Fire Classes and Choosing the Right Extinguisher
The Problem
Fires are one of the most dangerous emergencies that can occur on a worksite. Not all fires are the same, and using the wrong type of fire extinguisher can make the situation worse or put you in danger. Today, we’ll discuss the different fire classes, which extinguishers to use for each, and how to be prepared to handle a fire safely.
Identify the Hazards
- Incorrect Extinguisher Use: Using the wrong extinguisher for a fire (e.g., water on an electrical fire) can worsen the fire or cause serious harm.
- Lack of Knowledge: Not recognising the fire class or extinguisher label can delay the response or make it ineffective.
- Unfamiliarity with Equipment: Workers who are unsure how to use extinguishers may panic or respond incorrectly in an emergency.
Safety Practices and Preventative Measures
Understand the Five Classes of Fire Hazards:
- Class A: Combustible materials like paper, wood, cloth. Use: Class A or multi-purpose (ABC) extinguishers.
- Class B: Flammable liquids like gasoline, solvents, paints. Use: Class B or multi-purpose extinguishers.
- Class C: Electrical fires (e.g., power tools, wiring). Use: Class C or multi-purpose extinguishers; never use water.
- Class D: Combustible metals like magnesium or aluminium. Use: Specialized Class D extinguishers.
- Class F: Cooking oils and fats (used in commercial kitchens). Use: Class F extinguishers.
Read and Understand Extinguisher Labels
- Extinguishers are labelled for the fire types they are suitable for.
- Most worksites use ABC extinguishers suitable for common fire risks.
- Always confirm the extinguisher is right for the type of fire.
if You’re Unsure — Don’t Risk It
- If you are not sure which extinguisher to use, evacuate and raise the alarm.
- Never try to fight a large or fast-growing fire.
- Prioritise personal safety and follow your site's emergency procedures.
Real-Life Case or Scenario
On one site, a worker used a water-based extinguisher on an electrical fire, not realizing it was a Class C fire. The water caused an arc, resulting in an electric shock. Fortunately, the worker survived, but it was a close call that could have been avoided with the correct training and awareness.
Employee Responsibilities
- Learn the different fire classes and extinguisher types available onsite.
- Check that extinguishers are accessible, undamaged, and clearly labelled.
- Report damaged or missing extinguishers immediately.
- Never attempt to extinguish a fire you’re unsure about — evacuate and alert others.
Employer Responsibilities
- Provide the correct types of fire extinguishers for all fire risks on site.
- Ensure regular servicing and maintenance of extinguishers in line with applicable Canadian standards (e.g., CAN/ULC-S504).
- Train all workers in the correct use of extinguishers and fire response.
- Make evacuation procedures and extinguisher locations clear and visible.
Discussion & Questions
- What types of extinguishers do we have on-site?
- Are there areas where we need additional or different extinguishers?
- Has anyone had to use an extinguisher? What worked well, and what didn’t?
Commitment/Action Plan
Let’s commit to reviewing the extinguishers in our work area today. Make sure you know what type each one is and where the nearest extinguisher is located. If anything is unclear, ask your supervisor. Being prepared is the best way to stay safe.
Wrap-Up
Understanding fire hazards and extinguisher types could save your life or someone else’s. By recognising the risks and using the right tools, you can prevent minor fires from becoming major incidents. Thank you for staying safety-focused.
Standards Overview
Under applicable provincial and territorial health and safety legislation and fire codes:
- Fire extinguishers must be maintained and tested regularly in accordance with applicable Canadian standards (e.g., CAN/ULC-S504).
- Workers must be trained in the safe use of fire extinguishers.
- Employers must manage fire risks and provide appropriate emergency equipment
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.
All Rights Reserved Site App Pro 2025