What defines a "permit-required confined space"?

A "permit-required confined space" is defined by the presence of hazardous conditions that could pose a risk to individuals entering or working within that space. This includes atmospheres that may be oxygen-deficient, flammable, or toxic, as well as the presence of materials that can engulf an entrant, such as liquids or loose solids. The requirement for a permit arises because specific safety measures must be implemented to protect workers from these hazards, making it imperative to monitor and assess the risks before entry.

Options that reference adequate ventilation, spaces without hazards, or spaces designed for continuous work do not capture the essential criteria needed to classify a confined space as permit-required. A space with adequate ventilation might mitigate some risks but does not inherently eliminate all hazards. Similarly, a confined space without hazards does not necessitate a permit, and a space designed for continuous work does not specifically address safety concerns related to confined space entry. Therefore, the defining characteristic that mandates a permit is the existence of hazardous atmospheres or materials capable of causing harm.