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When an electrical fire breaks out, your first instinct might be to grab the nearest fire extinguisher—but using the wrong one can make things worse. Water-based fire extinguishers, for example, can turn a small fire into a shock hazard, putting you at risk of electrical shock and even spreading the flames.

That’s why it’s essential to use the correct type of fire extinguisher for electrical fires. Whether it’s a faulty wiring issue, an overheated appliance, or a spark from energized electrical equipment, knowing which extinguisher to use can make all the difference in safely extinguishing the fire and preventing damage.

Let’s look at the best fire extinguisher options for electrical fires, why certain extinguishers should be avoided, and how to use them properly.

Key Takeaways

• Electrical fires require non-conductive extinguishers like CO₂ or Class C dry chemical extinguishers to prevent shock hazards.
• Regular inspections and proper placement of fire extinguishers are essential for effective fire safety preparedness.
• Using the wrong extinguisher, such as water-based options, on electrical fires can worsen the situation and increase risks.

All About Electrical Fires

Not all fires are the same, and that’s especially true for an electrical fire. Unlike fires fueled by ordinary combustible materials like wood or paper, electrical fires involve energized electrical equipment, which makes them particularly dangerous. Using the wrong fire extinguishers can cause electric shock or even make the fire worse.

What is an electrical fire?

An electrical fire is any fire that starts due to faulty wiring, overloaded circuits, or malfunctioning electrical devices. These fires are classified as Class C fires, meaning they require non-conductive extinguishing agents to put them out safely.

Unlike flammable liquid fires (Class B fires) or cooking appliance fires (Class K fires), electrical fires can’t be fought with water-based fire extinguishers because water conducts electricity, creating a shock hazard. Instead, specialized Class C fire extinguishers are needed to safely handle the situation.

Common causes of electrical fires

Electrical fires can happen anywhere—from homes and offices to operating rooms and industrial facilities. Some of the most common causes include:

• Faulty wiring – Exposed, damaged, or aging wires can spark and ignite nearby materials.
• Overloaded circuits – Plugging too many devices into one outlet can overheat electrical sources and start a fire.
• Malfunctioning electrical equipment – Appliances, kitchen appliances, and power tools with damaged cords or internal faults can generate heat and ignite.
• Fuse boxes and electrical panels – Old or improperly maintained panels can overheat, leading to fires.

Why are electrical fires so dangerous?

Electrical fires pose unique risks compared to other types of fires:

• Shock hazard – Using the wrong type of fire extinguisher for electrical fires can lead to electrical shock, putting lives in danger.
• Spreads rapidly – Electrical currents can travel through wires and walls, making fires spread unpredictably.
• Hidden dangers – Some electrical fires start behind walls or inside equipment, making them hard to detect before they grow.

The good news? The right fire safety equipment, such as portable fire extinguishers designed for Class C fires, can help control and eliminate the fire safely.

Fire Extinguisher Classifications

As we've mentioned above, not all fire extinguishers are designed to handle the same type of fire. Each fire is classified based on its fuel source, and using the wrong extinguisher can be ineffective—or even dangerous.

Overview of fire classes

Fire extinguishers are categorized into different fire extinguisher types based on the kind of fire they are designed to fight:

• Class A – Fires fueled by ordinary combustibles like wood, paper, and fabric.
• Class B – Fires involving flammable liquids such as gasoline, oil-based paints, and animal oils.
• Class C – Fires caused by electrical sources, including wiring, appliances, and power tools.
• Class D – Fires involving combustible metals like magnesium or aluminum.
• Class K – Fires related to kitchen fires, including vegetable oils and cooking grease.

Since Class C fires involve energized electrical equipment, they require specific extinguishers that use non-conductive agents to safely put them out.

Focus on class C fires

A Class C fire is unique because it involves electricity as the heat source. Unlike Class A or B fires, which can be extinguished with water or foam, Class C fire extinguishers must use dry chemical extinguishers or carbon dioxide extinguishers to avoid electrical shock.

• Carbon dioxide (CO₂) extinguishers – Work by displacing oxygen, smothering the fire without leaving residue.
• Dry chemical extinguishers (ABC or BC-rated) – Use potassium bicarbonate or potassium chloride to break the chemical reaction that sustains the fire.

Using the right extinguishing agent is a crucial step in handling an electrical fire safely. That’s why fire safety training and regular inspections of your portable fire extinguishers are essential for any home or workplace.

Recommended Fire Extinguishers for Electrical Fires

When dealing with a Class C fire, the right fire extinguisher for electrical fires is essential. Since these fires involve energized electrical sources, the extinguisher must use a non-conductive extinguishing agent to prevent electrical shock while effectively putting out the flames.

Carbon dioxide (CO₂) extinguishers

One of the best options for Class C fires is a carbon dioxide (CO₂) extinguisher. These work by displacing oxygen, which starves the fire while also creating a cooling effect to lower the temperature. Unlike wet chemical extinguishers or water-based options, CO₂ extinguishers leave no residue, making them ideal for protecting sensitive electronic equipment such as:

• Computer servers
• Electrical panels
• Laboratory equipment
• Office electronics

Because CO₂ extinguishers quickly dissipate into the air, they are best suited for small fires in enclosed areas rather than large square feet spaces where the gas might disperse too quickly.

