In confined spaces, what defines a permit-required confined space?

• A. A space with or potential to contain hazardous atmosphere, or other hazards requiring permit.
• B. A space that is too small to enter.
• C. A space with only physical hazards.
• D. A space that is outdoors.

Answer: (A)

Permit-required confined spaces are spaces that must be entered only under a formal permit because they pose hazards that need controlled precautions. The defining factor is that the space either contains or could contain a hazardous atmosphere, or has other hazards that require a permit to manage entry safety. This is exactly what the description conveys: a space with or potential to contain a hazardous atmosphere, or other hazards requiring a permit. The other ideas—being too small to enter, being outdoors, or having only physical hazards—do not capture the need for a permit. Size or outdoor location doesn’t determine permit status, and while physical hazards can be serious, the permit-required designation centers on hazardous atmospheres or other hazards that mandate the permit and accompanying safety measures.