An accessible fire extinguisher of which rating is required on equipment?

• A. 10 BC
• B. 5 BC
• C. 2A10BC
• D. ABC

Answer: (A)

The key idea is understanding extinguisher ratings and what hazards you’re protecting against on equipment. On cranes and other mobile equipment, the common risks are flammable liquids (like diesel, hydraulic fluids) and electrical components. A BC-rated extinguisher is designed specifically for those kinds of fires, rather than for ordinary combustibles like wood or paper.

The “10” in 10 BC indicates the extinguisher’s capacity for B-class fires—it's sized to handle a moderate nearby fire involving flammable liquids before it runs out. The BC designation means it’s suitable for flammable liquids and electrical fires, which are the relevant hazards on machinery. An option with an A rating would imply capability against ordinary combustibles, which isn’t the primary concern on equipment. An ABC extinguisher would also work but is typically heavier and more than what’s required for this context.

So, choosing a fire extinguisher rated 10 BC provides adequate protection for the actual risks on equipment—flammable liquids and electrical fires—while staying practical for mounting on the machine.