Is it true that the grounding impedance device for an impedance grounded neutral system must be installed in series with the grounding electrode conductor?

In an impedance grounded neutral system, the grounding impedance device serves a critical function by limiting the ground fault current, which enhances the safety and stability of the electrical system. Installing the grounding impedance device in series with the grounding electrode conductor is essential because it allows for the controlled grounding response necessary during fault conditions.

This configuration maintains the proper functioning of the system by ensuring that any fault current flows through the impedance device, which can then limit the magnitude of the current that returns to ground. This effectively reduces the potential for damage to equipment and decreases the risk of electric shock to personnel.

The series installation also aligns with the design principles of impedance grounding, providing enhanced protection against transient overvoltages and ensuring system reliability. Such a setup is fundamentally integral to the operational efficacy of the impedance grounded neutral systems.