What does Article 720 specifically cover about circuits?

Article 720 of the National Electrical Code specifically addresses circuits operating at less than 50 volts. This section outlines safety measures and installation requirements for these low-voltage circuits, which include not just the wiring methods but also the components allowed within them. The emphasis on circuits operating at lower voltages is crucial because these systems may carry less risk compared to higher voltage systems, yet they still require certain safeguards to ensure safety and functionality.

This article recognizes the importance of low-voltage applications in various settings, such as control circuits, signaling systems, and bell systems, and establishes parameters for their proper installation and maintenance. By focusing on low-voltage circuits, Article 720 plays a key role in promoting safe practices within electronic systems that often serve critical functions in buildings.

In contrast, the other options pertain to topics covered under different articles of the NEC. Fire alarm systems are detailed separately due to their specific requirements and safety standards, while communications circuits are covered under different provisions that address their unique characteristics. Critical operations systems are also addressed in another article that emphasizes safeguards for systems essential for life safety and continuity. Each of these areas has its own set of codes and standards, specifically tailored to the unique needs and risks they present.