What must labels indicate in PV installations according to Section 690.54?

In photovoltaic (PV) installations, Section 690.54 of the National Electrical Code (NEC) requires that labels provide critical information related to the system's characteristics. Specifically, labels must indicate the system voltage and amperage, as well as connection details. This information is essential for the safety of both the installers and any maintenance personnel, as it helps to ensure that everyone understands the electrical characteristics of the system.

Providing details such as voltage and amperage allows for proper handling and maintenance of the PV system, reducing the risk of electrical hazards. Additionally, connection details help in identifying how the system is wired, which is important for troubleshooting and ensuring that installations adhere to safety standards.

The other options fail to capture the complete scope of what is mandated for labeling in PV installations under Section 690.54. While manufacturer's specifications, contact information, or certifications may be important in other contexts, they do not encompass the essential and specific information that labels are required to provide about the system’s operation and safety features.