What material should NOT be used to extinguish electrical fires?

Using water to extinguish electrical fires is highly dangerous because water is a conductive material. When water comes into contact with live electrical equipment, it can create a pathway for electricity to flow, which increases the risk of electric shock to the person attempting to extinguish the fire. This is particularly true in environments where electrical fires may occur, as the interaction between water and energized circuits can lead to severe injuries or even fatalities.

In contrast, the other extinguishing agents mention—foam, dry chemical, and CO2 extinguishers—are suitable for electrical fires. Dry chemical and CO2 extinguishers are non-conductive, helping to safely extinguish fires without the risk of electrical shock. Foam extinguishers are also designed for specific types of fires, but they should be used with caution around live electrical equipment due to the potential for conductivity in certain cases. However, the general rule remains to avoid using water for electrical fires.