What type of circuits is defined in Article 725?

Article 725 of the National Electrical Code (NEC) specifically covers remote control and signaling circuits. These circuits are used for controlling other electrical devices from a distance, allowing for operations such as the signaling of alarms, controlling lighting systems, or managing the functions of machinery remotely. This article establishes regulations concerning the installation of such circuits, including their permits, safety standards, and the types of wiring methods that are permissible.

Understanding this is crucial for compliance with the NEC when designing or installing systems that involve remote operation or signaling, ensuring functionality and safety within electrical installations. The other options, while pertinent to different aspects of electrical installations, do not fall under the provisions of Article 725. Critical Operations Power Systems, Instrumentation Tray Cable, and Optical Fiber Cables are addressed in separate sections of the NEC, each with its own specific guidelines and requirements, but do not relate directly to the standards set out for remote-control and signaling circuits.