NFPA 70 requires what minimum number of sets of wires to connect the initiating device with the junction box for each signal?

NFPA 70 requires what minimum number of sets of wires to connect the initiating device with the junction box for each signal?

• A. 4
• B. 3
• C. 1
• D. 2

Answer: (C)

NFPA 70 treats each signaling path as a single circuit from the initiating device to the rest of the system. For that basic connection, only one set of conductors is required to carry the signal from the initiating device into the junction box and onward. Additional sets would be used only for redundancy or separate circuits, not for the minimum wiring of one path. So the minimum number of sets of wires is one. The conductors within that set must be appropriately sized and installed per code for a fire alarm signaling circuit, with proper terminations at the device and in the junction box.

NFPA 70 treats each signaling path as a single circuit from the initiating device to the rest of the system. For that basic connection, only one set of conductors is required to carry the signal from the initiating device into the junction box and onward. Additional sets would be used only for redundancy or separate circuits, not for the minimum wiring of one path. So the minimum number of sets of wires is one. The conductors within that set must be appropriately sized and installed per code for a fire alarm signaling circuit, with proper terminations at the device and in the junction box.