Which class of fire involves combustible metals such as magnesium and sodium?

The correct classification for fires involving combustible metals such as magnesium and sodium is Class D. Class D fires are specifically associated with reactive metals that can ignite and burn fiercely when exposed to heat or water. This class of fire requires specialized extinguishing agents that are designed to handle the unique characteristics of burning metals, which may react violently with water and other common firefighting agents.

Understanding Class D fires is crucial for firefighters because these metals do not extinguish like typical flammable materials. For instance, they cannot simply be doused with water or foam, as this could exacerbate the fire by creating a hazardous reaction. Instead, dry powder agents made specifically for Class D fires must be used to smother the flames and prevent combustion.

In contrast, Class A fires involve ordinary combustibles like wood and paper, Class B fires involve flammable liquids and gases, and Class C fires are concerned with electrical equipment. Each of these fire classes has distinct characteristics and requires different firefighting strategies and agents, highlighting the importance of properly identifying the fire class for effective fire prevention and response.