28/07/2025
Fire Extinguishers for Electrical Fires: Everything You Need to Know
Electrical fires are a common yet dangerous risk in workplaces and commercial properties. Whether caused by faulty wiring, overloaded circuits, or malfunctioning equipment, fires involving live electrical equipment demand a fast response. Using the wrong type of fire extinguisher can make the situation worse or put lives at risk.
Our guide explains how to extinguish electrical fires safely, what type of fire extinguisher you need, and how Sygma can help your business stay protected and compliant.
Understanding Different Types of Fire Extinguishers
Fire extinguishers are classified by the type of fire they are designed to tackle:
- Class A: Ordinary combustibles like wood, paper, and textiles
- Class B: Flammable liquids such as petrol and oils
- Class C: Fires involving flammable gases
- Class D: Fires involving combustible metals
- Class F: Cooking oils and fats
- Electrical: Fires involving live electrical equipment (no formal UK ‘Class E’ but often referenced for clarity)
Using a water or foam extinguisher on an electrical fire risks an electric shock. This is why it is essential to select a fire extinguisher designed specifically for electrical equipment. So, which of these extinguishers should be used in an electrical fire?
Want to further discuss the right fire extinguisher for your workplace? Talk with a member of our team.
Class C Fire Extinguishers: The best choice for electrical fires
In the UK, CO₂ (carbon dioxide) and dry powder extinguishers are recognised as the only suitable options for electrical fires:
- CO₂ Extinguishers: Ideal for live electrical equipment fires. CO₂ displaces oxygen, smothering the fire without leaving residue or conducting electricity. Commonly used in server rooms, offices, and areas with sensitive electronics.
- Dry Powder Extinguishers: Versatile for Class A, B, and C fires, and safe on electrical fires. They work by interrupting the chemical reaction of the fire, but may leave residue that damages equipment.
CO₂ extinguishers are typically recommended for most workplace settings involving electrical risk.
How to use fire extinguishers on live electrical equipment
- Turn off the power source if safe to do so: This reduces the risk of reignition.
- Use a CO₂ extinguisher: Aim at the base of the flames and sweep side to side.
- Do not touch metal parts of the extinguisher nozzle: They can freeze on contact due to CO₂ discharge.
- Evacuate if the fire cannot be controlled quickly: Always prioritise life safety.
Call us today on 0800 043 6728 to discuss your fire extinguisher options for electrical fires.
Safety precautions to consider when dealing with electrical fires
- Never use water or foam extinguishers on live electrical equipment.
- Ensure staff are trained on the correct extinguisher types and their safe use.
- Regularly inspect and maintain extinguishers in line with British Standards.
- Carry out routine fire risk assessments that account for electrical equipment hazards.
At Sygma, we help businesses across the UK stay compliant and prepared for every fire risk, including electrical fires. Our services include: fire extinguisher supply, installation, and maintenance, Staff training on fire safety and extinguisher use, electrical fire risk assessments and compliance checks, and emergency planning and safety audits.
Let us help protect your workplace with expert advice and fully compliant fire safety solutions. Contact us today on 0800 043 6728 to speak to one of our fire safety specialists.