What must buildings with PV systems that have rapid shutdown include as per regulations?

Buildings equipped with photovoltaic (PV) systems that include rapid shutdown capabilities are required to have permanent labels that clearly indicate the locations of rapid shutdown initiation devices. This requirement is in line with the safety standards outlined in the National Electrical Code (NEC), designed to ensure that first responders and maintenance personnel can quickly locate and operate the shutdown devices in emergency situations. Proper labeling helps prevent accidents and ensures that these critical safety features can be accessed easily when needed.

While the other options may contribute to safety or operational efficiency, they do not specifically address the regulatory requirement for rapid shutdown systems. Redundant circuit breakers, customer service contact information, and emergency shutoff instructions do not fulfill the explicit necessity laid out in NEC regulations for labeling the location of rapid shutdown initiation devices which is crucial for effective emergency response and safety management in PV system installations.