A confined space is defined as a space with limited entry/exit and potential hazardous atmosphere; entry permit requirements are typically expected.

• A. A space with limited entry/exit and potential hazardous atmosphere; requires permit-to-work, atmospheric testing, and standby observers
• B. A space with ample entry/exit and no hazards
• C. A space used for storage of nonhazardous items
• D. A space that is always pressurized and well-ventilated

Answer: (A)

A confined space is controlled because entry is limited and the atmosphere inside can be hazardous, so formal procedures are used to manage the risk. The best answer states a space with limited entry/exit and a potential hazardous atmosphere and notes the typical controls: permit-to-work, atmospheric testing, and standby observers. This pair of features—restricted access and hazardous conditions—drives the need for an entry permit to ensure proper testing, isolation or ventilation, and rescue readiness before someone enters.

Why the others don’t fit: a space with ample entry/exit and no hazards isn’t a confined space by definition; a space used only for storage of nonhazardous items isn’t about hazardous atmospheres or restricted access; a space that is always pressurized and well-ventilated would generally not present the kind of hazardous atmosphere or access issues that require an entry permit.