Fires are divided into several classes.
* Class A Fires: These fires are caused by "normal combustibles," or things like paper, wood, and plastic.
* Class B Fires: These fires are caused by combustible liquids and flammable gases such as hydrogen, gasoline, and propane, among others.
* Class C Fires: These are electrical fires, often caused by a faulty circuit or a malfunction of some kind of electrical system. These can occur in microwaves and other appliances, as well as fuse boxes.
* Class D Fires: These fires result from the combustion of metals, including magnesium. The most common reason you might see this kind of fire in your day to day life would be fireworks, which utilize many types of combustible metal for their pretty colors.
* Class K Fires: These are grease fires caused by cooking oils and other fats, and are pretty common in kitchens.