Which of the following is permitted for impedance grounded systems with a grounding impedance device limiting ground-fault current?

In impedance grounded systems, a grounding impedance device is used to limit ground-fault current, enhancing safety and allowing for continued operation during certain ground faults. The correct choice encompasses all the practices that align with the safety and operational guidelines for these systems.

Having only qualified persons service the installation is crucial, as it ensures that individuals who understand the complexities and hazards associated with electricity are the ones making changes or repairs. This helps to minimize risks and maintain compliance with safety standards.

The installation of ground detectors is another important aspect, as these devices monitor the ground fault conditions. They provide immediate alerts when a ground fault occurs, allowing for fast response to potentially hazardous situations.

Furthermore, not serving line-to-neutral loads is often a requirement in these systems to prevent imbalanced currents, which can lead to inefficiencies or increased risk during fault conditions.

The inclusion of all these practices underlines the comprehensive approach needed to ensure safety and reliability in impedance grounded systems. Therefore, since all the mentioned practices contribute to the overall integrity of the system, it is fitting that the complete answer is acknowledged as correct.