AS/NZS 3008.1.1:2025
Table 3.48
Correction factors for soil thermal resistivity
The cable size, correction factors and DC cable size tools read the soil thermal resistivity factor here for a buried route.
Verified: read against the printed standard, pages 86. Checked 27 Sept 2026.
Units: Resistivity K·m/W
These are the values AmpSize encodes. No text of the standard is reproduced. Verify against the current standard.
8 rows
| Resistivity (K·m/W) | Multicore buried direct | Single core buried direct | Multicore in enclosure | Two single core in enclosure | Three single core in enclosure | Factor |
|---|---|---|---|---|---|---|
| 0.8 | 1.09 | 1.16 | 1.03 | 1.06 | 1.08 | 1.09 |
| 0.9 | 1.07 | 1.11 | 1.02 | 1.04 | 1.06 | 1.07 |
| 1 | 1.04 | 1.07 | 1.02 | 1.03 | 1.04 | 1.04 |
| 1.2 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1.5 | 0.92 | 0.9 | 0.95 | 0.94 | 0.92 | 0.92 |
| 2 | 0.81 | 0.8 | 0.88 | 0.86 | 0.83 | 0.81 |
| 2.5 | 0.74 | 0.72 | 0.83 | 0.8 | 0.77 | 0.74 |
| 3 | 0.69 | 0.66 | 0.78 | 0.75 | 0.71 | 0.69 |