For electrical fires, a Class C fire extinguisher is needed to put out the flames. This is because electrical fires involve energized electrical equipment, and extinguishers with a C rating are designed for use with fires involving such equipment. It is important to note that water-based extinguishers should not be used on electrical fires, as there is a high risk of electrocution since water is conductive. Instead, substances that are non-conductive, such as monoammonium phosphate, potassium chloride, or potassium bicarbonate, are used in Class C fire extinguishers. Carbon dioxide (CO2) extinguishers are also effective for electrical fires, as they smother the fire with carbon dioxide and cut off the oxygen that would otherwise feed the fire and cause it to spread. CO2 extinguishers are also suitable for use on flammable liquids, such as petrol and paraffin.