Ask a fire officer in any Indian city what starts most of the fires they attend and the answer is wiring: an overloaded socket board, a loose neutral in a meter room, an inverter charging in a cupboard, an AC compressor that has been running since March. An electrical fire is small when it starts and expensive when it finishes, and the wrong extinguisher turns a burnt switchboard into an electrocution.
This guide explains which extinguishers are safe on live electrical equipment in India, why “electrical” is not a class on an Indian label, what to keep next to a panel, a server rack, an inverter or an EV charger, and the one step to take before you pick up the extinguisher at all.
“Electrical” is not a class in India
IS 2190 groups fires by what is burning: A solids, B liquids, C gases, D metals, F cooking oil. Electricity is not fuel; it is the thing that lit the fuel. Once you cut the power, a burning panel is a Class A fire of plastic and insulation. So instead of a class, an Indian ISI label carries a separate line stating whether the extinguisher is suitable for use on live electrical equipment, and up to what voltage (1,000 V is typical for a portable unit). This comes from a dielectric test in IS 15683: the discharge is fired at a live plate and the current that leaks back through the stream is measured.
The American system calls electrical fires “Class C”, which is why half the internet says “use a Class C extinguisher”. On an Indian label, Class C means gas. Look for the electrical suitability line, not the letter.
Before the extinguisher: cut the power
If you can reach the MCB, the main switch or the plug without touching anything hot or going through smoke, switch it off first. Three things happen when you do: the fire stops being fed, the risk of shock disappears, and the fire becomes an ordinary Class A fire that any extinguisher in the building can handle. If the panel is the thing on fire and the switch is inside it, leave it and use a unit rated for live equipment from at least a metre away. Never use a water hose, bucket or wet cloth on anything that might still be live.
Which extinguishers are safe on electrical equipment
1. Clean agent: the best choice where the equipment is worth more than the fire
A clean agent extinguisher holds a gas such as HFC-236fa stored as a liquid. It discharges as a fine, non-conductive vapour that cools the fire and interrupts the reaction, then evaporates without a trace. It is rated A, B and C as well as safe for live equipment, so it is the one unit that covers everything in a server room, a control room, a hospital ward with monitors, a recording studio or a lab, and does no damage to anything it touches. The 4 kg and 6 kg clean agent units are the usual pick for a panel room; 2 kg units go next to a rack or a desk full of equipment.
2. CO2: no residue, and the standard next to a panel
A CO2 extinguisher discharges carbon dioxide gas that pushes the oxygen away from the fire. It does not conduct electricity and leaves nothing behind, which is why a 4.5 kg CO2 unit is the standard fixture next to an electrical panel, a DG control board, a lift machine room or a UPS. It is rated for Class B as well, so it also covers the oil in a transformer or a motor. Its limits: it is not rated for Class A, so wood or cable trays that have been burning for a while can relight after the gas disperses, and in a small closed room a full discharge displaces breathable air, so step out after using it. Hold the handle, never the horn; the horn frosts over and can take skin off.
3. ABC dry powder: safe, effective, messy
The ABC powder extinguisher in the corridor is also marked safe on live equipment up to 1,000 V, and it will put out a switchboard fire faster than anything else. The problem is afterwards. Mono ammonium phosphate powder is fine, slightly corrosive and gets into every vent, contact and fan. A single 4 kg discharge in a server room can write off more hardware than the fire did. Use it on a panel in a godown or a stairwell without hesitation; in a room full of electronics, reach for CO2 or clean agent first and keep the ABC as the backup.
Never on live equipment
- Water, including water mist unless the label specifically says it is tested for electrical use. Ordinary tap water conducts, and the stream carries the current back to you.
- Foam, which is mostly water.
- Wet chemical (K-type), a potassium solution that conducts.
- A fire blanket on a live appliance is fine (it is wool or glass fibre), but pull the plug first if you can.
