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 MIL-HDBK-419A
Figure 2-8. Earth Resistance Shells Surrounding a Vertical Earth Electrode
Equation 2-20 permits the area of influence of a single rod to be determined. For example, consider a 10-foot
long, l-inch diameter rod at distance x =
= 0.15
The ratio of 0.15 indicates that 85 percent of the total resistance to earth of a 10-foot long ground rod is
established within 10 feet of the rod. For a 100-foot rod, 89 percent of the grounding resistance is obtained
within 100 feet of the rod.
2-20
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