California ICC UST Inspector Practice Exam

Which characteristic does NOT define a permit-required confined space?

1. Contains or has a potential to contain a hazardous atmosphere

2. Has potential for engulfing an entrant

3. Has internal configuration such that an entrant would be trapped

4. Oxygen-deficient atmosphere

The correct answer is: Oxygen-deficient atmosphere

A permit-required confined space is defined by specific characteristics that clearly outline the potential hazards associated with entering such spaces. The correct choice identifies a characteristic that is not part of those criteria. Oxygen deficiency is indeed a serious concern in confined spaces, but it does not exclusively or necessarily define a space as permit-required. A permit-required confined space can have various hazardous atmospheres, which may include toxic gases, vapors, and other harmful conditions, without being necessarily deficient in oxygen. The presence of an oxygen-deficient atmosphere is just one type of hazardous situation that might exist, but it does not alone encompass the broader definition of a permit-required confined space. Other characteristics mentioned, such as the potential for engulfment and the internal configuration that can trap entrants, are essential markers that distinguish these spaces as needing stringent safety regulations and permitting processes. They emphasize the importance of proper assessment and preparation before entry to ensure the safety of workers.