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Suggested Ampacities

All Types of Insulations

Based on National Electrical Code

COPPER

  • Not more than 3 conductors in raceway or cable
  • Single conductor in free air
  Conductor Temperature Rating
  85º-90º C
Temp
(185º F)
110º C
Temp
(230º F)
85º-90º C
Temp
(185º F)
110º C
Temp
(230º F)
125º C
Temp
(257º F)
200º C
Temp
(392º F)
Size AWG or MCM Amperes per conductor 100% load factor
14 25 30 30 40 40 45
12 30 35 40 50 50 55
10 40 45 55 65 70 75
8 55 60 75 85 90 100
6 70 80 100 120 125 135
4 95 105 135 160 170 180
2 125 135 185 210 225 240
1 145 160 215 245 265 280
1/0 190 215 290 330 355 370
2/0 215 245 335 385 410 430
3/0 250 275 390 445 475 510
4/0 275 315 440 495 530 -
300 310 345 485 555 590 -
350 340 390 550 610 655 -
400 365 420 595 665 710 -
500 415 470 675 765 815 -
600 460 525 750 855 910 -
700 500 560 825 940 1005 -
750 515 580 855 980 1045 -
800 535 600 885 1020 1085 -
900 565 - 950 - - -
1000 590 680 1020 1165 1240 -
Correction factors for various ambient air temperatures
40º C 0.90 0.94 0.90 0.94 0.95 -
50º C 0.80 0.87 0.80 0.87 0.89 -
60º C 0.67 0.79 0.67 0.79 0.83 0.91
70º C 0.52 0.71 0.52 0.71 0.76 0.87
80º C 0.30 0.61 0.30 0.61 0.69 0.84
90º C - 0.50 - 0.50 0.61 0.81
100º C - - - - 0.51 0.77
120º C - - - - - 0.69
140º C - - - - - 0.59

Based on ambient temperature of 30º C (86º F)

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