| 导线面积mm2 | 空气敷设长期允许载流量(A) | |||
| 空气中 | 土壤中 | |||
| 铜 | 铝 | 铜 | 铝 | |
| 1.5 | 15 | 22 | ||
| 2.5 | 19 | 15 | 19 | 23 |
| 4 | 26 | 20 | 36 | 30 |
| 6 | 32 | 26 | 47 | 39 |
| 10 | 46 | 35 | 65 | 50 |
| 16 | 60 | 47 | 84 | 65 |
| 25 | 77 | 60 | 110 | 84 |
| 35 | 95 | 74 | 130 | 100 |
| 50 | 115 | 90 | 155 | 120 |
| 70 | 145 | 115 | 195 | 150 |
| 95 | 185 | 140 | 230 | 185 |
| 120 | 210 | 165 | 260 | 205 |
| 150 | 245 | 190 | 300 | 230 |
| 185 | 280 | 215 | 335 | 260 |
| 240 | 335 | 260 | 390 | 300 |
| 300 | 375 | 295 | 435 | 340 |
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