When it comes to electrical fires, CO2 fire extinguishers are the gold standard.
They’re clean, effective, and essential for protecting sensitive equipment without leaving a mess.
In this guide, we’ll explore how CO2 extinguishers work, where you should use them, the relevant British Standards, and how ESI can help you supply, install, maintain, and recycle them safely.
What Are CO2 Fire Extinguishers For?
CO2 fire extinguishers are designed primarily for Class E fires, which involve electrical equipment.
They’re also effective on Class B fires (flammable liquids). CO2 works by displacing oxygen around the fire, suffocating the flames without leaving any residue that could damage electronics.
Where Should They Be Used?
CO2 extinguishers are commonly installed in:
- Offices and server rooms
- Shops and retail spaces with tills or EPOS systems
- Switch rooms and control panels
- Laboratories and IT workshops
- Areas where electrical fires are a key risk
Because they don’t leave residue, they’re the perfect choice for environments where cleaning up foam or powder could damage equipment or create downtime.
British Standards and Compliance
CO2 fire extinguishers in the UK must comply with BS EN 3, which defines standards for performance, design, and labelling (black label).
For servicing, installation, and commissioning, they must meet the requirements set out in BS 5306-3.
Commissioning New CO2 Fire Extinguishers
Commissioning must be carried out by a competent technician and involves:
- Checking the body for damage
- Verifying weight and pressure
- Affixing service labels
- Ensuring the extinguisher is mounted correctly with the appropriate signage
CO2 Fire Extinguisher Servicing Requirements
CO2 extinguishers require servicing every year. Unlike water and foam units, CO2 extinguishers don’t require an extended service involving discharging, but they do need:
- Checking pressure and weight
- Inspecting the horn, hose, and components
- Ensuring labels and instructions remain legible
Technicians also check for leaks and confirm the extinguisher’s readiness.
Signage Requirements
Fire safety law requires clear signage near extinguishers. CO2 extinguisher signs must indicate:
- The type of extinguisher
- Suitable fire classes (electrical and flammable liquids)
- Warnings not to use in confined spaces without ventilation
This helps ensure safe and appropriate use in emergencies.
How ESI Can Help
At ESI, we’re dedicated to keeping your people, property, and equipment protected. We provide:
- Supply: Quality, BS EN 3-certified CO2 extinguishers
- Install: Professional commissioning and placement based on your risk assessment
- Maintain: Annual servicing in line with BS 5306-3
- Decommission: Safe removal of extinguishers past their service life
- Recycle: Environmentally responsible recycling and disposal
Stay Compliant and Confident
Electrical fires can cause devastating damage and downtime.
Make sure you’re protected and fully compliant with the latest UK regulations.
Contact ESI today to arrange a free site survey or to speak with our experts about CO2 fire extinguishers for your building.
