Which device is NOT involved in the rapid shutdown initiation for a PV system?

The inclusion of a thermostat control in rapid shutdown initiation for a photovoltaic (PV) system is not necessary. Rapid shutdown procedures are designed to enhance the safety of emergency responders and individuals in close proximity to PV systems by ensuring the system can be de-energized quickly in the event of an emergency. The primary devices involved in this process typically include means for disconnecting the service transformer and PV systems, as well as an accessible switch that can provide an immediate indication of the operational status.

The service disconnecting means is essential as it serves as the main shut-off for the entire system, allowing for the safe disconnection from the utility grid. The PV system disconnecting means enables the separation of individual panels or arrays for maintenance or in emergencies. A readily accessible switch that indicates on/off position provides immediate control and visibility of the system status, fulfilling the intention of the rapid shutdown measures defined in the National Electrical Code.

Since a thermostat control does not typically serve a direct role in the rapid shutdown process, it is the correct choice for which device is not involved. This illustrates a clear understanding of the safety protocols associated with managing PV systems as outlined in NEC Article 690.