引自标准GB/T3953—1983、GB/T3955—1983、JB8734.2—1998、JB1601—1993
| 标称截面mm2 | 根数 | 单线标称直线mm | 允许偏差% | 单位允许偏差范围mm |
| 0.75 | 1 | 0.97 | ±1%d | -0.0097—+0.0097 |
| 1.0 | 1 | 1.13 | ±1%d | -0.0113—+0.0113 |
| 1.5 | 1 | 1.38 | ±1%d | -0.0138—+0.0138 |
| 2.5 | 1 | 1.78 | ±1%d | -0.0178—+0.0178 |
| 4 | 1 | 2.25 | ±1%d | -0.0225—+0.0225 |
| 6 | 1 | 2.76 | ±1%d | -0.0276—+0.0276 |
| 10 | 7 | 1.35 | ±1%d | -0.0135—+0.0135 |
| 16 | 7 | 1.7 | ±1%d | -0.017—+0.017 |
| 25 | 7 | 2.14 | ±1%d | -0.0214—+0.0214 |
| 35 | 7 | 2.52 | ±1%d | -0.0252—+0.0252 |
| 50 | 19 | 1.78 | ±1%d | -0.0178—+0.0178 |
| 70 | 19 | 2.14 | ±1%d | -0.0214—+0.0214 |
| 95 | 19 | 2.52 | ±1%d | -0.0252—+0.0252 |
| 120 | 37 | 2.03 | ±1%d | -0.0203—+0.0203 |
| 150 | 37 | 2.25 | ±1%d | -0.0225—+0.0225 |
| 185 | 37 | 2.52 | ±1%d | -0.0252—+0.0252 |
| 240 | 61 | 2.25 | ±1%d | -0.0225—+0.0225 |
| 300 | 61 | 2.52 | ±1%d | -0.0252—+0.0252 |
| 400 | 61 | 2.85 | ±1%d | -0.0285—+0.0285 |
| 500 | 91 | 2.65 | ±1%d | -0.0265—+0.0265 |
| 630 | 127 | 2.52 | ±1%d | -0.0252—+0.0252 |