Which article discusses sensitive electronic equipment?

Article 647 of the National Electrical Code (NEC) specifically addresses the requirements and considerations for sensitive electronic equipment. This article is crucial because it defines the standards necessary to protect sensitive electronic devices from electrical disturbances, including electromagnetic interference (EMI) and radio frequency interference (RFI).

Sensitive electronic equipment can be adversely affected by surges, spikes, or other electrical anomalies, leading to performance issues or damage. Article 647 focuses on proper grounding and bonding practices to ensure that these devices operate within their required parameters, thus ensuring they function correctly without being disrupted by external electrical influences.

The other articles mentioned in the choices cover different areas of electrical installation and safety. Article 668 pertains to the installation and maintenance of conductors for special purpose circuits, Article 650 deals with the requirements for cable assemblies, and Article 626 addresses the requirements for renewable energy systems, none of which focus specifically on the protection of sensitive electronic equipment. Therefore, Article 647 is the correct choice for discussions related to sensitive electronic devices, emphasizing their specific needs for protection against electrical disturbances.