Grounding and Bonding Level 1 Practice Test 2025 – Complete Exam Prep

The minimum sizing of equipment grounding conductors for branch circuits and feeders is specified in Article 250.122 of the National Electrical Code (NEC). This section outlines the requirements for determining the proper size of equipment grounding conductors based on the rating of the overcurrent protection and the size of the ungrounded conductors supplying the circuit.

Article 250.122 is essential because it provides guidelines for the effective protection of equipment and personnel by ensuring that there is a reliable path to ground in case of fault conditions. The sizing is critical for ensuring that the equipment grounding conductor is adequate to handle potential fault currents without compromising safety.

The other articles listed address different aspects of electrical installations. Article 300.14 relates to raceways and conductors, Article 400.80 deals with the use of flexible cords and cables, and Article 75.30 covers grounding for communication systems, none of which pertain specifically to the sizing of equipment grounding conductors. Thus, Article 250.122 is the correct reference for this requirement.