When are confined space entrants required to exit the space?

Entrants in a confined space must exit when they detect prohibited conditions because their safety and health are significantly at risk in such environments. Prohibited conditions can include hazardous atmospheres, such as the presence of toxic gases, inadequate oxygen levels, or the risk of engulfment. Detecting these hazardous conditions indicates an immediate threat, making it essential for entrants to evacuate promptly to avoid serious injury or fatality.

While other scenarios like shift changes, alarms, or supervisor instructions can lead to exiting the space, they do not necessarily pertain to imminent danger. Detection of prohibited conditions directly points to unsafe environments that require immediate action, underscoring the importance of recognizing and responding to hazards without delay.