Does the requirement for proper marking for identification of terminals include panelboards?

The requirement for proper marking for identification of terminals indeed includes panelboards. This is essential for safety and clarity in electrical installations. Proper identification helps ensure that anyone who interacts with the electrical system, whether for maintenance, troubleshooting, or operation, can easily understand the layout and function of various components.

Marking ensures that terminals are clearly associated with their corresponding circuits, reducing the risk of errors during modifications or repairs and enhancing the overall safety of the installation. The National Electrical Code (NEC) mandates clear identification in both residential and commercial settings, emphasizing that proper signage and labels play a crucial role in preventing accidents and ensuring compliance with safety standards.

The other options may suggest limitations or exclusions that do not align with NEC requirements. For instance, restricting the requirement only to residential settings or outdoor installations fails to recognize the comprehensive safety principles that apply across all types of electrical work. Thus, the obligation to provide clear and accurate markings applies universally to all panelboards regardless of their location or intended use.