Foam and water type extinguishers must not be used to extinguish which fires?

Foam and water type extinguishers must not be used to extinguish which fires?

• A. Electrical
• B. Chemical
• C. Metal
• D. Wood

Answer: (A)

Water-based extinguishing agents like foam and water are conductive, so using them on live electrical equipment creates a real shock risk for the operator and can energize the extinguisher stream, potentially spreading current and damaging equipment. That danger makes foam and water unsuitable for electrical fires, even though they can be effective on many other fire types. For electrical fires, non-conductive extinguishing options such as certain dry chemical powders or clean agents are preferred, after ensuring the area is safe to approach. So the key point is: avoid foam and water on fires involving energized electrical equipment due to the risk of electrocution and equipment damage.

Water-based extinguishing agents like foam and water are conductive, so using them on live electrical equipment creates a real shock risk for the operator and can energize the extinguisher stream, potentially spreading current and damaging equipment. That danger makes foam and water unsuitable for electrical fires, even though they can be effective on many other fire types. For electrical fires, non-conductive extinguishing options such as certain dry chemical powders or clean agents are preferred, after ensuring the area is safe to approach. So the key point is: avoid foam and water on fires involving energized electrical equipment due to the risk of electrocution and equipment damage.