Class A, Class N, and Class X circuit conductors may be run together to a single appliance in a room not exceeding how many square feet?

Class A, Class N, and Class X circuit conductors may be run together to a single appliance in a room not exceeding how many square feet?

• A. 800 ft2
• B. 1200 ft2
• C. 1000 ft2
• D. 2000 ft2

Answer: (C)

When multiple fire alarm circuit types (Class A, Class N, and Class X) are routed to feed a single device, the code allows doing this only in rooms that are 1000 square feet or less. The idea behind this limit is to keep the wiring and the device manageable and easy to troubleshoot: in a smaller space, mixing different circuit classes to one appliance reduces complexity, helps control voltage drop and fault conditions, and keeps all wiring, access, and service within a single, accessible area. If the room were larger than 1000 ft², it would be better to use separate devices or separate circuits to maintain reliability and ease of maintenance. So the maximum room size for combining those conductors to one appliance is 1000 square feet.

When multiple fire alarm circuit types (Class A, Class N, and Class X) are routed to feed a single device, the code allows doing this only in rooms that are 1000 square feet or less. The idea behind this limit is to keep the wiring and the device manageable and easy to troubleshoot: in a smaller space, mixing different circuit classes to one appliance reduces complexity, helps control voltage drop and fault conditions, and keeps all wiring, access, and service within a single, accessible area. If the room were larger than 1000 ft², it would be better to use separate devices or separate circuits to maintain reliability and ease of maintenance. So the maximum room size for combining those conductors to one appliance is 1000 square feet.