What type of fire extinguishing agent is typically used on electrical fires?

The use of carbon dioxide (CO2) or dry chemical agents for extinguishing electrical fires is based on their effectiveness in displacing oxygen and interrupting the chemical reaction of combustion without conducting electricity. CO2 works by creating a blanket of gas that suffocates the fire, particularly effective in confined spaces where electrical equipment may be present. Dry chemical agents also serve dual purposes; they not only interrupt the combustion process but are non-conductive, ensuring safe use in situations involving live electrical components.

In contrast, water is a common extinguishing agent for many types of fires but is inappropriate for electrical fires because water is a conductor of electricity and can pose a significant risk of shock or further damage to electrical systems. Foam agents are generally utilized for flammable liquid fires and may not entirely extinguish electrical fires, as they can also conduct electricity. Class K agents, specifically designed for cooking oil and fat fires, do not apply to electrical fires and are not suitable for this type of hazard. Thus, carbon dioxide and dry chemical agents are the safest and most effective choices for tackling electrical fires.