There are four classes of fires: Class A: Ordinary solid combustibles such as paper, wood, cloth and some plastics. Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering. Class C: Electrical equipment, appliances and wiring in which the use or a nonconductive extinguishing agent prevents injury from electrical shock.
The A, B, C rating system defines the kinds of burning materials each fire extinguisher is designed to fight. The number in front of the A, B, or C indicates the rating size of fire the unit can extinguish. To achieve a Class “A” rating, the extinguisher must be capable of putting out the wood crib, wood panel and excelsior (shredded paper) tests.
Fire Extinguishers Class A, B, C, D & K | Critical Tool
There are 5 different Fire Classes and extinguishers are labeled to meet these individual classes. Fire Extinguisher Classes Include: Class A: Ordinary Combustibles like Wood, Paper and Cloth; Class B: Flammable Liquids like Grease, Oil, Paint and Solvents; Class C: Live Electrical Equipment like Electrical Panels, Motors and Wiring
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What is a Class “A” fire extinguisher?
To achieve a Class “A” rating, the extinguisher must be capable of putting out the wood crib, wood panel and excelsior (shredded paper) tests. Ratings are based on the size of the material that can be repeatedly extinguished.
What chemicals are used in a Class B fire extinguisher?
The primary chemical used to fight these fires is monoammonium phosphate, because of its ability to smother fires in these types of materials. Fire extinguishers with a Class B rating are effective against flammable liquid fires. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited.
What is an A-B-C fire extinguisher?
For example, A-B-C fire extinguishers can be used for all three of these types of fires. They can also cover other combinations of fire types, such as A-B or B-C, depending on the extinguisher. Carbon dioxide is used in multi-purpose fire extinguishers. This gas takes the place of the fire’s oxygen, breaking the chemical reaction.
Do not use Class B fire extinguishers in the hospital?
Do not use on Class B or C fires; may cause fire spread or electrical shock. ABC fire extinguishers are located throughout the Medical Centers in corridors. Specialty areas, such as the Operating Rooms and Kitchens have specific extinguishers.
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TYPES OF FIRE AND FIRE EXTINGUISHERS | WHICH FIRE EXTINGUISHER TO BE USED ON WHICH CLASSES OF FIRE Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher