Figure 1-9. Grounding rod buried on top of rock

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b. A grounding rod can also be buried on top of rock in a trench that is 2 1/2 feet deep and 8

feet long (Figures 1-9 and 1-10).

Figure 1-9. Grounding rod buried on top of rock

Figure 1-10. Cutting a trench

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EN5144

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