Wednesday 18th June 2025
Understanding Electrical Fires
Despite common terminology, electricity itself does not burn. What we call ‘electrical fires’ occur when electrical current heats materials near cables or equipment, causing them to ignite. These fires typically start in cable coverings or foreign objects inside electrical devices.
When dealing with fires involving live electrical equipment, you need extinguishers specifically tested and approved for electrical use. Using incorrect extinguishers, particularly water-based ones without proper testing, can risk electric shock.
Fire Extinguisher Types Safe for Electrical Equipment
Carbon Dioxide (CO2) Extinguishers
CO2 fire extinguishers have traditionally been the first choice for electrical fires. These extinguishers:
- Discharge non-conductive gas that smothers flames
- Leave no residue, protecting sensitive equipment
- Are highly effective fires involving electrical equipment
- Feature distinctive black labels
The main limitation of CO2 extinguishers is that the gas can disperse quickly, potentially allowing fires to reignite if the source of heat remains.
Powder Extinguishers
Powder extinguishers work effectively on electrical fires because:
- The powder does not conduct electricity
- They offer powerful fire suppression
- They work across multiple fire classes
However, powder extinguishers are now less recommended for indoor use due to potential respiratory irritation and reduced visibility when discharged, which might block escape routes.
Water Mist Extinguishers
Modern water mist extinguishers represent a significant advancement in fire safety technology:
- Use de-ionised water that cannot conduct electricity
- Discharge through specially designed nozzles creating ultra-fine mist
- Have passed di electric testing to 35,000 volts
- Safe for use up to 1000V from 1 metre distance
- Create minimal water damage to equipment
- Do not form dangerous water pools that might conduct electricity
- Offer excellent cooling properties
Eco Foam Extinguishers
The latest generation of foam extinguishers includes eco-friendly options:
- Free from harmful PFAS chemicals
- Di electrically tested for use on live electrical equipment
- Effective across multiple fire classes
- More environmentally responsible than traditional foams
- Provide good fire suppression capabilities
What is Di Electric Testing?
Di-electric testing verifies that extinguishers are safe for electrical fires. This rigorous testing ensures:
- No electrical current flows back to the person using the extinguisher
- Testing occurs at extremely high voltage (35,000V)
- Certified extinguishers are safe at specified distances
- Safety limitations (typically 1000V maximum and 1-metre minimum distance)
This certification is crucial when selecting extinguishers for areas with electrical equipment.
Safety Considerations for Electrical Fires
When selecting fire extinguishers for electrical equipment, consider:
- The types of electrical equipment in your building
- Potential fire risks from computers, printers, kitchen appliances
- The need for extinguishers that will not damage sensitive equipment
- Ensuring extinguishers are placed near higher-risk areas
Remember that when liquid extinguishers are used on electrical equipment, the electrical supply often cuts off automatically as fuses trip. This reduces but does not eliminate risk.
Choosing the Right Fire Extinguisher
For optimal protection against electrical fires, consider:
CO2 Extinguishers: Best for server rooms, offices with computers and areas with sensitive electrical equipment.
Water Mist Extinguishers: Excellent all-rounders that provide protection for fires involving electrical equipment while causing minimal damage.
Eco Foam Extinguishers: Good choice for areas with mixed fire risks, including electrical components.
The right fire extinguisher improves safety outcomes and protects valuable equipment. While CO2 extinguishers remain popular for electrical fires, newer technologies like water mist offer effective alternatives with additional benefits.
For your business or home, assess all potential fire risks, including electrical equipment such as laptops, printers and kitchen appliances, when planning your fire safety strategy.
As the UK’s leading fire safety company, Safelincs offers a complete range of extinguishers suitable for electrical equipment, backed by award-winning customer service and fire safety expertise.
All information correct at time of posting.
