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 result in 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
- Electric Shock: Caused by damaged cords, frayed insulation, or improper earthing.
- Overloading: Using cords not rated for the task can lead to overheating and fires.
- Moisture Exposure: Using cords in wet conditions increases the risk of shock if not properly protected.
- Lack of RCD Protection: Without RCDs, there is no safeguard against ground faults, which can occur when electricity escapes its intended path.
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.
- Make sure there are no exposed wires or damaged sheathing.
Use RCDs on All Circuits:
- Connect all extension cords and portable equipment to RCD-protected outlets.
- Test the RCD before use by pressing the “Test” button—then reset it to confirm proper function.
Select the Right Cord:
- Use cords rated for the electrical load of your tools or equipment.
- Ensure cords are compliant with AS/NZS standards and are rated for outdoor use where necessary.
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 such use.
- 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 a non-RCD outlet. The insulation was cut, and the cord contacted water, resulting in a severe electric shock. The worker survived but required hospital treatment. This could have been avoided by inspecting the cord beforehand and ensuring RCD protection was in place.
Employee Responsibilities
- Inspect all extension cords and RCDs before every use.
- Report damaged cords or faulty RCDs immediately.
- Use only cords rated for the job and avoid temporary or makeshift repairs.
- Follow safe practices for temporary wiring on-site.
Employer Responsibilities
- Provide compliant RCDs and extension cords suitable for construction environments.
- Ensure regular inspection and maintenance of all temporary wiring.
- Replace damaged cords or faulty RCDs promptly.
- Train workers in the safe use and inspection of electrical equipment and extension leads.
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 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 the Health and Safety at Work Act 2015 (HSWA), PCBUs (Persons Conducting a Business or Undertaking) must manage the risks related to electrical hazards. WorkSafe NZ requires:
- The use of Residual Current Devices (RCDs) on all portable electrical tools and leads
- Regular inspection and testing of extension cords and temporary wiring in accordance with AS/NZS 3012: Electrical installations—Construction and demolition sites
- Worker training on safe work practices when using electrical equipment
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.
All Rights Reserved Site App Pro 2025