Which unit for which room
| Location | Keep | Why |
|---|---|---|
| Meter room, main panel, DG control board | 4.5 kg CO2 (plus ABC at the door) | No residue, rated B for transformer or DG oil |
| Server room, data centre, network rack | 4 or 6 kg clean agent; modular clean agent above the racks | Covers A, B, C and electrical with zero damage |
| Office floor with desktops and printers | ABC in the corridor, 2 kg CO2 or clean agent near the equipment | Corridors need A rating; electronics need no residue |
| Inverter, UPS and battery room | CO2 for lead-acid; lithium-ion extinguisher for Li-ion packs | A lithium cell in thermal runaway needs a cooling agent, not just gas |
| EV charger, e-scooter parking | Lithium-ion unit at the charger, ABC nearby | Battery fires relight; the agent must cool the pack |
| Home: switchboard, inverter, AC | 2 kg ABC near the kitchen door; 2 kg CO2 if there is a home office | One ABC covers a home; CO2 saves the laptop |
| Lift machine room, pump room | 4.5 kg CO2 | Motors and starters, no cleanup |
| Cable trays, cable cellar, unattended rooms | Ceiling-mounted modular unit (ABC or clean agent) | Releases on its own at about 68 °C when nobody is there |
Mount the unit outside the panel room or next to its door, never behind the panel, so you are not reaching past the fire to get it. IS 2190 asks for the top of the handle at no more than 1.5 metres from the floor and a travel distance of 15 metres for ordinary risks.
Lithium-ion fires are a different problem
An e-scooter, a laptop bank, a UPS with lithium cells or a car charger can produce a fire that CO2 and powder only pause. A lithium cell in thermal runaway generates its own oxygen and heat, so when the gas disperses the next cell goes. A lithium-ion extinguisher uses an agent that cools the pack below the runaway temperature and forms a barrier over it, which is the only thing that stops the chain. If your society or office has an EV charger, this is the unit that belongs next to it, with a CO2 or ABC for everything else around it.
Six things that prevent most electrical fires
- One appliance per socket for heaters, geysers, ACs and microwaves. Extension boards are for phones, not for 2 kW loads.
- An ELCB or RCCB on the main board, tested with its test button once a month.
- Inverters and battery banks on a ventilated stand, not inside a closed cupboard.
- A thermal check of the meter room and main panel once a year; a loose neutral shows up hot long before it shows up as smoke.
- No charging of e-scooters, drills or power banks on a bed, sofa or carpet, and no charging overnight in a passage that is the only exit.
- Replace old aluminium wiring and cloth-covered flex; they are behind a large share of fires in older buildings.
Frequently asked questions
Which fire extinguisher is used for electrical fire?
CO2 or clean agent, because both are non-conductive and leave no residue. ABC dry powder is also marked safe for live equipment and works well, but the powder must be cleaned off everything afterwards. Never water, foam or wet chemical on anything that may be live.
Is a Class C fire extinguisher for electrical fires?
Only in the American system. In India and on ISI labels, Class C is a gas fire. The label line to look for is “suitable for use on live electrical equipment”, with a voltage next to it.
Can you use water on an electrical fire?
Not while the equipment is live: the stream conducts the current back to you. Once the power is off at the main switch, the fire is an ordinary Class A fire and water or any other extinguisher is fine.
What type of fire extinguisher is used in a server room?
Clean agent, because it is rated for Class A (cables, paper) as well as electrical and does no damage to the equipment. Larger server rooms also use ceiling-mounted modular clean agent units above the racks for after-hours cover.
Which extinguisher for an electrical panel?
A 4.5 kg CO2 unit mounted by the panel room door, with an ABC unit nearby for anything that spreads to the walls or cable trays.
Is an ABC extinguisher safe for electrical fires?
Yes, up to the voltage printed on the label, usually 1,000 V. The powder is non-conductive. The only reason to prefer CO2 or clean agent is the cleanup afterwards.
Standards referenced: IS 2190 and IS 15683 from the Bureau of Indian Standards. Electrical wiring rules in India follow IS 732 and the National Building Code, Part 8.
Not sure whether your panel room needs CO2 or clean agent? Send a photo on WhatsApp and we will tell you what to mount and where, or compare every type in our guide to fire extinguisher types in India.