Use our Underground Cable Thermal Resistivity Rating Calculator to accurately determine the thermal resistance of soil surrounding buried electrical cables. This crucial calculation helps engineers optimize cable designs, ensure efficient heat dissipation, and prevent premature cable failure due to overheating. Understand the impact of soil thermal resistivity, burial depth, and cable diameter on performance.
Formula:
The thermal resistance of the soil (Gsoil) for a single buried cable can be approximated by:
Gsoil = (ฯsoil / (2ฯ)) * ln(4L / D)
Where:
- Gsoil = Thermal Resistance of Soil (Kยทm/W)
- ฯsoil = Thermal Resistivity of Soil (Kยทm/W)
- L = Depth of cable axis to ground surface (m)
- D = Overall diameter of the cable (m)
- ln = Natural logarithm
This value is a key input for underground cable ampacity calculations.