The dry chemical fire extinguisher is used to extinguish what types of fires?

Dry chemical is used for class A fires (wood, paper, etc) , class B (burnng liquids- gasoline, alcohol, diesel, etc), class C fires, which are any fires involving electrical hazards, and there are special dry chemical extinguishers for class D fires- burning metals such as sodium, potassium, magnesium, titanium, aluminum. The class C rating on an extinguisher simply means that the firefighting material will not conduct electricity.