AS/NZS 3008.1.2:2017
Table 29
Rating factors for thermal resistivity of the soil
The cable size and correction factors tools read the factor for the thermal resistivity of the soil. It applies only to buried cables.
Verified: read against the printed standard, pages 90. Checked 24 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 |