For NFPA 90A compliance, the interconnection between the FACP and the emergency function control appliance must avoid which class?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (C)

The interconnection between the Fire Alarm Control Panel and an emergency function control appliance is a life-safety path that must stay reliable and continuously supervised. Class C is avoided because it does not meet the required reliability and monitoring standards for these critical interconnections, which could leave emergency functions like elevator recall, door holds, or damper control unable to operate when needed. In practice, circuits used for these interconnections are designed to provide redundancy or proper supervision (Class A or Class B), ensuring the emergency functions activate or de-activate correctly during a fire or power issue.