What are the four classes of fire according to NFPA?

What are the four classes of fire according to NFPA?

Classifying fire

• Class A: Ordinary combustible materials, such as wood, cloth, paper, rubber and many plastics.
• Class B: Flammable liquids (burn at room temperature) and combustible liquids (require heat to ignite).
• Class C: Fuels that would be A or B except that they involve energized electrical equipment.

What are Class B extinguishers?

Class B fires involve flammable and combustible liquids such as gasoline, alcohol, oil-based paints, lacquers. Therefore, extinguishers with a B rating are designed to extinguish fires involving flammable and combustible liquids.

What are the 4 elements of the fire tetrahedron?

Oxygen, heat, and fuel are frequently referred to as the “fire triangle.” Add in the fourth element, the chemical reaction, and you actually have a fire “tetrahedron.” The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.

How many classes of fire are there in NFPA?

In accordance with NFPA, areas are typically classified as being light (low) hazard, ordinary (moderate) hazard, or extra (high) hazard.

What Is in a Class B fire extinguisher?

Because of this, Class A fire extinguishers use water, while Class B fire extinguishers use dry chemicals (foam or powder), such as aqueous film-forming foam, multi-purpose dry chemicals such as ammonium phosphate, and halogenated agents (such as Halon 1301 and Halon 1211) or highly pressurized carbon dioxide.

What are the four classes of a fire?

Classes of Fires 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.

Which is an example of a Class B fire?

This is essentially the common accidental fire encountered across several different industries. Trash fires are one such example. Class A fires are commonly put out with water or monoammonium phosphate. Class B. The Class B fire is defined as one that uses a flammable liquid or gas as its fuel base.

What makes a cooking fire a Class K fire?

Cooking fires are fueled by a wide range of liquid cooking materials. Greases, cooking oils, vegetable fat, and animal fat are all fuel sources found in Class K fires. Class K fires are naturally of concern in the food service and restaurant industry.

What are the different types of cooking fires?

Note that cooking fires have their own classification and are defined as Class K fires. The Class C fire is defined as a fire that uses electrical components and/or energized equipment as its fuel source. Electrical fires are often fueled by motors, appliances, and electronic transformers.