What does Article 705 deal with?

Article 705 of the National Electrical Code (NEC) specifically addresses interconnected electric power production sources, such as solar photovoltaic systems or wind turbines, that are connected to the electric utility grid or to a building's electrical system. This article establishes the requirements for safely integrating these power sources into existing electrical systems to ensure both safety and compatibility.

The primary focus is on the safe operation and interconnection of these systems, promoting the proper use of protective devices, disconnects, and arrangements to prevent back-feeding into the utility grid, which can pose significant risks to utility workers and the system itself. By detailing the necessary provisions for interconnections, Article 705 helps prevent electrical hazards and ensures that the integration of renewable energy sources complies with safety standards.

The other choices do not align with the focus of Article 705. Circuits operating at less than 50 volts are covered under different sections of the NEC, while fire alarm systems have their own specific requirements in a separate article. Class 1, Class 2, and Class 3 circuits are also defined in other areas of the code that deal specifically with those types of circuits.