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Need to see Electrical Conductors in a Quick and Easy Table? Just Select the Conduit type and the Wire Insulation to Get A Quick Table of conductor properties.

Conduit Type: Insulation Type:

Size Copper Aluminum Diameter Wires in Conduit
60°C 75°C 90°C 60°C 75°C 90°C 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 3 1/2" 4"
#14 20 A 20 A 25 A 0.11 in 12 22 35 61 84 138 242 365 477 609
#12 25 A 25 A 30 A 20 A 20 A 25 A 0.13 in 9 16 25 45 61 101 176 266 347 444
#10 30 A 35 A 40 A 25 A 30 A 35 A 0.16 in 5 10 16 28 38 63 110 167 218 279
#8 40 A 50 A 55 A 30 A 40 A 45 A 0.22 in 3 5 9 16 22 36 63 96 126 161
#6 55 A 65 A 75 A 40 A 50 A 60 A 0.25 in 1 4 6 11 16 26 46 69 91 116
#4 70 A 85 A 95 A 55 A 65 A 75 A 0.32 in 1 2 4 7 9 16 28 42 56 71
#3 85 A 100 A 110 A 65 A 75 A 85 A 0.35 in 1 1 3 6 8 13 24 36 47 60
#2 95 A 115 A 130 A 75 A 90 A 100 A 0.38 in 1 1 2 5 7 11 20 30 39 50
#1 110 A 130 A 150 A 85 A 100 A 115 A 0.45 in 1 1 1 3 5 8 14 22 29 37
#1/0 125 A 150 A 170 A 100 A 120 A 135 A 0.49 in 0 1 1 3 4 7 12 19 24 31
#2/0 145 A 175 A 195 A 115 A 135 A 150 A 0.53 in 0 1 1 2 3 6 10 15 20 26
#3/0 165 A 200 A 225 A 130 A 155 A 175 A 0.58 in 0 1 1 1 3 5 8 13 17 22
#4/0 195 A 230 A 260 A 150 A 180 A 205 A 0.64 in 0 0 1 1 1 4 7 10 14 18
#250 215 A 255 A 290 A 170 A 205 A 230 A 0.71 in 0 0 1 1 1 3 5 8 11 14
#300 240 A 285 A 320 A 190 A 230 A 255 A 0.77 in 0 0 0 1 1 2 5 7 10 12
#350 260 A 310 A 350 A 210 A 250 A 280 A 0.82 in 0 0 0 1 1 1 4 6 8 11
#400 280 A 335 A 380 A 225 A 270 A 305 A 0.86 in 0 0 0 1 1 1 3 6 7 10
#500 320 A 380 A 430 A 260 A 310 A 350 A 0.95 in 0 0 0 1 1 1 3 5 6 8
#600 355 A 420 A 475 A 285 A 340 A 385 A 1.05 in 0 0 0 0 1 1 2 4 5 6
#700 385 A 460 A 520 A 310 A 375 A 420 A 1.12 in 0 0 0 0 1 1 1 3 4 5
#750 400 A 475 A 535 A 320 A 385 A 435 A 1.16 in 0 0 0 0 1 1 1 3 4 5
#800 410 A 490 A 555 A 330 A 395 A 450 A 1.19 in 0 0 0 0 0 1 1 3 4 5
#900 435 A 520 A 585 A 355 A 425 A 480 A 1.25 in 0 0 0 0 0 1 1 2 3 4
#1000 455 A 545 A 615 A 375 A 445 A 500 A 1.31 in 0 0 0 0 0 1 1 2 3 4
No guarantees are made as to the accuracy of the calculation or compliance with local codes.  Verify all calculations with a professional engineer. If you find an error, or have a suggestion, please send us an email.