A Ufer grounding electrode is formed by embedding which component in concrete?

A Ufer grounding electrode is formed by embedding which component in concrete?

• A. Copper plate.
• B. Concrete-encased steel reinforcing bars.
• C. Grounded copper wire as a mesh.
• D. Plastic-coated rebar.

Answer: (B)

Concrete-encased steel reinforcing bars create a low-impedance path to earth when embedded in moist concrete, which is the defining idea of a Ufer grounding electrode. The moisture and large surface area of the embedded rebar in the foundation provide excellent grounding reliability, especially in new buildings. That’s why this setup—steel reinforcing bars encased in concrete—is the correct description of a Ufer electrode. Other ideas, like a copper plate, a grounded copper wire mesh, or plastic-coated rebar, don’t match the Ufer concept: a copper plate is a different type of electrode, a copper mesh isn’t the typical embedded, high-area path used in Ufer grounding, and plastic coating would prevent the steel from making proper electrical contact with the concrete and soil.

Concrete-encased steel reinforcing bars create a low-impedance path to earth when embedded in moist concrete, which is the defining idea of a Ufer grounding electrode. The moisture and large surface area of the embedded rebar in the foundation provide excellent grounding reliability, especially in new buildings. That’s why this setup—steel reinforcing bars encased in concrete—is the correct description of a Ufer electrode. Other ideas, like a copper plate, a grounded copper wire mesh, or plastic-coated rebar, don’t match the Ufer concept: a copper plate is a different type of electrode, a copper mesh isn’t the typical embedded, high-area path used in Ufer grounding, and plastic coating would prevent the steel from making proper electrical contact with the concrete and soil.