Smoke Detector Placement: Where to Place ... - Safety.com Oct 10, 2019 · Fires that originate from flammable liquids and gas can be extinguished by a class B fire extinguisher. This is the type of extinguisher you’ll want to use on a fire caused by oil or fuel. Class C fire extinguishers. Class C fire extinguishers are effective against electrical fires from live wires, panels, and circuit breakers. The ...