Are overcurrent devices for PV system dc circuits required to be readily accessible?

In the context of the National Electrical Code (NEC) related to photovoltaic (PV) systems, overcurrent devices for DC circuits are not required to be readily accessible if they are located in certain positions. The NEC recognizes that accessibility might not always be necessary depending on the installation conditions and location.

The rationale behind this is tied to safety and practical application. Many overcurrent devices installed in remote or outdoor locations, such as within a combiner box or inverter enclosure, may not be classified as "readily accessible" due to environmental factors or the inherent design of the installation. If a device is installed in a location that is not intended for regular access, such as on rooftops or in difficult-to-reach areas, the requirement for accessibility is relaxed.

This allows installers to optimize the placement of equipment without compromising safety, as long as the overcurrent protection is effectively integrated into the system design. Other options suggesting conditions under which accessibility might be required do not align with the NEC's established guidelines, reaffirming that the general stance on accessibility does not impose strict requirements for all scenarios.