Which part of Article 250 applies specifically to grounding DC systems?

The correct choice is Part VIII, which deals specifically with grounding of direct current (DC) systems. This part of the National Electrical Code (NEC) provides guidelines and requirements tailored to the unique aspects of DC systems compared to alternating current (AC) systems.

DC grounding practices differ from AC primarily due to the characteristics of direct current, such as its unidirectional flow. Part VIII outlines how to safely ground DC systems to protect both equipment and personnel. It includes provisions for grounding conductors, grounding electrodes, and the overall safety measures necessary for DC applications.

Understanding these specifications is crucial for ensuring safety and compliance in installations involving DC systems, particularly in contexts such as renewable energy sources, battery systems, and electric vehicles, where DC is prevalent.