Dry Powder Fire Extinguishers can be used on Class A, B,C and electrical fires and are very quick and effective at putting fires out. You have to be careful the fire is completely put out when using a Powder extinguisher as it only removes the oxygen element from the fire, so the residual heat may re-ignite the fire. The main problem with these extinguishers is the powder, which can cause breathing difficulties, causes a ‘fog’ which can hinder evacuation and is also extremely messy to clear away. British Standards no longer permit ABC Powder Extinguishers to be used in offices and living accommodation due to this problem. ABC Powder extinguishers are therefore only recommended for use in well-ventilated areas.
There is also a BC Powder Extinguisher, specifically manufactured for use in vehicles.