Knowledge related to fire extinguishers

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**According to the standards GB4968-85 \"Classification of Fires,\" fires are divided into four categories: A, B, C, and D. Category A refers to fires involving solid materials； Class B refers to fires involving liquids and fusible solid materials ； Class C refers to gas fires ； Class D refers to metal fires. Others: Fires involving electricity. Selection of fire extinguishers: 1. For extinguishing Class A fires, water-based fire extinguishers, foam fire extinguishers, ammonium phosphate dry powder fire extinguishers, and halon fire extinguishers can be used. 2. For extinguishing Class B fires, foam fire extinguishers (chemical foam extinguishers are only suitable for extinguishing non-polar solvents), dry powder fire extinguishers, halon fire extinguishers, and carbon dioxide fire extinguishers can be used. 3. For extinguishing Class C fires, dry powder fire extinguishers, halon fire extinguishers, carbon dioxide fire extinguishers, etc. can be used. 4. To extinguish Class D fires, powder graphite fire extinguishers or specialized dry powder fire extinguishers can be used; dry sand or cast iron shavings can also be used as alternatives. 5. For extinguishing fires involving live electricity, dry powder fire extinguishers, halon fire extinguishers, carbon dioxide fire extinguishers, etc. can be used. Live electrical fires refer to those in which household appliances, electronic components, electrical equipment (such as computers, copiers, printers, fax machines, generators, motors, transformers, etc.), as well as wires and cables, remain electrified while on fire; fires caused by overhead or wall-mounted lighting fixtures, or by devices that can cut off power automatically in the event of a fire, should not be classified as live electrical fires.