inspections, condition assessments, corrective works, and emergency repairs on overhead transmission lines and associated assets. It guides workers from pre-job planning and isolation through to field execution, testing, and reinstatement of supply, with a strong emphasis on risk assessment, permit-to-work systems, and communication with network control.

Developed for Australian conditions, this SOP aligns with WHS duties, electrical safety legislation, and industry best practice for the power transmission sector. It helps organisations standardise maintenance practices across multiple depots and contractors, reduce the likelihood of electrical incidents, dropped objects, and environmental harm, and demonstrate due diligence in the event of an audit or incident investigation. By implementing this procedure, businesses can better manage ageing assets, minimise unplanned outages, and protect line crews, the public, and critical infrastructure from foreseeable harm.

Key Benefits

• Ensure consistent, safe work practices for all transmission line maintenance tasks across crews and contractors.
• Reduce the risk of electric shock, arc flash, falls from height, and dropped object incidents during line work.
• Streamline planning, permitting, and communication with network control to minimise outages and rework.
• Demonstrate compliance with WHS and electrical safety obligations, supporting audits and incident investigations.
• Improve asset reliability through structured inspection, defect recording, and prioritised corrective maintenance.

Who is this for?

• Transmission Line Workers
• Live Line Workers
• Line Patrol Inspectors
• Field Services Technicians
• Network Operations Managers
• WHS Managers and Advisors
• Electrical Engineers (Power Systems)
• Construction and Maintenance Supervisors
• Contractor Managers for Transmission Projects
• Asset and Reliability Engineers

Hazards Addressed

• Contact with live high-voltage conductors and equipment
• Induced voltages and step/touch potentials
• Arc flash and arc blast during switching or fault conditions
• Falls from height from towers, poles, EWPs and ladders
• Dropped tools and components from elevated work areas
• Vehicle and plant incidents in easements and access tracks
• Struck-by hazards from conductor movement or tensioning equipment
• Adverse weather exposure including lightning, high winds and extreme heat
• Fatigue due to remote work, long shifts and emergency call-outs
• Manual handling injuries when lifting hardware, insulators and equipment
• Wildlife, vegetation and environmental hazards in easements
• Helicopter and UAV (drone) interaction hazards during aerial inspections

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Abbreviations
• 3.0 Roles, Responsibilities and Competency Requirements
• 4.0 Applicable Legislation, Standards and References
• 5.0 Pre-Work Planning and Risk Assessment
• 6.0 Network Coordination, Permits and Isolation Procedures
• 7.0 Access, Site Establishment and Traffic Management
• 8.0 Required Tools, Equipment and PPE
• 9.0 Working at Heights on Towers, Poles and EWPs
• 10.0 Live Line and Proximity Work Controls (if applicable)
• 11.0 Routine Patrols and Detailed Condition Inspections
• 12.0 Maintenance and Repair Activities (Conductors, Insulators, Hardware, Structures)
• 13.0 Use of Helicopters, Drones and Specialised Access Methods
• 14.0 Environmental Management and Vegetation Interface Controls
• 15.0 Communication Protocols with Network Control and Work Groups
• 16.0 Emergency Response, Rescue and Incident Reporting
• 17.0 Post-Work Testing, Re-energisation and Handover
• 18.0 Documentation, Records Management and Defect Reporting
• 19.0 Training, Competency Verification and Review of Procedure

Legislation & References

• Work Health and Safety Act 2011 (Cth) and relevant state/territory WHS Acts and Regulations
• Electrical Safety Act and Electrical Safety Regulations (state/territory specific, e.g. QLD Electrical Safety Act 2002)
• Safe Work Australia – Code of Practice: Managing electrical risks in the workplace
• Safe Work Australia – Code of Practice: Managing the risk of falls at workplaces
• Safe Work Australia – Code of Practice: Managing risks of plant in the workplace
• AS/NZS 3000: Electrical installations (Wiring Rules)
• AS 2067: Substations and high voltage installations exceeding 1 kV a.c.
• AS/NZS 7000: Overhead line design – Detailed procedures
• AS/NZS 1891 series: Industrial fall-arrest systems and devices
• AS/NZS 4836: Safe working on or near low-voltage electrical installations and equipment (used as guidance for HV safe work principles)
• AS/NZS ISO 45001: Occupational health and safety management systems