The reference 29.11.2.1 (3) KEY: smoke alarms sub interconnection of pertains to which fire alarm feature?

• A. Interconnection of supervised smoke alarms
• B. Interconnection of heat detectors
• C. Interconnection of visual notification appliances
• D. Interconnection of fuel systems

Answer: (A)

Interconnection in a fire alarm system is about linking multiple devices so that when one detects smoke, the others alarm as well, providing broader warning. The emphasis of this reference is that the interconnection must be between supervised smoke alarms. Supervision means the interconnect circuit and each connected smoke alarm are monitored by the system for power, fault, and communication status, so any problem in the interconnect is reported and doesn’t go unnoticed. That’s why this option is correct: it specifies the interconnection of supervised smoke alarms, which is exactly what the code reference addresses. The other options describe interconnections for different device types, but the referenced provision focuses on supervised smoke alarm interconnection.