What does Article 720 specifically cover about circuits?

Article 720 of the National Electrical Code (NEC) is specifically focused on circuits that operate at less than 50 volts. This article outlines the requirements for these low-voltage circuits, emphasizing safety measures and installation practices necessary to minimize risks like electric shock and fire hazards.

Low-voltage applications often include various systems such as control circuits, signal circuits, and other applications that do not pose the same risks as higher-voltage installations. By providing guidance on the design and implementation of these circuits, Article 720 helps ensure that they are utilized safely and effectively in a variety of settings, including residential, commercial, and industrial applications.

While the other options mention important aspects related to electrical installations, they fall under different sections of the NEC. Fire alarm systems, communications circuits, and critical operations systems are covered under other, more specific articles tailored to their unique requirements and characteristics. Therefore, the emphasis of Article 720 remains on defining the parameters and safety protocols for low-voltage circuits, making this the focal point of the article.