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Max Number of Conductors in Electrical Metallic Tubing

Type Letters THHN, THWN, THWN-2
Cond. Size AWG/kcmil Trade Sizes in Inches
0.50 0.75 1.00 1.25 1.50 2.00 2.50 3.00 3.50 4.00
14
 12 22 35 61 84 138 241 364 476 608
12
 9 16 26 45 61 101 176 266 347 443
10
 5 10 16 28 38 63 111 167 219 279
8
 3 6 9 16 22 36 64 96 126 161
6
 2 4 7 12 16 26 46 69 91 116
4
 1 2 4 7 10 16 28 43 56 71
3
 1 1 3 6 8 13 24 36 47 60
2
 1 1 3 5 7 11 20 30 40 51
1
 1 1 1 4 5 8 15 22 29 37
1/0
 1 1 1 3 4 7 12 19 25 32
2/0
 0 1 1 2 3 6 10 16 20 26
3/0
 0 1 1 1 3 5 8 13 17 22
4/0
 0 1 1 1 2 4 7 11 14 18
250
 0 0 1 1 1 3 6 9 11 15
300
 0 0 1 1 1 3 5 7 10 13
350
 0 0 1 1 1 2 4 6 9 11
400
 0 0 0 1 1 1 4 6 8 10
500
 0 0 0 1 1 1 3 5 6 8
600
 0 0 0 1 1 1 2 4 5 7
700
 0 0 0 1 1 1 2 3 4 6
750
 0 0 0 0 1 1 1 3 4 5