OSHA 30 Hour Construction Program Practice Test

How many types of confined spaces are recognized in construction safety?

1. One type

2. Two types

3. Three types

4. Four types

The correct answer is: Two types

In the context of construction safety, confined spaces are categorized into two recognized types: "permit-required confined spaces" and "non-permit required confined spaces." A permit-required confined space is one that meets specific criteria, such as having the potential to contain hazardous atmospheres, having a potential for engulfment, or having an arrangement that could complicate an individual's ability to exit the space in the event of an emergency. These spaces require a permit for entry and must adhere to strict safety protocols, including monitoring for atmospheric hazards, ensuring proper ventilation, and having rescue plans in place. On the other hand, non-permit required confined spaces do not possess the characteristics that would require a permit for entry, though they can still present risks and require safety measures. These areas may still be confined but are deemed safe for entry without the complexities associated with hazardous conditions. Understanding these classifications is vital for ensuring the safety of workers who may need to enter confined spaces, as it helps define the necessary precautions and preparation needed based on the risks involved.