If no sealing fitting is provided at the boundary between classified and non-classified areas, or if the lower portion of the fitting is not properly sealed with sealing compound, the entire system ______ as an explosion-proof system

If no sealing fitting is provided at the boundary between classified and non-classified areas, or if the lower portion of the fitting is not properly sealed with sealing compound, the entire system ______ as an explosion-proof system

• A. Does not meet the code
• B. Is code compliant
• C. Exceeds requirements
• D. Meets the standard

Answer: (A)

Explosion-proof ratings depend on a proper barrier between classified (hazardous) and non-classified areas. That barrier includes a sealing fitting and sealing compound to prevent flame or ignition from traveling through the boundary. If there’s no sealing fitting at that boundary, or if the lower part of the fitting isn’t sealed correctly, a flame path or vapor could slip into the safe area. Because of that, the system cannot be considered explosion-proof and does not meet the code. The other options would imply compliance or exceeding requirements, which isn’t the case when the boundary seal is missing or improperly done.

Explosion-proof ratings depend on a proper barrier between classified (hazardous) and non-classified areas. That barrier includes a sealing fitting and sealing compound to prevent flame or ignition from traveling through the boundary. If there’s no sealing fitting at that boundary, or if the lower part of the fitting isn’t sealed correctly, a flame path or vapor could slip into the safe area. Because of that, the system cannot be considered explosion-proof and does not meet the code. The other options would imply compliance or exceeding requirements, which isn’t the case when the boundary seal is missing or improperly done.