What is the primary characteristic that defines a confined space according to OSHA terms?

The primary characteristic that defines a confined space according to OSHA terms is that it must be large enough to enter. This means that individuals can physically enter and work within the space, which is crucial for the identification and classification of confined spaces. The definition encompasses spaces that are not necessarily designed for continuous occupancy; in fact, many confined spaces are only intended for temporary access for maintenance, inspection, or operational activities.

While ventilation systems and natural light may be relevant factors in assessing the safety of a confined space, these elements do not fulfill the primary requirement for classification. A space can be large enough for entry but may lack proper ventilation or lighting, which can raise safety concerns but does not change its status as a confined space. Understanding this specific definition helps workers recognize the potential hazards associated with entering and working in confined areas, thus promoting safer practices and compliance with OSHA regulations.