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Which of the following statements pertaining to fire suppression systems is TRUE?
Correct Answer: D
Explanation/Reference: Explanation: Class C fires are electrical fires which that may occur in electrical equipment or wiring. Class C fire extinguishers use gas, CO2 or dry powders. These extinguishing agents are non-conductive. Class A fire extinguishers use water or foam. Water or foam used on an electrical fire would conduct the electricity and make the fire worse. Therefore, it is TRUE that water-based extinguishers are NOT an effective fire suppression method for class C (electrical) fires. Incorrect Answers: A: Halon is NOT the most common choice as far as agents are concerned. Halon is now known to be dangerous and no longer produced. Therefore, this answer is incorrect. B: Gas masks DO NOT provide an effective protection against use of CO2 systems. CO2 systems work by removing the oxygen from the air. Therefore, this answer is incorrect. C: CO2 systems ARE effective because they suppress the oxygen supply required to sustain the fire. Therefore, this answer is incorrect. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 472