Ampacity Chart
TABLE B-310-1
AMPACITIES OF TWO OR THREE INSULATED CONDUCTORS
Rated 0 through 2000 volts, with an overall covering (Multiconductor), on Raceway in Free Air Based on Ambient Air Temperature of 30°C (86°F)
| SIZE | TEMPERATURE RATING OF CONDUCTOR, SEE TABLE 310-13 | SIZE | |||||
| AWG kcmil |
60°C (140°F) |
75°C (167°F) |
90°C (194°F) |
60°C (140°F) |
75°C (167°F) |
90°C (194°F) |
AWG kcmil |
| TYPES TW, UF |
TYPES RH, RHW, THHW THW, THWN |
TYPES THHN, THHW |
TYPES TW |
TYPES RH, RHW, THHW THW, THHW |
TYPES THHN, THHW |
||
| COPPER | ALUMINUM OR COPPER-CLAD ALUMINUM | ||||||
| 8 6 4 3 2 1 1/0 2/0 3/0 4/0 250 300 350 400 500 600 700 750 800 900 1000 |
36 48 66 76 88 102 121 138 158 187 205 234 255 274 315 343 376 387 397 415 448 |
43 58 79 90 105 121 145 166 189 223 245 281 305 328 378 413 452 466 479 500 542 |
48 65 89 102 119 137 163 186 214 253 276 317 345 371 427 468 514 529 543 570 617 |
28 38 51 59 69 80 94 108 124 147 160 185 202 218 254 279 310 321 331 350 382 |
33 45 61 70 83 95 113 129 147 176 192 221 242 261 303 335 371 384 397 421 460 |
37 51 69 79 93 106 127 146 167 197 217 250 273 295 342 378 420 435 450 477 521 |
8 6 4 3 2 1 1/0 2/0 3/0 4/0 250 300 350 400 500 600 700 750 800 900 1000 |
| Ambient Temp °C |
For Ambient temperatures other than 30°C (86°F) multiple
the ampacities shown above by the appropriate factor shown below |
Ambient Temp °F |
|||||
| 21-25 26-30 31-35 36-40 41-45 46-50 51-55 56-60 61-70 71-80 |
1.08 1.00 .91 .82 .71 .58 .41 - - - |
1.05 1.00 .94 .88 .82 .75 .67 .58 .33 - |
1.04 1.00 .96 .91 .87 .82 .76 .71 .58 .41 |
1.08 1.00 .91 .82 .71 .58 .41 - - - |
1.05 1.00 .94 .88 .82 .75 .67 .58 .33 - |
1.04 1.00 .96 .91 .87 .82 .76 .71 .58 .41 |
70-77 79-86 88-95 97-104 106-113 115-122 124-131 133-140 142-158 160-176 |
