What is the requirement for the door closing safety system?

• A. Non-functional
• B. Functional with periodic testing
• C. Functional
• D. Not required

Answer: (C)

The essential requirement is that the door closing safety system must be functional. Its purpose is to automatically close the door to maintain the safety barrier and prevent hazards from spreading when needed. If the system were non-functional, the door could stay open, defeating the safety barrier and increasing risk. While periodic testing is important for verifying continued performance, the fundamental requirement described here is that the system is capable of performing its safety role—that is, it is functional. The other options either imply no safety capability or add maintenance wording beyond the basic requirement.