For the classification of wiring between the fire alarm control unit and the emergency control function interface device, which of the following is NOT a valid Class option?

For the classification of wiring between the fire alarm control unit and the emergency control function interface device, which of the following is NOT a valid Class option?

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

Answer: (A)

Wiring classifications for the path between the fire alarm control unit and the emergency control function interface device define how the circuit behaves under fault conditions and what level of redundancy is required. The standard recognizes defined classes for this interface, including A, B, and D, each with its specific fault-tolerance approach. There is no defined Class Z in these classifications, so it isn’t a valid option.

Wiring classifications for the path between the fire alarm control unit and the emergency control function interface device define how the circuit behaves under fault conditions and what level of redundancy is required. The standard recognizes defined classes for this interface, including A, B, and D, each with its specific fault-tolerance approach. There is no defined Class Z in these classifications, so it isn’t a valid option.