What should the markings on the disconnecting means include?

The requirement for markings on disconnecting means in photovoltaic (PV) systems is outlined in NEC Article 690. Specifically, the marking indicating "PV SYSTEM DISCONNECT" or an equivalent term is crucial for safety and clarity. This designation is essential in conveying the purpose of the disconnecting means, which is to allow individuals to safely disconnect the solar energy system from the electrical supply during maintenance, emergency situations, or other operational needs.

Having clear and specific markings helps ensure that anyone interacting with the system—such as emergency responders, maintenance personnel, or electricians—can quickly identify the disconnecting means, understand its function, and act accordingly. This is vital not only for the safety of individuals but also for the protection of the equipment and the integrity of the solar energy system.

Markings like "WARNING: High Voltage," while important for indicating the potential dangers associated with the system's operation, do not specifically identify the purpose of the disconnect. Similarly, "Solar Energy Source" and "Power Supply OFF" provide useful information but lack the specificity that "PV SYSTEM DISCONNECT" conveys regarding operational procedures. Having a standardized phrase contributes to uniformity and reduces the risk of misinterpretation during critical situations.