Labeling requirements per NEC Articles 690 and ___ are extensive and provide safety warnings, inverter information, and array information.

• A. 250
• B. 705
• C. 694
• D. 706

Answer: (B)

Labeling for solar installations comes from two NEC areas. Article 690 covers the PV system itself—what must be labeled on the PV array, inverter, and related equipment to warn users and identify ratings. When the PV system is interconnected with other power sources (such as the building electrical system or the utility), Article 705 adds labeling requirements that describe the interconnection, warn about the presence of power from multiple sources, and provide key system information. Together, these sections require safety warnings, inverter information, and array information to ensure clear identification and safe operation.

The other options don’t specifically address the interconnection labeling scope for PV systems. For example, general grounding and bonding rules are in other areas, while those articles deal with different topics entirely (not the labeling and interconnection details of PV systems).