Which class of fire extinguisher is generally appropriate for electrical and welding-related fires, and how should extinguishers be used?

• A. Class ABC extinguishers (multipurpose) or Class C for electrical.
• B. Class B extinguishers.
• C. Class D extinguishers.
• D. No extinguisher is necessary.

Answer: (B)

In welding environments where electrical equipment and possible flammable residues are present, a multipurpose extinguisher that covers A, B, and C hazards is the best fit. These ABC-rated extinguishers handle ordinary combustibles, flammable liquids, and energized electrical equipment, which covers most situations you’ll encounter around welding and electrical work. If you know the fire is electrical and it’s safe to do so, a Class C (or an ABC extinguisher that is also rated for C) is appropriate because it won’t conduct electricity and is safe to use on energized gear once power is secured.

When using any extinguisher, follow the basics: pull the pin, aim at the base of the fire, squeeze the handle, and sweep the nozzle from side to side to coat the fuel at its source. Keep a clear path to an exit and move back if the fire cannot be controlled quickly. Remember, never use water on electrical fires; if possible and safe, shut off the power first. For fires involving burning metals, use the correct Class D extinguisher if available.