Which PPE level is non-encapsulated and non-permeable with SCBA?

• A. Level B
• B. Level A
• C. Level D
• D. Level C

Answer: (A)

The main idea here is the level of protection provided by the PPE. The highest protection level uses a fully encapsulating, vapor-tight suit that is non-permeable to chemicals, with a self-contained breathing apparatus (SCBA) worn inside the suit. This combination creates a complete barrier: no vapors or liquids can reach the wearer, and the wearer breathes uncontaminated air from the SCBA. That’s why this level is considered the best choice when the atmosphere is unknown or highly hazardous.

Other options offer less protection. A non-encapsulating suit with SCBA provides splash protection but does not seal against vapors, so contaminants could still reach the wearer. A system using air-purifying respirators (rather than an SCBA) depends on ambient air and is not suitable for unknown or highly toxic atmospheres. Standard work clothes provide minimal protection.