Question

Which of the following types of fire extinguishers should not be used to extinguish an electrical fire?

• A. Carbon dioxide
• B. Mechanical foam
• C. Dry chemical powder
• D. ABC dry powder

Hint:

For electrical fires, use non-conductive fire extinguishers like carbon dioxide or dry powder. Avoid using foam-based extinguishers.

Answer 1

The Correct Option is B

For electrical fires, it's crucial to use fire extinguishers that do not conduct electricity. Carbon dioxide, dry chemical powder, and ABC dry powder extinguishers are safe for electrical fires, while mechanical foam should be avoided. Foam-based extinguishers can conduct electricity and increase the risk of electrical shock.
Step 2: Analyzing the options.

• (A) Carbon dioxide: Incorrect. Carbon dioxide is safe for electrical fires as it is non-conductive and works by displacing oxygen to suffocate the fire.
• (B) Mechanical foam: Correct. Mechanical foam is not suitable for electrical fires because it may conduct electricity and cause more damage.
• (C) Dry chemical powder: Incorrect. Dry chemical powder is safe for electrical fires and is widely used to put out such fires.
• (D) ABC dry powder: Incorrect. ABC dry powder is effective and safe for electrical fires, as it works by interrupting the chemical reaction of the fire.

Step 3: Conclusion.
Therefore, the correct answer is (B) Mechanical foam, as it should not be used on electrical fires due to its conductivity. Final Answer:} Mechanical foam.