What characteristic defines a confined space?

A confined space is primarily defined by its limited means of entry or exit. This characteristic is crucial because it affects safety and accessibility. In the context of work environments, a confined space often presents hazards due to its isolation and restricted ability to exit in emergency situations. For example, if a worker encounters a hazardous condition inside such a space, quick evacuation may be complicated by narrow openings or the lack of an immediate means of leaving.

The concept of limited access is significant in safety regulations and guidelines since it requires special precautions and permits for work in these environments, typically to ensure that personnel can safely enter and exit. Understanding the criteria that classify a space as "confined" is essential for safety professionals in risk assessment and management.

Other characteristics, such as being small enough to restrict movement or being open to natural light, do not solely define a confined space. A confined space may still allow for some movement but remains classified by its restricted access. Additionally, natural light is not a defining factor; many confined spaces may lack natural light entirely while still fitting the definition due to their limited entry-exit configurations.