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 the 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 Canadian 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 due to wear, weather, 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 power 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
- Follow CCOHS and provincial utility regulations for minimum approach distances (MAD):
- Low Voltage (≤750V to 1kV): Minimum 3 to 4 metres.
- High Voltage (>1kV): Minimum 6 to 10 metres, depending on the voltage level.
- If work must occur within these distances, stop immediately and contact the utility provider to isolate or insulate the lines.
3. Assign a Spotter When Moving Scaffolds
- Use a designated observer to monitor scaffold clearance from overhead lines.
- Cease movement immediately if the minimum safe distance is at risk.
4. Avoid Conductive Tools and Materials
- Replace metal tools with insulated or non-conductive alternatives (e.g., fibreglass).
- Use extreme caution when handling long or metallic materials near overhead lines.
Real-Life Case or Scenario
A crew on a site in Ontario was moving a steel scaffold when a pole brushed an uninsulated 11kV overhead 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 site survey and the 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
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 the 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 teammates by following CCOHS guidelines, inspecting every day, and never taking chances.
Standards Overview
According to CCOHS and applicable provincial regulations for working near overhead power lines:
- A minimum distance of 3 to 4 metres must be maintained from live low-voltage lines, unless the lines are de-energized or properly insulated.
- Higher voltage lines require greater minimum approach distances, as defined by the utility or local authority.
- A competent person must verify that safe work procedures are in place and that required clearances are maintained at all times.
Disclaimer
“The information provided in this toolbox talk is intended for informational and educational purposes only. It is not a substitute for professional legal, safety, or regulatory advice. The content reflects general best practices and industry standards but may not be applicable to all workplace environments or jurisdictions.
It is the responsibility of employers, supervisors, and workers to ensure compliance with applicable federal, provincial, and territorial laws, regulations, and standards, including but not limited to those set by the Canadian Centre for Occupational Health and Safety (CCOHS) and relevant provincial occupational health and safety authorities. Site App Pro, its affiliates, agents, or representatives—as well as the authors, presenters, and distributors of this toolbox talk—assume no liability for the use or application of the information provided.
Participants are strongly encouraged to consult appropriate legal, safety, or regulatory professionals regarding specific workplace concerns or questions. Always adhere to your organisation’s policies and procedures for health and safety and hazard management.
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