Using GFCIs and Inspecting Extension Cords
The Problem
Extension cords and temporary wiring are commonly used on job sites, but they also present serious electrical hazards. Damaged cords, exposed wiring, or the absence of Residual Current Devices (RCDs) can lead to electric shock, fires, or even fatalities. Today, we’ll discuss how to inspect extension cords and use RCDs correctly to protect ourselves and others on-site.
Identify the Hazards
Safety Practices and Preventative Measures
To reduce these risks, always follow these steps:
Inspect Extension Cords Before Use
- Look for cuts, cracks, or frayed insulation.
- Check plugs and prongs for damage or looseness.
- Ensure there are no exposed wires or damaged sheathing.
Use RCDs on All Circuits
- Connect all extension cords and portable equipment to RCD- or GFCI-protected outlets.
- Test the RCD/GFCI before use by pressing the "Test" button—then reset it to confirm proper function.
Select the Right Cord
- Use extension cords rated for the electrical load of your tools or equipment.
- Ensure cords are CSA-approved and rated for outdoor or heavy-duty use where required.
Protect Cords From Damage
- Never run cords through windows, doorways, or over sharp edges.
- Keep cords out of high-traffic areas or protect them with cord covers or mats to prevent damage from foot traffic or vehicles.
Avoid Wet Conditions
- Never use extension cords or electrical tools in wet areas unless they are specifically rated for that purpose.
- Wear appropriate PPE such as rubber-soled boots and insulated gloves in damp environments.
Regular Maintenance and Reporting
- Immediately remove damaged cords from service.
- Tag defective cords and report them to your supervisor for inspection or replacement.
Real-Life Case or Scenario
A worker once used a damaged extension cord on-site and plugged it into an outlet without RCD or GFCI protection. The insulation was cut, and the cord came into contact with water, resulting in a severe electric shock. The worker survived but required hospital treatment. This incident could have been avoided by inspecting the cord beforehand and ensuring proper RCD protection was in place.
Employee Responsibilities
Employer Responsibilities
- Provide compliant RCDs and extension cords that are suitable for use in construction environments.
- Ensure regular inspection and maintenance of all temporary wiring and electrical equipment.
- Replace damaged cords or faulty RCDs promptly to prevent electrical hazards.
- Train workers in the safe use, inspection, and handling of extension leads and electrical equipment.
Discussion & Questions
- “What common issues have you come across with extension cords or RCDs on this site?”
- “How do you check if an RCD is functioning properly?”
- “Has anyone experienced a near-miss or incident involving extension cords or temporary wiring?”
- Encourage workers to share their experiences and raise any concerns.
Commitment/Action Plan
Starting today, let’s commit to inspecting every extension cord and RCD before use. If you find any damage or a fault, report it immediately. Together, we can keep the job site safe from avoidable electrical hazards.
Wrap-Up
Electrical incidents caused by extension cords and temporary wiring are preventable. By using RCD protection and taking the time to inspect equipment before use, we reduce the risk of injury and help create a safer workplace. Thank you for your attention and your commitment to safety.
Standards Overview
Under Canadian occupational health and safety legislation, employers must manage the risks associated with electrical hazards. According to CCOHS and provincial regulations, employers are required to:
- Use Ground Fault Circuit Interrupters (GFCIs) or Residual Current Devices (RCDs) on all portable electrical tools and extension cords used on construction sites.
- Conduct regular inspection and testing of extension cords and temporary wiring, in accordance with CSA standards and applicable provincial electrical safety codes.
- Provide worker training on safe work practices when using electrical equipment on-site.
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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