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Earthing Resistance
Principle of Operation
75
Earthing Resistance (Ω)
Type of
Soil
Soil Re-
sitivity
[ρ
E
]
Earthing Rod m
Depth
Earthing Strip m
Ω.m 3 6 10 5 10 20
Moist
humus
soil,
30 10 5 3 12 6 3
moor soil,
swamp
Farming
soil,loam
y and
clay soils
100 33 17 10 40 20 10
Sandy
clay soils
150 50 25 15 60 30 15
Moist
sandy
soil
300 66 33 20 80 40 20
Dry
sandy
soil
1000 330 165 100 400 200 100
Concrete
1 : 5
*
400 160 80 40
Moist
gravel
500 160 80 48 200 100 50
Dry
gravel
1000 330 165 100 400 200 100
Stoney
soil
30000 1000 500 300 1200 600 300
Rock 10
7
- - - - - -
* for concrete mixtures 1 : 7 the values have to be increased by 24 %