Short answer: ground rod models should be indexed by material, diameter, length, coating thickness, coupler type and soil corrosion environment.
| 5/8 x 8 ft | Common copper bonded ground rod size for grounding networks where standard installation depth is required. |
|---|---|
| 5/8 x 10 ft | Used when longer grounding depth is needed for lower resistance or project specification. |
| 3/4 x 10 ft | Used when higher mechanical strength or larger rod diameter is required. |
| Solid copper rod | Used in corrosive soil or project specifications requiring full copper material. |
Do not compare ground rods only by diameter and length. Material and copper coating thickness strongly affect service life.