How should PV system DC circuits use an approved means to identify conductors that don’t rely on color coding?

Labeling is the correct approach for identifying conductors in photovoltaic (PV) system DC circuits when color coding is not relied upon. The National Electrical Code (NEC) emphasizes the importance of clear and consistent identification of conductors in PV systems to ensure safety, maintainability, and compliance with electrical standards. Proper labeling provides a clear indication of the function and characteristics of each conductor, making it easier for technicians and electricians to understand the system layout and avoid mistakes during maintenance or troubleshooting.

In addition to aiding in safety and compliance, labeling helps in preventing potential hazards that could arise from misidentifying conductors. Each label must clearly indicate its purpose, such as whether it carries direct current (DC) or is associated with a specific component of the solar power system.

While shrink-tubing and tagging can serve as supplementary identification means, they do not fulfill the comprehensive requirements of clear identification mandated by the NEC, which emphasizes labeling as a formal method of electrical circuit marking. Thus, labeling stands out as the primary method for conductor identification in this context.