Separately installed pressure connectors shall be used with conductors at the _____ not exceeding the ampacity.

The correct answer focuses on how pressure connectors should be used with conductors in relation to their identified temperature, which is crucial for ensuring the safety and reliability of electrical installations.

In the context of electrical conductors, "identified temperature" refers to the specific temperature ratings that conductors can safely handle without compromising their performance or safety. This rating is critical because it ensures that the connectors and conductors are compatible and can operate effectively under expected thermal conditions. If the conductors are exposed to temperatures beyond their identified ratings, it can lead to insulation damage, increased resistance, overheating, and ultimately, failure of the electrical system.

While the rated temperature, appropriate connection, and permissible voltage are relevant terms, they do not specifically address the requirements laid out for using pressure connectors with conductors in a way that relates to the ampacity, which is fundamentally tied to the identified temperature of the conductors. Thus, understanding and adhering to the identified temperature ensures that the system operates safely within the parameters established by the NEC.