What must be done when installing grounding at more than one building?

When installing grounding at more than one building, it is essential to extend both the grounded circuit conductor and the equipment grounding conductor. This approach ensures that the electrical system remains grounded effectively across multiple structures, providing a proper reference point for the electrical potential and ensuring safety. By extending the grounded circuit conductor, which carries return current under normal operating conditions, and the equipment grounding conductor, which is essential for safety by preventing shock hazards, you create a reliable grounding system that minimizes the risk of electrical faults and allows for efficient operation.

Maintaining separate grounding conductors for each building prevents potential differences in ground potential, which can arise if only part of the systems are grounded or if they rely on a shared grounding method. This is crucial for protecting both equipment and personnel within each building.

In contrast, connecting only the neutral conductor or installing separate neutral wires in each building would not provide a complete or safe grounding solution. Utilizing a shared ground rod also poses risks related to differences in ground potential, which is why the best and safest practice is to extend both types of grounding conductors for comprehensive safety across all structures.