Dry powder extinguishers

Another effective choice for Class C fire extinguishers is the dry chemical extinguisher. These extinguishers release a fine powder that smothers the fire, interrupting the chemical reaction that keeps it burning.

There are two main types:

• BC dry chemical extinguishers – Designed for Class B (flammable liquids) and Class C (electrical fires).
• ABC dry chemical extinguishers – Suitable for Class A (ordinary combustibles), Class B, and Class C fires, making them versatile for multiple fire types.

However, while dry chemical extinguishers are highly effective, they leave a powdery residue that can damage electrical devices and is difficult to clean. Because of this, CO₂ extinguishers are often preferred for areas with electronics, while dry powder extinguishers are used when versatility is needed.

Proper Usage of Fire Extinguishers on Electrical Fires

Even with the right fire extinguisher, using it correctly is just as important. A mistake in handling could lead to electrical shock, injury, or worsening of the fire. Here’s how to safely extinguish an electrical fire while minimizing risks.

Safety precautions

Before using a Class C fire extinguisher, take these crucial steps:

• Never touch electrical equipment with bare hands. Live electrical currents can travel through your body, causing serious injury.
• Disconnect the power source if it’s safe to do so. Cutting off electricity removes the fuel source, making the fire easier to put out. If the fire is near a breaker panel, shut off power to the affected area.
• Stand at a safe distance. Most fire extinguisher types have a recommended operating range—typically 6–10 feet away from the fire.

Steps to use an extinguisher (PASS Technique)

The PASS method is the standard fire extinguisher training technique for effective fire suppression:

• PULL the pin – This unlocks the extinguisher and allows it to discharge.
• AIM at the base of the fire – Targeting the flames won't work; you need to smother the source.
• SQUEEZE the handle – Release the extinguishing agent in a controlled manner.
• SWEEP from side to side – Cover the entire fire area until the flames are out.

Always follow the manufacturer’s recommendations and ensure proper use of your extinguisher. If the fire is too large to control, evacuate immediately and call emergency services.

Maintenance and Accessibility of Fire Extinguishers

Having the right type of fire extinguisher for electrical fires is essential, but it won’t do much good if it’s damaged, expired, or out of reach when needed. Keeping fire extinguishers properly maintained and accessible ensures they’re ready when emergencies strike.

Regular inspections

Routine checks are a crucial step in fire safety. A neglected extinguisher may fail to discharge properly, putting people and property at risk. To keep your Class C extinguishers in top shape:

• Check pressure gauges monthly to ensure they are fully charged.
• Inspect for visible damage like rust, leaks, or broken handles.
• Ensure the pin and tamper seal are intact to prevent accidental discharge.
• Schedule professional servicing according to the manufacturer’s recommendations—typically once a year.

Proper placement

Even a fully operational extinguisher won’t help if it’s buried in a storage closet. Fire extinguishers should be placed in high-risk areas where electrical fires are more likely to occur:

• Server rooms & data centers – Protects electrical equipment from overheating fires.
• Workshops & industrial sites – Areas with other electrical sources and machinery need quick access to non-conductive materials for fire suppression.
• Kitchens – Many appliances can cause electrical fires, so having the correct extinguisher alongside Class K extinguishers (for grease fires) is essential.
• Office spaces – Printers, computers, and extension cords are common fire risks.

Conducting regular inspections and ensuring proper placement can prevent a small electrical fire from becoming a major disaster.

Be Fire-Ready Before It’s Too Late

An electrical fire can start in seconds—will you be prepared? Swartz Fire & Safety provides the right fire extinguishers, expert training, and regular maintenance to keep your property safe. Whether you need Class C fire extinguishers or a full fire safety plan, we’re here to help.

Stay protected. Stay prepared. Contact us today!

Frequently Asked Questions

Is ABC fire extinguisher good for electrical fires?

Yes, an ABC fire extinguisher can be used on electrical fires, as it contains dry chemical agents that are non-conductive. However, CO₂ extinguishers are often preferred for electrical equipment since they leave no residue.

What is a type 3 fire extinguisher?

There is no official Type 3 fire extinguisher classification, but fire extinguishers are categorized by class (A, B, C, D, and K) based on the type of fire they are designed to fight. If you’re looking for the right extinguisher, check its fire class rating rather than a numbered type.

Is a CO2 extinguisher for electrical?

Yes! A CO₂ extinguisher is one of the best options for electrical fires because it displaces oxygen, smothering the flames without leaving damaging residue on electrical equipment.

What type of fire extinguisher is used for electrical panels?

For electrical panels, the best options are CO₂ fire extinguishers (which leave no residue) or Class C dry chemical extinguishers (which effectively smother flames but leave some residue).