National Electrical Code (NEC) Article 230 Practice Exam 2025 - Free NEC Practice Questions and Study Guide

The correct choice, which pertains to the requirement for indicating the section where a grounded conductor disconnect is located within a switchboard, emphasizes the importance of clear marking. The National Electrical Code (NEC) specifies that electrical equipment must be adequately marked to prevent confusion and ensure safety during maintenance and operation.

Clear marking helps electricians and inspectors easily identify the grounded conductor disconnect and understand its function, which is critical for safe operations and troubleshooting. This becomes particularly important during electrical work when workers need to understand which section of the switchboard controls the grounded conductors.

While other factors, such as color coding and voltage rating, play roles in electrical safety and identification, they do not specifically denote the section for grounded conductor disconnects. Color coding may indicate certain types of conductors or functions, but it does not replace the need for clear, unambiguous markings that pinpoint the specific disconnect section. Thus, for the purposes of the NEC and ensuring safe electrical practices, clear marking stands out as the most appropriate indicator.