What is required to open mating connectors used in PV source circuits operating at over 30V dc or 15V ac?

Mating connectors in photovoltaic (PV) source circuits that operate at greater than 30V DC or 15V AC are designed to prevent accidental disconnection when handling live electrical components. Requiring a tool to open these connectors serves several important safety and compliance roles, primarily in ensuring that only qualified personnel handle them.

Using a tool emphasizes the need for a deliberate action to disengage the connectors, promoting caution and diligence among users. This requirement helps in preventing unintentional disconnections that could lead to electrical hazards, such as shock or arc flash, especially in systems operating at voltage levels that can pose significant risks.

The other options, while they might seem plausible in different contexts, do not align with the specific safety standards mandated by the National Electrical Code (NEC) for high-voltage situations. A key could simply allow for easy access, which may not promote safety in an electrical setting. A password does not apply to physical connections, and manuals are useful for instruction but do not assist in physically managing the connectors. The emphasis here is on safety through the requirement of a physical tool, ensuring that only trained individuals can operate these connections correctly and securely.