ASTTBC RFPT — Portable Fire Extinguishers (EX) · Question
Which of the following extinguisher types is strictly prohibited for use on a Class C fire due to the risk of electrical conductivity to the operator?
NFPA 10, Section 5.3.3.1 states that extinguishers containing water-based agents (like AFFF or FFFP) shall not be used on energized electrical equipment (Class
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Question: Which of the following extinguisher types is strictly prohibited for use on a Class C fire due to the risk of electrical conductivity to the operator?
Answer options:
- Carbon Dioxide (CO2) ✅ Water Film Forming Foam (AFFF)
- Dry Chemical (Monoammonium Phosphate)
- Halon 1211
Correct answer: Water Film Forming Foam (AFFF)
Explanation: NFPA 10, Section 5.3.3.1 states that extinguishers containing water-based agents (like AFFF or FFFP) shall not be used on energized electrical equipment (Class C) as they are conductive.
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