What is the minimum number of sets of wires required by NFPA 99 to connect the initiating device with the junction box for each signal?

The minimum number of sets of wires required to connect the initiating device with the junction box for each signal, according to NFPA 99, is one. This requirement is based on the need for a reliable connection that allows for proper signaling between the initiating device (which could be a gas alarm or a similar device) and the junction box that will relay that signal to the appropriate monitoring systems.

Using a single set of wires minimizes complexity and reduces the potential points of failure in the signaling system. It is essential that the single wiring set is properly installed and maintained to ensure that signals are transmitted effectively, as this plays a critical role in maintaining safety and functionality in medical gas systems.

Having more than one set of wires for every signal is not a requirement according to NFPA 99; while additional wiring might be used in more complex systems or for redundancy, it is not mandated for basic connections as stated in the standard. This understanding helps ensure that designers and installers focus on operational efficiency while adhering to the code requirements.