Where must the insulated EGC connected to an isolated grounding-type receptacle terminate?

The insulated Equipment Grounding Conductor (EGC) connected to an isolated grounding-type receptacle must terminate at the grounding point of the applicable service to ensure proper grounding and bonding in an electrical installation. This requirement is crucial because it provides a direct path for fault current to safely return to the source, thereby improving the overall safety and performance of the electrical system. Terminating at the grounding point ensures that all ground connections are at the same potential, which helps to prevent ground loops and potential differences that could lead to equipment malfunction or safety hazards.

In contrast, other options would not meet the necessary safety and technical standards. For instance, terminating at a junction box may not provide a reliable ground path, and doing so at a remote grounding station could introduce unnecessary resistance in the grounding system. Similarly, connecting to the nearest neutral point can lead to unsafe conditions, as it may not be at the same potential as the grounding point of the service, potentially creating a shock hazard. Maintaining a direct and properly established connection to the service ground is essential for reliable equipment operation and ensuring the safety of individuals using the electrical system.