How many classes of fire are there?

Answer 1

Five in America, Six in Europe/Australia.

American

Class A: Ordinary combustibles

Class B: Flammable liquids and gases

Class C: Electrical equipment

Class D: Combustible metals

Class K: Cooking oil or fat

European/Australasian

Class A: Ordinary combustibles

Class B: Flammable liquids

Class C: Flammable gases

Class E: Electrical equipment

Class D: Combustible metals

Class F: Cooking oil or fat