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Low Voltage Cables/ Current Ratings And Voltage Drop List/Rating Factors for variation in Thermal Resistivity of Soil for Two or Three Single-core Cables laid Direct in the Ground

Rating Factors for variation in Thermal Resistivity of Soil for Two or Three Single-core Cables laid Direct in the Ground

Rating Factors for variation in Thermal Resistivity of Soil for Two or Three Single-core Cables laid Direct in the Ground

Nominal Area of Conductor mm²

 Thermal Resistivity of Soil in K.m/W
   0.7  0.8  0.9 1.0 1.2  1.5  2.0  2.5  3.0 3.5 4.0
50  1.21  1.16  1.11  1.07  1.0  0.91  0.81  0.73  0.68 0.63 0.59
70 1.22  1.16  1.12  1.07  1.0  0.91  0.81  0.73  0.68 0.63 0.59
95  1.22  1.16  1.12  1.07  1.0  0.91  0.81  0.73  0.68 0.63 0.59
120  1.22  1.16  1.12  1.07  1.0  0.91  0.81  0.73  0.68 0.63 0.59
150  1.22  1.16  1.12  1.07  1.0  0.91  0.81  0.73  0.68 0.63 0.59
185  1.22  1.17  1.12  1.07  1.0  0.91  0.81  0.73  0.68 0.62 0.59
240  1.23  1.17  1.12  1.07  1.0  0.91  0.80  0.73  0.68 0.62 0.59
300  1.23  1.17  1.12  1.07  1.0  0.91  0.80  0.73  0.68 0.62 0.59
400  1.23  1.17  1.12  1.07  1.0  0.91  0.80  0.73  0.67 0.62 0.58
500  1.23  1.17  1.12  1.07  1.0  0.91  0.80  0.73  0.67 0.62 0.58
630  1.23  1.17  1.12  1.07  1.0  0.91  0.80  0.73  0.67 0.61 0.58
800  1.23  1.17  1.12  1.07  1.0  0.91  0.80  0.72  0.66 0.61 0.58
1000  1.25  1.18  1.12  1.07  1.0  0.91  0.80  0.72  0.66 0.61 0.58


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