Using the wrong type of fire extinguisher can make a fire worse or endanger the person using it. For example, water on an electrical fire creates a lethal shock risk, and water on a burning oil fire causes explosive flashover. Knowing which extinguisher to use and when it is safe to fight a fire is essential knowledge for every construction worker. This talk explains the main extinguisher types and their correct application.
Key Hazards
Using water on an electrical fire creating an electrocution risk
Using water on a flammable liquid fire causing explosive spread
Delayed evacuation from attempting to fight a fire beyond control
Extinguisher malfunction due to lack of maintenance or inspection
Control Measures
Learn the colour coding: red for water, cream for foam, black for CO2, blue for dry powder.
Use water extinguishers only on Class A fires involving solid combustible materials like wood and paper.
Use CO2 extinguishers on electrical fires and small Class B flammable liquid fires.
Use foam extinguishers on Class B flammable liquid fires and some Class A solid fuel fires.
Never fight a fire that is beyond the capacity of a single extinguisher or that blocks your escape.
Ensure fire extinguishers are serviced annually and inspected monthly by a trained person.
Position extinguishers on designated stands near fire risk areas and along escape routes.
Pull the pin, aim at the base of the fire, squeeze the lever, and sweep side to side.
Evacuate immediately if the fire does not reduce after using one extinguisher.
Remember
Know the colour coding: red for water, cream for foam, black for CO2, blue for powder
Never use water on electrical fires or on burning flammable liquids
Only fight a small fire if it is safe to do so and your escape route is clear
Aim the extinguisher at the base of the fire, not at the flames above
Evacuate immediately if the fire does not go out after using one extinguisher
Applicable Legislation: Regulatory Reform (Fire Safety) Order 2005 · BS 5306-3 (Commissioning of Portable Fire Extinguishers) · Health and Safety at Work etc. Act 1974