OSHA's definition of a confined space includes which of the following?

• A. A space large enough to enter and perform work; has limited or restricted means for entry or exit; is not designed for continuous occupancy
• B. A space with ventilation
• C. A space used for storage
• D. An open field

Answer: (A)

OSHA defines a confined space by three essential features that must all be present: it’s large enough to enter and perform work inside, it has limited or restricted means for entry or exit, and it’s not designed for continuous occupancy. When a space meets all three, it’s considered a confined space. The reason this option is best is because it states all three criteria clearly in one description, which is what OSHA uses to identify confined spaces.

The other ideas don’t alone establish a confined space. A space with ventilation doesn’t automatically become confined—ventilation can occur in many spaces that are not restricted or not designed for limited entry. A space used for storage might be enclosed, but if it’s designed for occupancy or doesn’t have restricted entry and exit, it isn’t a confined space. An open field is not enclosed at all, so it doesn’t meet the requirement of limited means of entry or exit.