What is meant by 'permit-required confined space'?

A 'permit-required confined space' refers to confined spaces that present specific hazards which necessitate the implementation of a permit system before entry is permitted. This classification is essential for maintaining safety and health standards in environments that might expose workers to potential risks, such as toxic atmospheres, oxygen deficiency, or other physical hazards. The permit system ensures that prior to entering, a thorough assessment is made, and proper safety precautions are established, including monitoring atmospheric conditions, ensuring ventilation, and providing necessary safety gear.

In contrast, the other options do not accurately describe the definition. Regular maintenance of a confined space does not inherently indicate the need for a permit, as not all maintained spaces are deemed hazardous. Furthermore, entering a confined space without supervision contradicts safety protocols; supervision is often critical in monitoring safety measures. Lastly, classifying a space simply as a 'small room' overlooks the specific factors that make a space 'permit-required', such as the presence of hazards that necessitate additional safety measures.