Selecting the Right Fire Extinguisher for Electrical Fires

An electrical fire is not simply a fire with a different fuel. It involves heat, smoke and often an energised source, so the response must control ignition risk without giving the operator a new electric shock hazard. The right extinguisher depends on what is burning, whether the equipment can be isolated safely, the surrounding materials and whether anyone can escape without passing the fire. In an Australian workplace, that decision should also match local classification, service and emergency arrangements.

Most incidents begin with equipment failure, overheating, damaged wiring or a battery fault. Australian workplaces are increasingly exposed to rooftop solar, electric vehicles, portable tools and dense electronics in offices, warehouses and industrial facilities. A unit that works for a paper or solvent fire may therefore be unsuitable, while a general-purpose powder extinguisher may create visibility and cleanup problems. Selection should be based on a documented site risk assessment rather than on the label “fire extinguisher” alone. The goal is a safe initial response, not an attempt to defeat a developed fire.

Why electrical fires need a specific response

Electricity changes both the risk and the required response. An arc or fault may continue while the circuit is energised, and extinguishing flames does not prove the circuit is safe to touch. Isolating the supply removes ignition energy, but only a competent, authorised person should operate high-voltage isolators, inverters or battery systems. Staff should never open switchboards, pull damaged cables or handle a burning EV simply to reach a control. A fixed extinguisher provides an immediate option for small, contained fires while the emergency plan continues.

Under Australian classifications, electrical equipment is commonly identified as Class E, and portable units may carry ratings such as B/E or BE. A rating tells you the hazard and size the extinguisher is intended to suppress; it does not mean every fire involving electricity is safe for an untrained person to fight. In the Australian market, check that the cylinder has appropriate Australian-standard compliance markings and identification. Imported CE or UKCA equipment should not be assumed to carry the correct local rating or service history. This matters especially for contractors and sites that import equipment from overseas.

The setting can alter the answer quickly. A small overloaded adaptor in a Sydney office may be handled with a correctly rated CO₂ extinguisher, while a transformer, solar inverter, control panel or charging bay in Melbourne, Brisbane or Perth can involve toxic smoke, high energy or delayed reignition. Industrial sites also contain combustible dust, oils and plastics around electrical assets. A single extinguisher must fit the risk profile of that equipment and room, not merely the desk or cabinet where it is stored.

Follow Australian classifications and workplace requirements

Fire protection is part of workplace risk control, not an optional facility. Under the Work Health and Safety Act 2011 and the applicable state or territory rules, employers should identify hazards, provide suitable equipment and information, and ensure workers can use it without exceeding their training. State and territory building fire codes can add placement and access requirements. For Australian sites, the risk assessment should reference relevant AS/NZS guidance, including AS/NZS 1861 for classification and AS/NZS 1891 for portable-extinguisher maintenance and testing.

Begin by mapping every credible electrical ignition point: switchboards, distribution boards, welders, chargers, test equipment, servers, kitchen appliances and outdoor power points. Ask whether a fault could also ignite liquids, paper, aerosols, metal or cooking oil. A mixed hazard may justify an ABE dry chemical powder unit as part of the response, even though CO₂ is often better for delicate, enclosed electrical equipment. The rating and location must match the hazard and be verified against the applicable installation code. Do not rely on a general workplace policy that overlooks the equipment involved.

Account for who will use it and what happens around the fire. A laboratory, workshop or switchroom may need more than a wall-mounted cylinder, while a kitchen or server room may need a specific unit positioned near the hazard. Confined spaces require particular caution because CO₂ can displace oxygen, and operating cylinders in hot, wet or corrosive industrial areas may damage equipment. Check local fire-service guidance, insurer requirements and the manufacturer’s limitations before finalising the selection. Planned access for emergency responders should be considered as well.

Compare the main extinguisher choices

Carbon dioxide extinguishers are often the first choice for a small electrical-equipment fire because they leave no corrosive residue and are commonly marked for electrical use. They can suppress flames around panels, computers and laboratory instruments without the powder and visibility problems of dry chemicals. CO₂ is not a cooling agent in the way water is, so re-ignition remains possible. Never enter a confined space to use it, and ensure ventilation and escape routes are considered before discharge. For high-value equipment, confirm that the selected rating and application are suitable before relying on it.

