🔍 Key Concepts
• Fire classes by type of fuel involved, not by size of fire
• Metals like magnesium and sodium behave differently from ordinary combustibles, liquids, or electrical fires
• The type of extinguishing agent that works (or fails) on burning metals
đź’ Think About
• Ask yourself: Is burning magnesium an ordinary solid fuel like wood or paper, a flammable liquid, an electrical fire, or something else?
• Think about what happens if you spray water on burning magnesium—does it help or can it make things worse? What class covers that type of hazard?
• Which fire class is specifically associated with combustible metals rather than common solids, liquids, or energized equipment?
âś… Before You Answer
• Be sure you know Class A is for ordinary combustibles (wood, cloth, paper, etc.)
• Confirm that Class B is for flammable liquids and gases, and Class C involves energized electrical equipment
• Identify which class is defined for combustible metals such as magnesium, sodium, potassium, and aluminum powders