When isolating objectionable direct-current ground currents, what device may be utilized?

The use of an AC coupling or de-isolating device is appropriate when addressing objectionable direct-current (DC) ground currents. This is because such devices are designed to allow alternating current (AC) to pass while blocking direct current (DC). This functionality is particularly important in scenarios where DC ground currents may lead to unwanted electrical interference or safety concerns, as it helps to maintain system integrity by effectively isolating DC components from AC systems.

AC coupling devices work on the principle of impedance, which allows shifting AC signals through while preventing the flow of DC. This isolation is essential in systems where mixed current types coexist, ensuring that ground faults or other anomalies in DC sources do not affect the AC system and its performance. This capability makes them a practical choice for managing objectionable DC ground currents.