Dry chemical powder extinguishers, usually monammonium phosphate in Australian ABE units, provide strong flame knockdown and may also address ordinary combustibles or flammable liquids. They can be a practical broad-risk choice where mixed electrical and combustible-material hazards exist. However, airborne powder can obscure vision, irritate breathing, settle inside equipment and require specialist cleanup, making it less suitable for occupied rooms, control panels and electronics. It may also be inappropriate where the manufacturer excludes dust-sensitive or highly sensitive equipment.

Conventional water and foam extinguishers should not be used on energised electrical equipment; both can conduct current and increase shock risk. A specialist water-mist unit may carry a suitable electrical rating, but only its certification and instructions justify that use. Neither CO₂ nor powder automatically makes an extinguisher suitable for lithium-ion battery thermal runaway, and rooftop solar arrays may remain energised in daylight. For EV or battery incidents, isolate only if safe, withdraw, call 000 and follow the fire brigade’s established protocol rather than opening a pack or improvising.

Use electrical-fire equipment safely

The first priority is people. Raise the alarm, call 000 and follow the site emergency plan; do not delay emergency notification while looking for an extinguisher. A portable extinguisher should be used only for a small, contained fire, by a trained person, with a clear route to safety. Before approaching, identify the exact equipment involved and check for smoke, toxic fumes, damaged conductors, batteries or an explosion risk. If those conditions are unacceptable, evacuate and close doors behind you. Never allow concern for equipment or property to override evacuation.

If it is safe and authorised, isolate the affected circuit at the appropriate local isolator or breaker. Do not enter panels, touch energised parts or climb onto roofs to disconnect photovoltaic wiring. Aim the extinguisher at the base of the fire from the recommended distance, using the PASS technique: pull, aim, squeeze and sweep. Keep low where smoke is gathering, maintain visibility and discharge only as much as needed. Stop and retreat if the nozzle freezes, the cylinder is damaged or conditions worsen. The operator should keep the exit route in sight throughout.

After flames are out, watch for re-ignition, particularly with motors, heaters, EV chargers and lithium-ion cells. Keep people away, arrange isolation and inspection by a licensed electrician, and report the incident for investigation and equipment restoration. Do not reset a protective device or restore power until the cause is known. Following a significant discharge or contamination, arrange appropriate cleanup; for CO₂, allow the area to be ventilated because the gas can create an asphyxiation hazard. Training and drills should include these decisions rather than focusing only on the physical technique.

Build a practical electrical-fire readiness plan

A reliable response depends on equipment, placement, maintenance and human behaviour working together. Use the following measures to turn the extinguisher choice into a site-ready control rather than a compliance exercise.

Complete a scenario-based electrical-fire risk assessment covering switchrooms, solar PV, EV charging, portable tools, server rooms and contractor work. Map adjacent combustible hazards and define who is authorised to isolate supply.
Select units from the actual hazard rating and equipment manufacturer’s instructions. Confirm Australian-standard identification, extinguisher capacity, fluid type and any environmental or confined-space limitations before purchase.
Match protection to the site: CO₂ for suitable enclosed electrical equipment, powder where broader flame knockdown is justified, and specialist systems where the risk assessment requires them.
Locate each extinguisher on the escape-route side of the hazard, visible and unobstructed, with signage identifying the electrical hazard and operating method. Placement must follow the applicable state or territory code rather than an improvised rule of thumb.
Implement the inspection and servicing schedule required by AS/NZS 1891, the manufacturer and site risk controls. Keep service tags, test records and replacement dates accessible, and manage defects through the same corrective-action system used for other safety equipment.
Train employees to recognise electrical incidents, raise the alarm, call 000, select the correct unit and decide when not to fight a fire. Include role clarity for authorised isolators, wardens, first aiders and contractors.
Maintain site-specific emergency information, including electrical single-line diagrams where appropriate, battery or solar isolation arrangements, emergency contacts and agreed access for the fire brigade. Review the plan after equipment changes or incidents.

Australian workplaces often combine older switchboards with newer rooftop solar, lithium tools and EV chargers, so one standard issue can become outdated quickly. In a warehouse outside Brisbane or a workshop in Perth, the nearest suitable unit may be in the wrong room or the wrong format. Regular walk-throughs, clear floor markings and realistic drills turn local conditions into planned decisions.

Make the next step an operational one. HCF CATCH can help teams build practical electrical-fire readiness through scenario-based training, extinguisher familiarisation and workplace emergency planning. Contact HCF CATCH to discuss a course, facility visit or tailored programme for your organisation and the electrical risks it works across.