Electrical Safety on Scaffolds
The Problem
Scaffolding is a vital part of many work sites, but one of the most dangerous and often overlooked hazards is accidental contact with live overhead power lines. Whether it’s the scaffold itself, tools, or materials coming into contact with lines, the result can be electrocution, severe burns, or fatalities. Today, we’ll focus on identifying electrical hazards and adopting safety practices to maintain a safe distance from overhead power lines on New Zealand job sites.
Identify the Hazards
- Scaffolds Too Close to Power Lines: Erecting or relocating scaffolds without confirming minimum safe distances.
- Conductive Tools and Materials: Metal pipes, tools, and conduits that could contact live wires.
- Sagging or Low Power Lines: Reduced clearance from wear or environmental damage.
- Unstable Ground Conditions: Uneven terrain causing scaffolds to shift toward power lines.
Safety Practices and Preventative Measures
1. Conduct a Site Survey:
- At the beginning of each shift or before moving/erecting a scaffold, identify all nearby overhead lines.
- Reassess after any changes to scaffold location, terrain, or work conditions.
- Watch for elevation changes and sloping ground that may reduce clearances.
2. Maintain Safe Distances:
WorkSafe NZ minimum approach distances (MAD) for scaffolds:
- Low Voltage (≤1kV): 4 metres minimum.
- High Voltage (>1kV): 6–10 metres minimum, depending on voltage level.
- If work must occur within these distances, it must stop immediately and the power supplier must be contacted to isolate or insulate the lines.
3. Assign a Spotter When Moving Scaffolds:
- Use a designated observer to monitor clearances.
- Cease scaffold movement immediately if the safe distance is at risk.
4. Avoid Conductive Tools and Materials:
- Replace metal tools with insulated or non-conductive alternatives (e.g., fibreglass).
- Exercise extreme care when handling long or metallic materials near overhead lines.
Real-Life Case or Scenario
A crew on a site in Auckland was moving a steel scaffold when a pole brushed an uninsulated 11kV line. No spotter had been assigned, and the hazard wasn’t identified during the pre-shift assessment. One worker suffered serious burns. This incident could have been avoided with a simple survey and use of a competent observer.
Employee Responsibilities
- Survey work areas and identify overhead electrical hazards.
- Maintain safe clearances at all times.
- Use non-conductive tools and take care with long materials.
- Report any electrical hazard or low power line to your supervisor immediately.
Employer Responsibilities
- Train workers in identifying electrical hazards and working safely near power lines.
- Ensure a Competent Person verifies scaffold clearance.
- Liaise with the power provider if scaffolds must be erected near power lines.
- Provide non-conductive tools and ensure inspections are completed regularly.
Discussion & Questions
- “Have you ever encountered a scaffold near power lines? What was done to stay safe?”
- “What’s your process for checking for electrical hazards before scaffold work?”
- “What challenges do you face staying clear of overhead lines on your jobs?”
Encourage team members to share experiences or ask questions.
Commitment/Action Plan
Let’s commit to surveying each work area for overhead lines before every shift. Never work within the minimum approach distance unless power has been de-energised or insulated. If you’re unsure, speak with the Competent Person and always err on the side of caution.
Wrap-Up
Electricity is silent, swift, and unforgiving. Keeping safe distances from power lines is not optional—it’s lifesaving. Let’s protect ourselves and our mates by following WorkSafe NZ guidelines, inspecting every day, and never taking chances.
Standards Overview
According to WorkSafe NZ’s Best Practice Guidelines for Working Near Power Lines:
- A minimum distance of 4 metres must be maintained from live low-voltage lines (unless the lines are de-energised or properly insulated).
- Higher voltages require greater distances.
- A Competent Person must verify safe working procedures and clearance distances are maintained.
Disclaimer
These toolbox talks are provided for informational and educational purposes only and are not a substitute for professional legal, health and safety, or regulatory advice.
The content reflects recognised best practices and general industry standards as at the date of publication. However, it may not be applicable to all workplace environments or specific operational contexts.
It is the responsibility of the Person Conducting a Business or Undertaking (PCBU), as well as officers, workers, and other duty holders under the Health and Safety at Work Act 2015 (HSWA), to ensure compliance with all relevant laws, regulations, and WorkSafe New Zealand guidance.
The authors, presenters, and distributors of this toolbox talk disclaim all liability for any loss, damage, or injury arising from the use or reliance on the information provided. Users should seek advice from a suitably qualified health and safety professional or legal advisor for guidance tailored to their specific circumstances.
Always follow your organisation’s policies, procedures, and safe work practices to manage risks and maintain a safe and healthy workplace.
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