Which equipment category is described by Article 647?

Article 647 of the National Electrical Code (NEC) specifically addresses sensitive electronic equipment. This category includes various types of electronic devices that can be adversely affected by electromagnetic interference (EMI) and electrical noise. The intention of this article is to provide guidance on how to install, maintain, and protect these systems in order to minimize potential disruptions and ensure reliable operation.

Sensitive electronic equipment typically requires careful consideration regarding its power and grounding requirements, as well as how to isolate it from interference stemming from nearby electrical systems. Following the guidelines set out in Article 647 can help prevent issues like data loss, malfunctions, and other operational disturbances that sensitive devices might experience in less controlled environments.

Understanding this distinction is essential for anyone working with electrical installations, particularly those involving information technology systems, telecommunications, medical devices, and similar technologies that rely on high precision and reliability.