Article 230 focuses on which area of electrical systems?

• A. Wiring methods
• B. Branch circuits
• C. Grounding electrode systems
• D. Services: service conductors and service equipment, including service disconnects

Answer: (D)

The main concept being tested is understanding which part of the NEC defines the starting point and protection of the building’s power supply—the service portion of the electrical system. Article 230 governs the service: the service conductors that come from the utility, the service equipment that houses the main overcurrent protection, and the service disconnecting means that allow shutting off power to the entire installation. It sets the requirements for how this service portion is installed, sized, protected, and made accessible. Grounding electrode systems and the more detailed rules for wiring methods and branch circuits are covered in other articles, not in this one. So the area described by Article 230 is the service portion of the electrical system, including service conductors, service equipment, and service disconnects.