AWG-IEC Wire Gauges

American Wire Gauge (AWG) and IEC (mm2) wire sizes are often hard to correlate. There are many references on the internet, but none that gave enough information to make a useful comparison.

AWG/
kcmil
Area Circular Mils Amperes mm2
TW/UF (60C) THHW (75C) THHN (90C)
18 1620 0.8
16 2580 1.3
14* 4110 20 (15) 20 (15) 25 (20) 2.1
12* 6530 25 (20) 25 (20) 30 (20) 3.3
10* 10,380 30 35 (30) 40 (30) 5.3
8 16,510 40 50 55 8.4
6 26,240 55 65 75 13.3
4 41,740 70 85 95 21.1
3 52,620 85 100 110 26.7
2 66,360 95 115 130 33.6
1 83,690 110 130 150 42.4
1/0 105,600 125 150 170 53.5
2/0 133,100 145 175 195 67.4
3/0 167,800 165 200 225 85.0
4/0 211,600 195 230 260 107.2
250 250,000 215 255 290 126.7
300 300,000 240 285 320 152.0
350 350,000 260 310 350 177.3
400 400,000 280 335 380 202.7
500 500,000 320 380 430 253.4
600 600,000 355 420 475 304.0
700 700,000 385 460 520 354.7
750 750,000 400 475 535 380.0
800 800,000 410 490 555 405.4
900 900,000 435 520 585 456.0
1000 1000,000 455 545 615 506.7

* Maximum overcurrent protection:
#14 = 15A, #12 = 20A, #10 = 30A

NEC 2007, Chap 9, Table 8,
via Ugly's Electrical Ref 2008, pp71, 73

IEC mm2 Circular Mils Amperes
Free Air, 70C PVC In Wall, 70C PVC
0.5 987
0.75 1481
1.5 2961 17.5 13
2.5 4935 24 17.5
4 7896 32 23
6 11,844 41 29
10 19,740 57 39
16 31,584 76 52
25 49,350 96 68
35 69,090 119 83
50 98,700 144 99
70 13,8180 184 125
95 187,530 223 150
120 236,880 259 172
150 296,100 299 196
185 365,190 341 223
240 473,760 403 261
300 592,200 464 298

Short-time Withstand Rating

Copper conductors and bolted connections withstand rating:

  • 1 Ampere for 5 seconds per:
    • 30 circular mils (bare wire)
    • 42.25 circular mils (75°C insulated wire)

NEC 250-94, 250-95

Conversions

  • kcmil = Square Inches x 1273
  • kcmil = Square Millimeters x 1.974
  • mm2 = kcmil x 0.5067

2007 Erico Cadweld Catalog, Technical Information (page B-4)



AWG wire sizes

AWG mathematical relationships of sizes explained



FilenameFilesizeLast modified
awg-iec_wires.pdf8.2 KiB2015/06/10 10:09
awg-iec_wires.png116.9 KiB2015/06/10 10:09
awg-iec_wires.xls22.5 KiB2015/06/10 10:09
reference/awg-iec-wire.txt · Last modified: 2017/11/07 23:00 by Alan Shea
 
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