| Diametro nominal | Diametro interior | Area interior total | Area disponible para conductores (mm2) | ||
| (mm) | (mm2) | 40% (para 3 conductores o mas) | 30% (para 2 conductores) | ||
| 13 | 1/2 | 15,81 | 196 | 78 | 59 |
| 19 | 3/4 | 21,3 | 35 | 142 | 107 |
| 25 | 1 | 26,5 | 552 | 221 | 166 |
| 32 | 1 1/4 | 35,31 | 979 | 392 | 294 |
| 38 | 1 1/2 | 41,16 | 1331 | 532 | 399 |
| 51 | 2 | 52,76 | 2186 | 876 | 656 |
| 63 | 2 1/2 | 62,71 | 3088 | 1235 | 926 |
| 76 | 3 | 77,93 | 4769 | 1908 | 1431 |
| 89 | 3 1/2 | 90,12 | 6378 | 2551 | 1913 |
| 102 | 4 | 102,26 | 8213 | 3285 | 2464 |