| 导体标称截面积mm2 | 导体种类 | 绝缘厚度规定值mm | 平均外径mm | 20℃时导体电阻最大值 Ω/km |
70℃时绝缘电阻 最小值MΩ·km |
||
| 下限 | 上限 | 铜芯 | 镀锡铜芯 | ||||
| 1.5 | 1 | 0.7 | 2.6 | 3.2 | 12.1 | 12.2 | 0.011 |
| 1.5 | 2 | 0.7 | 2.7 | 3.3 | 12.1 | 12.2 | 0.010 |
| 2.5 | 1 | 0.8 | 3.2 | 3.9 | 7.41 | 7.56 | 0.010 |
| 2.5 | 2 | 0.8 | 3.3 | 4.0 | 7.41 | 7.56 | 0.009 |
| 4 | 1 | 0.8 | 3.6 | 4.4 | 4.61 | 4.70 | 0.0085 |
| 4 | 2 | 0.8 | 3.8 | 4.6 | 4.61 | 4.70 | 0.0077 |
| 6 | 1 | 0.8 | 4.1 | 5.0 | 3.08 | 3.11 | 0.0070 |
| 6 | 2 | 0.8 | 4.3 | 5.2 | 3.08 | 3.11 | 0.0065 |
| 10 | 1 | 1.0 | 5.3 | 6.4 | 1.83 | 1.84 | 0.0070 |
| 10 | 2 | 1.0 | 5.6 | 6.7 | 1.83 | 1.84 | 0.0065 |
| 16 | 2 | 1.0 | 6.4 | 7.8 | 1.15 | 1.16 | 0.0050 |
| 25 | 2 | 1.2 | 8.1 | 9.7 | 0.727 | — | 0.0050 |
| 35 | 2 | 1.2 | 9.0 | 10.9 | 0.524 | — | 0.0043 |
| 50 | 2 | 1.4 | 10.6 | 12.8 | 0.387 | — | 0.0043 |
| 70 | 2 | 1.4 | 12.1 | 14.6 | 0.263 | — | 0.0035 |
| 95 | 2 | 1.6 | 14.1 | 17.1 | 0.193 | — | 0.0035 |
| 120 | 2 | 1.6 | 15.6 | 18.8 | 0.153 | — | 0.0032 |
| 150 | 2 | 1.8 | 17.3 | 20.9 | 0.124 | — | 0.0032 |
| 185 | 2 | 2.0 | 19.3 | 23.3 | 0.0991 | — | 0.0032 |
| 240 | 2 | 2.2 | 22.0 | 26.6 | 0.0754 | — | 0.0032 |
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