Class 5 Boiler Practice Exam

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What equipment is typically used to extinguish electrical fires?

Water extinguisher
Foam extinguisher
CO2 extinguisher
DCP extinguisher

The correct answer is: CO2 extinguisher

The use of a CO2 extinguisher to extinguish electrical fires is appropriate because carbon dioxide displaces oxygen, which is essential for combustion. This type of extinguisher is advantageous for electrical fires as it does not conduct electricity, making it safe to use on live electrical equipment. CO2 extinguishers also leave no residue, which is beneficial in minimizing damage to sensitive electronic devices. In contrast, water extinguishers can conduct electricity and pose a significant risk when used on electrical fires. Foam extinguishers are also not suitable for electrical fires, as they can conduct electricity and may cause further danger. DCP (Dry Chemical Powder) extinguishers can be used on electrical fires, but their effectiveness may vary depending on the specific type of dry chemical used. Overall, the efficacy and safety of the CO2 extinguisher make it the best choice for tackling electrical fires.