What kind of extinguisher is most suitable for electrical fires?

For electrical fires, a CO2 (carbon dioxide) extinguisher is most suitable because it works by displacing oxygen around the fire and cooling the flames, effectively suffocating the fire without leaving any residue that would potentially damage electrical equipment. CO2 extinguishers are especially beneficial for fires involving live electrical equipment because they do not conduct electricity, making them safe to use on energized circuits.

Water-based extinguishers are ineffective and dangerous for electrical fires because water conducts electricity and can lead to electrocution or further spreading of the fire. Dry chemical extinguishers can be effective for electrical fires as well; however, their residue might pose a risk of damaging sensitive electronic equipment compared to CO2. Foam-based extinguishers are not appropriate for electrical fires, as they can also conduct electricity and are primarily designed for flammable liquid fires. This context highlights why CO2 is the best choice in this situation.