What fire extinguishers are required on site?

• A. 15-20 lb Class ABC and 7-10 lb Class BC
• B. 5-10 lb Class A and 5-10 lb Class B
• C. 20-25 lb Class AB and 5-10 lb Class BC
• D. 10-15 lb Class ABC and 10-20 lb Class BC

Answer: (A)

The main idea here is ensuring fire extinguishers provide broad protection for the hazards you’re likely to encounter on a site, with sizes chosen for effective use and reach. Fire extinguishers that cover Class A, B, and C hazards give you versatility: A handles ordinary combustibles like wood and paper, B covers flammable liquids, and C is for electrical fires. An ABC extinguisher combines all three capabilities in one unit, which is practical for general areas on a site.

Having a larger 15-20 lb ABC extinguisher gives substantial capacity for tackling bigger or spreading fires in common work zones, so you’re not limited by small units during an initial response. A smaller 7-10 lb BC extinguisher focuses on electrical fires and some B hazards, is lighter to carry, and is suitable for placement near electrical equipment where quick access is crucial. This pairing ensures you can respond to a wide range of fires efficiently while keeping some units dedicated to electrical-specific needs.

Other options either miss coverage for certain hazard types (like not addressing ordinary combustibles) or rely on sizes that aren’t as practical for on-site reach and use.