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 MIL-HDBK-419A
Table 2-3 (Continued)
Resistivity Values of Earthing Medium (2-5), (2-6), (2-7)
Medium
Minimum
Average
Maximum
(ohm-cm)
(ohm-cm)
(ohm-cm)
6 x 102
2.5 x 103
7 x 103
Fills, ashes, cinders, brine, waste
3 x 102
4 x 103
2 x 104
Clay, shale, gumbo, loam
Same-with varying proportion of
103
1.5 x 104
sand and gravel
Gravel, sand stones with little clay
5 x 104
105
or loam, granite
Figure 2-4. Current Flow From a Hemisphere in Uniform Earth
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