🔍 Key Concepts

• Fire classes and what A, B, and C each represent (solids, flammable liquids, electrical) • How foam works to extinguish a fire (cooling and smothering the fuel surface) • Whether foam agents are conductive or non-conductive around energized electrical equipment

💭 Think About

• First, match each fire class (A, B, C) with its typical fuel type. Which types of fuel are foam agents most effective on? • Think about what happens if foam is sprayed on live electrical equipment—would that be safe, or is another extinguisher type preferred for Class C? • Compare foam with CO₂ and dry chemical agents: which of those are commonly used on electrical (Class C) fires, and which are more for solids and flammable liquids?

✅ Before You Answer

• Confirm which classes specifically involve flammable liquids and which involve energized electrical equipment • Check whether standard portable foam extinguishers are generally recommended or not recommended for Class C fires • Eliminate any option that includes a fire class where using water-based or conductive agents would be unsafe