What is described in Article 725?

Article 725 of the National Electrical Code (NEC) specifically addresses remote-control and signaling circuits. This article sets forth the requirements for installations involving low voltage control circuits that pertain to the operation of control equipment in various systems.

Remote-control and signaling circuits are essential in various applications, such as alarm systems, heating and cooling controls, and lighting controls, where commands or signals must be sent over distances. Article 725 ensures that these circuits are installed safely and meet specific standards to protect both the users and the equipment involved.

The requirements laid out in this article include aspects related to wire types, separation from other circuits, and the conditions under which these circuits can be installed. This is crucial for maintaining the integrity and functionality of remote-control systems, ensuring reliability in operation while minimizing interference with other electrical components.

Given this focus on remote-control and signaling circuits, it is clear why this is the correct answer, as the other options, while relevant to electrical systems, do not pertain to the specific content covered in Article 725.