Which article covers circuits and equipment operating at lower voltages?

Article 720 of the National Electrical Code (NEC) specifically addresses the requirements for low-voltage circuits and wiring methods. This article is focused on Class 1, Class 2, and Class 3 circuits, which are defined by their voltage levels and the associated safety requirements. Class 2 and Class 3 circuits, in particular, are designed to operate at lower voltages, helping to minimize the risks of electric shock and ensuring safe operation.

The reason Article 720 is the correct answer lies in its emphasis on the safe installation of wiring methods for these lower voltage systems. These fall into categories that enhance safety and reduce the likelihood of electric shock, promoting best practices for electricians working with such circuits.

Other articles mentioned address different aspects of electrical installations. For instance, Article 725 pertains to the installation of signaling circuits, while Article 770 focuses on optical fiber cabling. Article 800 deals with communication circuits. Each of these articles has its specific scope and does not focus primarily on low-voltage applications in the same comprehensive manner as Article 720.