Which statement about grounding electrodes is true?

Which statement about grounding electrodes is true?

• A. Only one electrode is sufficient
• B. Grounding electrodes include rods, rings, and plates
• C. Electrodes must be insulated
• D. Grounding systems do not require connection to earth

Answer: (B)

Grounding electrodes are the metal pieces that create a connection from the electrical system to the earth, giving a reference point for voltage and a path for fault current to dissipate. They are placed in direct contact with the soil and bonded to the building’s grounding conductor. Grounding electrodes come in several forms, with rods driven into the ground, a ground ring around the structure, and grounding plates buried in the earth being common options. Different sites and soil conditions require these various shapes to achieve a reliable, low-impedance path to earth, which is why the statement that grounding electrodes include rods, rings, and plates is true. Other choices don’t fit because a single electrode is not universally sufficient to achieve an adequate earth return, electrodes are not meant to be insulated where they contact the earth, and grounding systems must be connected to earth to function properly.

Grounding electrodes are the metal pieces that create a connection from the electrical system to the earth, giving a reference point for voltage and a path for fault current to dissipate. They are placed in direct contact with the soil and bonded to the building’s grounding conductor. Grounding electrodes come in several forms, with rods driven into the ground, a ground ring around the structure, and grounding plates buried in the earth being common options. Different sites and soil conditions require these various shapes to achieve a reliable, low-impedance path to earth, which is why the statement that grounding electrodes include rods, rings, and plates is true.

Other choices don’t fit because a single electrode is not universally sufficient to achieve an adequate earth return, electrodes are not meant to be insulated where they contact the earth, and grounding systems must be connected to earth to function properly.