Which article of NEC is primarily concerned with grounding and bonding?

Article 250 of the National Electrical Code (NEC) is specifically dedicated to grounding and bonding of electrical systems. Grounding provides a path for electrical current to safely dissipate into the earth in case of a fault, reducing the risk of electric shock and fire. Bonding ensures that all metallic parts of electrical systems are electrically connected, preventing potential differences that could pose a hazard. The provisions outlined in Article 250 detail the requirements for installing grounding electrodes, bonding conductors, and the various methods for ensuring safety and reliability in electrical installations. This article serves a critical function in promoting both safety and effective performance in electrical systems, making it the correct answer to the question.

The other articles mentioned focus on different aspects of electrical installations; for example, Article 200 pertains to the general requirements for conductors, and Article 300 covers wiring methods and general installation requirements. Article 400 deals with flexible cords and cables, which do not address grounding and bonding specifically.