Best Fire Extinguisher for Electrical Fires

Fire Extinguisher for Electrical Fires

If you’re faced with an electrical fire, you need to use the correct fire extinguisher to avoid electrocution. Read on to find out which fire extinguisher to use for electrical fires and how to avoid a freeze burn while handling a carbon dioxide extinguisher.

Which fire extinguisher should you use for an electrical fire?

The most common fire extinguishers for electrical fires are Carbon Dioxide or Dry Powder. These will both starve a fire of oxygen without giving you an electric shock. There are also two newer types of extinguisher – Water Mist and Lith-Ex – which you can use on electrical fires. Don’t confuse Water Mist with the traditional Water fire extinguisher – which would be very dangerous to use on an electrical fire!

You need to handle each type of fire extinguisher slightly differently to avoid injuries like freeze burn or asphyxiation. So, let’s briefly break down the safe use of each extinguisher.

Carbon Dioxide Fire Extinguisher for Electrical Fires

Fire Extinguisher - CO2
Thanks to the large black CO2 label, you can easily identify carbon dioxide extinguishers.

Carbon dioxide fire extinguishers are very effective for electrical fires, but they come with handling risks. You shouldn’t use them in confined spaces due to the risk of suffocation, and you need to handle them carefully to avoid freeze burns.

To prevent freeze burns, you should never hold a carbon dioxide extinguisher by the horn. If the horn is damaged, it’s best not to use the extinguisher.

Note: You should NOT use a carbon dioxide fire extinguisher for cooking oil or fat fires, solid combustibles, or flammable gases.

Dry Powder Fire Extinguisher for Electrical Fires

Fire Extinguisher - Dry Powder
Dry Powder Fire Extinguishers are also known as ABC or multi-purpose fire extinguishers. You can recognise them thanks to their blue label which says Powder.

When using this extinguisher, the dry powder will create a barrier between the fire and surrounding oxygen, putting the fire out. You shouldn’t use this extinguisher in enclosed spaces because of the risk of inhaling the chemical powder. The powder can also obscure your vision, so ensure you’re safe from steep drops or trip hazards before using it.

Water Mist Fire Extinguisher for Electrical Fires

Fire Extinguisher - Water Mist
You cannot use a standard Water fire extinguisher for electrical fire – because there is a risk you will electrocute yourself. However, Water Mist extinguishers contain de-ionised water – meaning they cannot carry an electrical current. The water droplets creating the mist are so tiny and spaced out that an electrical current couldn’t pass through the mist to reach you. They are a better choice for enclosed spaces than carbon dioxide or dry powder.

However, water mist extinguishers are quite new.  So, you’re much more likely to have a carbon dioxide or dry powder extinguisher available in your workplace.

Lith-Ex Fire Extinguisher for Electrical Fires

Fire Extinguisher - Lith-Ex
Lith-Ex Fire Extinguishers have a green label. These can be a great option for small fires caused by lithium batteries, which can be found in devices like mobile phones, power tools, laptops, vapes, and in electric vehicles like bicycles, scooters, and electric cars.

Lithium batteries can overheat and even explode if they are faulty or if they are overcharged. This is normally only a problem when the safety features fail – but it can happen fast and create dangerous toxic fumes. Be aware that lithium battery fires can be difficult to put out. Take a look at a video from Hertfordshire Fire Rescue Service on Lithium Battery Safety in the Workplace.

How do you put out an electrical fire?

In the face of a major fire, evacuate the building immediately and call 999.

You should only attempt to put out a fire when it is safe to do so – such as a small fire that hasn’t had the chance to spread. You want to position yourself between the fire and a safe exit, so you can evacuate safely if you can’t put out the fire or the fire spreads.

First, and only if it is possible, you should cut off the power source so an electrical current is no longer flowing.

Second, you must select a suitable extinguisher and check that the pressure gauge needle is set in the green zone. Remember – for an electrical fire – that means a Dry Powder, Carbon Dioxide, Water Mist, or Lith-Ex extinguisher.

Direct the nozzle straight at the fire and pull out the safety pin or ring. Then squeeze the lever to discharge the contents of the extinguisher. As the fire starts to die down you can move closer. Use the entire contents of the fire extinguisher.

Don’t be surprised if the fire extinguisher empties quickly – a 5kg carbon dioxide extinguisher will only have around 10 seconds of carbon dioxide to discharge.

Common sources of electrical fires

Electrical wiring
Electrical fires often start because of overloaded plug sockets, incorrect wiring, or faulty electrical equipment. You can reduce the risk of an electrical fire by turning off electrics at the plug when they aren’t in use, making sure a licensed professional electrician carries out any electrical work, and getting electrical devices PAT tested before using them in an office environment.

Virtually all circuits in new or rewired UK buildings now include circuit breakers (RCDs) to help prevent electrical fires. But if you live or work in an older building, it’s worth asking a professional to check that a RCD is installed and that wiring is in good condition.

You can also ask an electrician to install electrical Arc Fault Detection Devices (AFDD) to detect electric socket faults early. In some buildings – like care homes – these are now mandatory.

To avoid lithium battery fires, you shouldn’t charge the batteries unattended and you shouldn’t leave them plugged in overnight.

We hope you found this article about the best fire extinguisher for electrical fires helpful!

Remember, you must have your fire extinguishers serviced every 12 months and in accordance with BS 5036-3.

Would you like more information on fire extinguishers?

To learn more about the safe use of fire extinguishers, you can take our online fire extinguisher awareness training course, which is fully up-to-date and RoSPA-assured. If you have any questions, contact our friendly team by phone 0333 577 5016 or email [email protected].

Single sign-on (SSO)

Our LMS can be configured to authenticate with your systems, so your users don’t need to remember additional passwords or usernames.

Competence Assurance

Our integrated software environment helps you to plan, develop and monitor enterprise capability and compliance, to minimise the risk of incidents and non-compliance.

Bespoke Online Training

We believe that a desire to acquire new knowledge and skills is the most powerful motivator for most individuals - not gimmicks or tricks.

Call us on 0333 577 5016 for more information or complete the contact form and we'll call you back.