🔍 Key Concepts

• Class C fires (energized electrical equipment) and which agents are safe to use on them • Class D fires (combustible metals like magnesium, sodium, aluminum) and why they are special • Limitations of common fixed fire-extinguishing systems (CO₂, Halon, water, foam)

💭 Think About

• For each fire class mentioned (C, D, flammable gas), think: which agents are recommended, which are dangerous, and which are ineffective? • Ask yourself: are flammable gas fires usually put out immediately, or is there a reason controlled burning until shutoff is sometimes preferred? • Consider whether standard shipboard fixed systems are designed to handle metal fires, or if those generally need special-purpose dry powders.

✅ Before You Answer

• Verify how CO₂ and Halon are classified for use on electrical (Class C) fires and whether BOTH are appropriate in shipboard context. • Check whether standard fixed systems are normally used on flammable gas fires, or if procedure focuses on shutting off the fuel and controlling spread. • Confirm if typical fixed systems (CO₂, foam, water) are generally effective or ineffective on Class D combustible metal fires, and why.