Class A fires are primarily caused by which of the following materials?

Class A fires are primarily caused by ordinary combustible materials such as wood, paper, cloth, and certain plastics. These materials are common in many environments, especially in construction sites, homes, and industrial settings. They burn easily and can produce embers that may lead to the spread of fire if not managed properly.

Understanding Class A fires is crucial for watchpersons at construction sites, as the presence of ordinary combustibles is often high, and these materials can ignite easily. Fire suppression strategies for Class A fires typically involve the use of water or certain types of foam to cool the burning material and extinguish the flames effectively, making it essential for personnel to be knowledgeable about the nature of such fires and how to respond appropriately.