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Omicron CPC 100 - Page 213

Omicron CPC 100
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Resistance
7 - 19
Table 1:
Typical resistance of
common soil types
Figure 12:
Measuring the
resistance of a single
ground rod
Soil Type Soil Resistivity
Moor, marsh, very moist soil 1…50 Ωm
Loess, clay 20…100 Ωm
Humus, acre 10…200 Ωm
Sandy clay 50…500 Ωm
Glass sand 200…3000 Ωm
Rock 300…5000 Ωm
Stony, grassy soil 100…300 Ωm
Granite, freestone 1500…10000 Ωm
Substation
ground
ground
rod 1
ground
rod 2
ground
rod 3
ground
rod n

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