What is the name of the system of grounding electrodes interconnected by grounding conductors buried in the earth to provide lower resistance?

• A. Ground loop
• B. Ground grid
• C. Ground bus
• D. Bonding strap

Answer: (B)

The system described is the ground grid. It’s a network of grounding electrodes—such as rods, plates, or mats—that are interconnected by grounding conductors buried in the soil to create a continuous, low-impedance path to earth. This arrangement distributes fault and lightning currents more evenly and lowers the overall grounding resistance, helping to maintain a safe, common potential across the installation.

This differs from a ground loop, which is an unintended circulating current path that can cause noise or stray currents. A ground bus is the conductor or bar inside a service panel that collects all grounding conductors, not the buried network itself. A bonding strap is a short connector used to physically bond two metal parts to maintain a common potential.