What type of fire extinguisher should be used to combat electrical fires?

The use of a dry chemical extinguisher for combating electrical fires is based on its effectiveness in suppressing such fires without the risk of conducting electricity. These extinguishers typically contain agents such as monoammonium phosphate or sodium bicarbonate, which work by interrupting the chemical reaction of the fire and cooling the burning material. Importantly, dry chemical extinguishers can safely extinguish electrical fires, as they are designed to be non-conductive.

In contrast, water extinguishers, while effective for other types of fires, should never be used on electrical fires because water is a conductor of electricity and can lead to electrocution. A foam extinguisher is also inappropriate for electrical fires as it can conduct electricity and cause further hazards. Class D extinguishers are specially designed for combustible metals and do not address electrical fires effectively. Thus, the dry chemical extinguisher is the appropriate choice for addressing electrical fires, ensuring both safety and effectiveness in extinguishing the flames.