Table 310.71 Ampacities of an Insulated Three-Conductor Copper Cable Isolated in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)
| Conductor Size (AWG or kcmil) | Temperature Rating of Conductor | |||
| 2001 - 5000 Volts Ampacity | 5001 - 35,000 Volts Ampacity | |||
| 90°C (194°F) Type MV-90 | 105°C (221°F) Type MV-105 | 90°C (194°F) Type MV-90 | 105°C (221°F) Type MV-105 | |
| 8 | 59 | 66 | – | – |
| 6 | 79 | 88 | 93 | 105 |
| 4 | 105 | 115 | 120 | 135 |
| 2 | 140 | 154 | 165 | 185 |
| 1 | 160 | 180 | 185 | 210 |
| 1/0 | 185 | 205 | 215 | 240 |
| 2/0 | 215 | 240 | 245 | 275 |
| 3/0 | 250 | 280 | 285 | 315 |
| 4/0 | 285 | 320 | 325 | 360 |
| 250 | 320 | 355 | 360 | 400 |
| 350 | 395 | 440 | 435 | 490 |
| 500 | 485 | 545 | 535 | 600 |
| 750 | 615 | 685 | 670 | 745 |
| 1000 | 705 | 790 | 770 | 860 |
Table 310.73 Ampacities of an Insulated Triplexed or Three Single-Conductor Copper Cables in Isolated Conduit in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)
| Conductor Size (AWG or kcmil) | Temperature Rating of Conductor | |||
| 2001 - 5000 Volts Ampacity | 5001 - 35,000 Volts Ampacity | |||
| 90°C (194°F) Type MV-90 | 105°C (221°F) Type MV-105 | 90°C (194°F) Type MV-90 | 105°C (221°F) Type MV-105 | |
| 8 | 55 | 61 | – | – |
| 6 | 75 | 84 | 83 | 93 |
| 4 | 97 | 110 | 110 | 120 |
| 2 | 130 | 145 | 150 | 165 |
| 1 | 155 | 175 | 170 | 190 |
| 1/0 | 180 | 200 | 195 | 215 |
| 2/0 | 205 | 225 | 225 | 255 |
| 3/0 | 240 | 270 | 260 | 290 |
| 4/0 | 280 | 305 | 295 | 330 |
| 250 | 315 | 355 | 330 | 365 |
| 350 | 385 | 430 | 395 | 440 |
| 500 | 475 | 530 | 480 | 535 |
| 750 | 600 | 665 | 585 | 655 |
| 1000 | 690 | 770 | 675 | 755 |
Table 310.75 Ampacities of an Insulated Three-Conductor Copper Cable in Isolated Conduit in Air Based on Conductor Temperatures of 90°C (194°F) and 105°C (221°F) and Ambient Air Temperature of 40°C (104°F)
| Conductor Size (AWG or kcmil) | Temperature Rating of Conductor | |||
| 2001 - 5000 Volts Ampacity | 5001 - 35,000 Volts Ampacity | |||
| 90°C (194°F) Type MV-90 | 105°C (221°F) Type MV-105 | 90°C (194°F) Type MV-90 | 105°C (221°F) Type MV-105 | |
| 8 | 52 | 58 | – | – |
| 6 | 69 | 77 | 83 | 92 |
| 4 | 91 | 100 | 105 | 120 |
| 2 | 125 | 135 | 145 | 165 |
| 1 | 140 | 155 | 165 | 185 |
| 1/0 | 165 | 185 | 195 | 215 |
| 2/0 | 190 | 210 | 220 | 245 |
| 3/0 | 220 | 245 | 250 | 280 |
| 4/0 | 255 | 285 | 290 | 320 |
| 250 | 280 | 315 | 315 | 350 |
| 350 | 350 | 390 | 385 | 430 |
| 500 | 425 | 475 | 470 | 525 |
| 750 | 525 | 585 | 570 | 635 |
| 1000 | 590 | 660 | 650 | 725 |