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 |