What is an example of a Class D fire?

A Class D fire involves combustible metals, specifically those that can catch fire and burn at a high temperature. Magnesium is a common example of a combustible metal that can ignite spontaneously or upon exposure to moisture or certain chemicals. The unique characteristics of Class D fires require special fire extinguishing methods, such as using dry powder agents specifically designed to combat metal fires, as water or other common extinguishing agents could exacerbate the situation.

The other choices represent different classes of fires: wood is associated with Class A fires, flammable liquids are categorized under Class B fires, and electrical fires fall under Class C. Each class has distinct properties and appropriate extinguishing methods, making it crucial for individuals to understand these differences, especially in safety and emergency situations.