What defines a non-permit confined space?

A non-permit confined space is defined as one that does not contain hazards that would necessitate a permit for entry. This means that the space is free from any atmospheric, physical, or health hazards that could pose a risk to workers entering or working within it. The characteristics of non-permit confined spaces are such that they can be entered without additional regulations or the stringent safety measures required for permit-required spaces.

For a confined space to qualify as non-permit, it must meet specific criteria, including having an oxygen concentration between 19.5% and 23.5%, lack of toxic gases or harmful contaminants, absence of any potential engulfment risks, and no physical hazards that could directly threaten workers. Therefore, the presence of these conditions qualifies the space as inherently safer, allowing for simpler entry and work procedures.

The other options address situations where hazards are present, either by indicating low oxygen levels, which are a concern, or by suggesting that a permit may be needed due to potential hazards. Additionally, storing hazardous materials typically implies risks that would require a permit, making those options inconsistent with the definition of a non-permit confined space.