Low Voltage Cables/ Current Ratings And Voltage Drop List/Rating Factors for variation in Thermal Resistivity of Soil for Twin or Multi-core Cables Laid in Single Way Ducts


Rating Factors for variation in Thermal Resistivity of Soil for Twin or Multi-core Cables Laid in Single Way Ducts

Rating factors for variation in Thermal Resistivity of Soil for Twin or Multi-core Cables Laid in Single Way Ducts:

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
1.5/2.5 1.04 1.03 1.02 1.02 1.0 0.98 0.94 0.91 0.88 0.86 0.83
4 1.04 1.04 1.03 1.02 1.0 0.97 0.94 0.90 0.87 0.85 0.82
6 1.05 1.04 1.03 1.02 1.0 0.97 0.93 0.90 0.86 0.84 0.81
10 1.05 1.04 1.03 1.02 1.0 0.97 0.93 0.89 0.86 0.83 0.80
16 1.06 1.04 1.03 1.02 1.0 0.97 0.92 0.88 0.85 0.82 0.79
25 1.06 1.05 1.03 1.02 1.0 0.96 0.92 0.88 0.84 0.82 0.78
35 1.06 1.05 1.03 1.02 1.0 0.96 0.92 0.87 0.83 0.81 0.77
50 1.07 1.05 1.03 1.02 1.0 0.96 0.91 0.87 0.83 0.80 0.77
70 1.07 1.05 1.04 1.02 1.0 0.96 0.91 0.86 0.82 0.79 0.76
95 1.07 1.05 1.04 1.02 1.0 0.96 0.91 0.86 0.82 0.79 0.76
120 1.08 1.06 1.04 1.03 1.0 0.95 0.90 0.85 0.81 0.78 0.74
150 1.09 1.06 1.04 1.03 1.0 0.95 0.90 0.85 0.80 0.77 0.73
185 1.09 1.07 1.05 1.03 1.0 0.95 0.89 0.84 0.80 0.76 0.72
240 1.09 1.07 1.05 1.03 1.0 0.95 0.88 0.83 0.79 0.75 0.71
300 1.10 1.07 1.05 1.03 1.0 0.95 0.88 0.83 0.78 0.75 0.71
400 1.10 1.07 1.05 1.03 1.0 0.95 0.88 0.83 0.78 0.75 0.71