Answer :
Final answer:
A Pressurized Water fire extinguisher is designed to be used on Class A fires, which involve ordinary combustibles like wood and paper. It is not suitable for Class B or C fires due to the risk of spreading flammable liquids or causing electrical issues. Therefore, option A is the correct answer.
Explanation:
Understanding Pressurized Water Fire Extinguishers
A Pressurized Water (PW) fire extinguisher is primarily used for extinguishing class A fires, which involve ordinary combustibles such as wood, paper, and cloth. Class A fires are best tackled with water because it effectively cools down the burning materials.
To clarify the categories of fire extinguishers:
- Class A: Ordinary combustibles (wood, paper, cloth)
- Class B: Flammable liquids (gasoline, oils)
- Class C: Electrical fires (equipment and wiring)
- Class D: Combustible metals (magnesium, titanium)
- Class K: Cooking oils and fats
Using a PW extinguisher on classes B and C can be unsafe, as it may cause the fire to spread, especially with flammable liquids. Class D fires require special extinguishing agents because of the reactive nature of the metals involved, and class K fires necessitate extinguishers specifically designed for cooking oils.
Thus, the correct choice is:
- A. Class A
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