National Electrical Code (NEC) Codes and Standards Practice Exam

Article 230 focuses on services: the service conductors, service equipment, and the service disconnects. This article specifically covers the parts of an electrical system that originate at the utility service point and feed the building, including how the service conductors are installed, how the service equipment is arranged, and how service disconnects are rated and located. That direct focus on the service portion distinguishes it from the other articles listed, which address different aspects of electrical installations: Article 110 covers general installation rules, Article 200 covers definitions used throughout the NEC, and Article 240 deals with overcurrent protection.