Within how many feet must the rapid shutdown switch be labeled specifically for solar PV systems?

The requirement to label the rapid shutdown switch for solar photovoltaic (PV) systems is established in the National Electrical Code (NEC) to ensure safety for first responders and maintenance personnel. Specifically, the code dictates that the rapid shutdown switch must be accessible, which is why it has to be labeled within a specific distance from the structure it serves.

The correct answer of three feet is derived from the need to ensure clear visibility and accessibility while allowing emergency responders to quickly identify the shutdown mechanism in case of a fire or other emergency involving the solar installation. This distance helps ensure that the switch is not only within reach but also easily identifiable, allowing for timely action to mitigate potential hazards.

In practice, labeling the switch at this distance helps prevent confusion during emergency situations, aligning with the NEC’s overall goal of ensuring safety and reducing risk associated with solar installations.