Which of the following is a requirement for PV systems regarding the controlled conductors?

The requirement for PV systems regarding controlled conductors is the limitation of voltage within a specific time frame. This is essential to ensure safety and protection of the system, as excessive voltage can lead to equipment damage, electrical hazards, or fire risks. By limiting voltage, the system can maintain safe operating conditions, ensuring that the components operate within their specified voltage ratings and preventing overvoltage conditions from impacting the overall system performance.

Limiting the voltage also plays a crucial role in how the system is designed to handle fault conditions. It can prevent excessive electrical shock hazards and ensure that protective devices operate correctly to isolate any malfunctioning sections of the system. This requirement is part of maintaining compliance with safety standards and ensures the reliability of the PV installation.

The other choices, while they address valuable aspects of PV systems, such as the presence of an inverter or daily inspections, do not directly relate to the regulation of voltage levels in its critical operational context as established in the NEC.