What key safety feature is required for disconnecting means in PV systems as per Article 690?

The requirement for disconnecting means in photovoltaic (PV) systems, as stated in Article 690 of the National Electrical Code (NEC), emphasizes that these disconnecting devices must be operable without tools and located within sight of the system.

This is essential for safety reasons, as it ensures that anyone needing to disconnect the system can do so quickly and easily without specialized equipment, which is particularly important in emergency situations or when maintenance is required. The visibility aspect allows first responders, maintenance personnel, or anyone nearby to quickly identify and access the disconnecting means, enhancing the overall safety of the installation.

Other choices present scenarios that either do not align with the Code’s intent for safety or practicality, such as requiring the disconnecting means to be inside the house, which could lead to delays in accessing the system during emergencies. Similarly, making access conditional on having to power down the system would hinder rapid access, and merely marking the device with a warning sign does not address the need for immediate operability in a safe manner.