Short answer: grounding rods should be selected by soil resistivity, corrosion risk, rod diameter, rod length, coating thickness, connection method and project grounding standard.
| Copper bonded rod | Common for grounding systems that need corrosion resistance and cost control. Confirm copper layer thickness. |
|---|---|
| Solid copper rod | Used in highly corrosive soil or projects requiring full copper material. |
| Galvanized steel rod | Cost-effective for general grounding where corrosion risk is controlled. |
| Connection | Use clamps, couplers, driving heads or exothermic welding according to installation method. |
Do not select grounding rods only by diameter. Material, coating thickness and soil corrosion risk are equally important.
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