What type of tool must be used to open mating connectors in PV source circuits above certain voltage thresholds?

The use of a special keyed tool for opening mating connectors in photovoltaic (PV) source circuits above certain voltage thresholds is essential for ensuring safety and compliance with the National Electrical Code (NEC), particularly in Article 690, which pertains to solar photovoltaic systems. These special tools are designed specifically to engage with proprietary locking mechanisms found in certain types of connectors used in PV systems, helping to minimize the risk of accidental disconnection or improper handling, which can pose electrical hazards.

By requiring a specially designed tool, the connection integrity is maintained, and it prevents unauthorized tampering, which is crucial in installations where high voltages are present. This requirement reflects the need for a robust safety mechanism since typical tools, such as flathead screwdrivers or pliers, may not provide the necessary precision or safety features needed when dealing with electrical connections in such applications. General-purpose tools lack the specific design needed to handle the unique features of these connectors safely. Thus, the emphasis on using a special keyed tool assures both technician safety and compliance with established electrical standards in solar installations.