Which class describes a space that has the potential for injury and illness if preventive measures are not taken, but is not immediately dangerous to life and health?

• A. Class D
• B. Class B
• C. Class C
• D. Class A

Answer: (B)

Think about how hazard levels in confined spaces are described. If a space could cause injury or illness unless you take preventive measures, but isn’t immediately dangerous to life or health, that represents a mid-level hazard. This is Class B. It means you must apply appropriate safety controls—such as atmospheric monitoring, ventilation, personal protective equipment, and a rescue plan—to prevent harm. The other levels describe spaces that pose greater immediacy of danger (immediate life threat) or minimal/no hazard, which don’t fit this scenario. So the description best matches Class B.