Class A fires involve which materials?

Class A fires involve which materials?

• A. Fuel oil
• B. Electrical wiring
• C. Plastic materials
• D. Paper and wood

Answer: (D)

Class A fires involve ordinary combustibles—solid materials that burn and usually leave ash. Paper and wood are classic examples of these fuels, so they define this category. They burn steadily and are effectively cooled with water, which removes the heat and stops the fire from continuing to burn. Fuel oil is a liquid fuel, which places it in the Class B category. Electrical wiring involves live electrical equipment, which is Class C (electrical fires). Plastics can burn as well, but they’re not the standard example given for Class A in many training contexts. So, the reason paper and wood fit Class A is that they’re typical everyday solid fuels that burn to ash and are best extinguished by cooling with water.

Class A fires involve ordinary combustibles—solid materials that burn and usually leave ash. Paper and wood are classic examples of these fuels, so they define this category. They burn steadily and are effectively cooled with water, which removes the heat and stops the fire from continuing to burn.

Fuel oil is a liquid fuel, which places it in the Class B category. Electrical wiring involves live electrical equipment, which is Class C (electrical fires). Plastics can burn as well, but they’re not the standard example given for Class A in many training contexts.

So, the reason paper and wood fit Class A is that they’re typical everyday solid fuels that burn to ash and are best extinguished by cooling with water.