Which of the following is NOT covered by the scope of Article 250?

Article 250 of the National Electrical Code (NEC) primarily addresses grounding and bonding requirements to ensure safety and proper operation of electrical systems. This article outlines the guidelines for grounding conductors, grounding electrodes, and equipment grounding, which are essential for protecting people and equipment from electrical faults.

Surge protection, while related to electrical safety, specifically falls outside the fundamental scope of grounding as described in Article 250. Grounding requirements for surge protection devices or systems may be referenced in other parts of the NEC, particularly in sections dealing with surge protective devices, but they do not fall directly under the core grounding requirements specified in Article 250.

In contrast, the topics of grounding of equipment, grounding electrode systems, and ground fault circuit interrupters are all integral parts of Article 250. Equipment grounding ensures that metal parts are connected to the ground to prevent shock hazards, grounding electrode systems provide a means for connecting to the earth, and ground fault circuit interrupters are designed to protect against ground faults but rely on proper grounding to function effectively. Therefore, surge protection requirements do not pertain directly to the scope of Article 250.