Isolated grounding receptacles are permissible on branch circuits with how many equipment grounding conductors?

Isolated grounding receptacles are designed to provide a low-impedance path to ground for electrical equipment and are typically used in sensitive electronic environments. These receptacles facilitate the reduction of electrical noise and improve equipment performance.

In order for isolated grounding receptacles to function correctly and safely, they require a single equipment grounding conductor. This conductor ensures that there is a designated path for fault currents to return to ground, enhancing both safety and system performance. The use of one equipment grounding conductor aligns with the requirement that the isolated ground must be connected to a dedicated grounding point, which avoids complications associated with multiple or inadequate grounding paths that could introduce noise or potential hazard.

Options suggesting two, three, or four grounding conductors reflect an understanding that is not aligned with the specific needs and operational standards of isolated grounding systems. The design of isolated grounding systems necessitates only one equipment grounding conductor to fulfill its purpose effectively.