Classes of fires

1) Class A Fires Fires arising mainly because of paper, wood, textiles etc. are known as Class A fires. The use of foam extinguishers, water pumps, water sprays, and gas cartridges etc. is recommended to fight Class A fires. Further, experts are of the opinion that almost any type of extinguisher is satisfactory for such fires. 

2) Class Fires Such fires are due to fuels such as oil, fat, grease, organic solvent, paint etc. and the use of dry-chemical, liquid, C02, or foam extinguishers is recommended. 

3) Class C Fires These are electrical fires in equipment and electrical gadgets where live electricity is present. The material that burns is the insulation and component parts. The use of only C02 or dry-chemical fire extinguishers is recommended. 

Caution Do not use water or foam extinguishers The persons involved may become part of the electrical circuit and get electrocuted. 

4) Class D Fires Fires as a result of sodium, potassium, magnesium, lithium, zirconium and all metal hydrides come under this category. The use of dry soda ash fire extinguishers, sodium chloride, dry sand or graphite is recommended to fight such fires. 

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In volume terms the most important class of fire retardants are the phosphates. Tritolyl phosphate and trixylyl phosphate are widely used plasticisers which more or less maintain the fire-retarding characteristics of PVC (unlike the phthalates, which reduce the flame resistance of PVC products). Better results are, however, sometimes obtained using halophosphates such as tri(chloroethyl) phosphate, particularly when used in conjunction with antimony oxide, triphenyl stibine or antimony oxychloride. 

The three classes of fire are A those started from wood paper or rags B those started from oil, grease, or flammable liquids C those initiated by electricity. 

The extinguisher label gives operating instructions and identifies the class, or classes, of fire on which the extinguisher may be used safely. Approved extinguishers also carry the labels of the laboratories at which they were tested. 

Metal and Gas Fires. Such fires have not yet been classified. These require special agents and techniques. For a discussion of extinguishing agents and techniques for these classes of fire see p 206... 

Classes of Fires, Fire Extinguishers and Fire Fighting... 

Identify the type of fire extinguisher available in your laboratory. On what classes of fires should it be used Record the steps needed to use the fire extinguisher. 

Type of Hazard Class of Fire Recommended Extinguisher Agents... 

Four classes of fire and choosing right extinguisher. 

Four requirements for combustion, classes of fire, fireproof contain ers, grounding, alarms, exits, elevators, extinguishers, and hoses and hydrants. 

Drying time Moister resistance Class of fire-resistance (Life Safety Code, NFPA 101)... 

Ord nauioe. A class of fire-arms too large to be fired from the Mrsoii. See Cannon Mortar Battery-gun Howitzer etc. See list under Weapons. 

Fire extinguishers must match the type and class of fire hazards associated with the particular laboratory. Four fire hazard classes are defined by the U.S. Department of Labor Classes A, B, C and D. 

Table 1.3 shows the portable extinguishers most suited to each class of fire. 

Other fire protection features/issues AH forklifts have fire extinguishers attached for the class of fire hazard applicable to the fuel and energy sources of the forklift. ... 

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