Tables > Conduit and Tubing > Conductors > Max conductors in electrical metallic tubing

	Type Letters Cond. Size AWG/kcmil Trade Sizes In Inches .5 .75 1 1.25 1.50 2 2.50 3 3.50 4 RH 14 6 10 16 28 39 64 112 169 221 282   12 4 8 13 23 31 51 90 136 177 227 RHH, RHW, RHW-2 14 4 7 11 20 27 46 80 120 157 201   12 3 6 9 17 23 38 66 100 131 167 RH, RHH, RHW, RHW-2 10 2 5 8 13 18 30 53 81 105 135   8 1 2 4 7 9 16 28 42 55 70   6 1 1 3 5 8 13 22 34 44 56   4 1 1 2 4 6 10 17 26 34 44   3 1 1 1 4 5 9 15 23 30 38   2 1 1 1 3 4 7 13 20 26 33   1 0 1 1 1 3 5 9 13 17 22   1/0 0 1 1 1 2 4 7 11 15 19   2/0 0 1 1 1 2 4 6 10 13 17   3/0 0 0 1 1 1 3 5 8 11 14   4/0 0 0 1 1 1 3 5 7 9 12   250 0 0 0 1 1 1 3 5 7 9   300 0 0 0 1 1 1 3 5 6 8   350 0 0 0 1 1 1 3 4 6 7   400 0 0 0 1 1 1 2 4 5 7   500 0 0 0 0 1 1 2 3 4 6   600 0 0 0 0 1 1 1 3 4 5   700 0 0 0 0 0 1 1 2 3 4   750 0 0 0 0 0 1 1 2 3 4 TW 14 8 15 25 43 58 96 168 254 332 424   12 6 11 19 33 45 74 129 195 255 326   10 5 8 14 24 33 55 96 145 190 243   8 2 5 8 13 18 30 53 81 105 135 RHH*, RHW*, RHW-2*, THHW, THW, THW-2 14 6 10 16 28 39 64 112 169 221 282 RHH*, RHW*, RHW-2*, THHW, THW 12 4 8 13 23 31 51 90 136 177 227   10 3 6 10 18 24 40 70 106 138 177 RHH*, RHW*, RHW-2*, THHW, THW, THW-2 8 1 4 6 10 14 24 42 63 83 106 RHH*, RHW*, RHW-2*, TW, THW, THHW, THW-2 6 1 3 4 8 11 18 32 48 63 81   4 1 1 3 6 8 13 24 36 47 60   3 1 1 3 5 7 12 20 31 40 52   2 1 1 2 4 6 10 17 26 34 44   1 1 1 1 3 4 7 12 18 24 31   1/0 0 1 1 2 3 6 10 16 20 26   2/0 0 1 1 1 3 5 9 13 17 22   3/0 0 1 1 1 2 4 7 11 15 19   4/0 0 0 1 1 1 3 6 9 12 16   250 0 0 1 1 1 3 5 7 10 13   300 0 0 1 1 1 2 4 6 8 11   350 0 0 0 1 1 1 4 6 7 10   400 0 0 0 1 1 1 3 5 7 9   500 0 0 0 1 1 1 3 4 6 7   600 0 0 0 1 1 1 2 3 4 6   700 0 0 0 0 1 1 1 3 4 5   750 0 0 0 0 1 1 1 3 4 5 THHN, THWN, THWN-2 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 FEP, FEPB, PFA, PFAH, TFE 14 12 21 34 60 81 134 234 354 462 590   12 9 15 25 43 59 98 171 258 337 430   10 6 11 18 31 42 70 122 185 241 309   8 3 6 10 18 24 40 70 106 138 177   6 2 4 7 12 17 28 50 75 98 126   4 1 3 5 9 12 20 35 53 69 88   3 1 2 4 7 10 16 29 44 57 73   2 1 1 3 6 8 13 24 36 47 60 PFA, PFAH, TFE 1 1 1 2 4 6 9 16 25 33 42 PFA, PFAH, TFE, Z 1/0 1 1 1 3 5 8 14 21 27 35   2/0 0 1 1 3 4 6 11 17 22 29   3/0 0 1 1 2 3 5 9 14 18 24   4/0 0 1 1 1 2 4 8 11 15 19 Z 14 14 25 41 72 98 161 282 426 556 711   12 10 18 29 51 69 114 200 302 394 504   10 6 11 18 31 42 70 122 185 241 309   8 4 7 11 20 27 44 77 117 153 195   6 3 5 8 14 19 31 54 82 107 137   4 1 3 5 9 13 21 37 56 74 94   3 1 2 4 7 9 15 27 41 54 69   2 1 1 3 6 8 13 22 34 45 57   1 1 1 2 4 6 10 18 28 36 46 XHH, XHHW, XHHW-2, ZW 14 8 15 25 43 58 96 168 254 332 424   12 6 11 19 33 45 74 129 195 255 326   10 5 8 14 24 33 55 96 145 190 243   8 2 5 8 13 18 30 53 81 105 135   6 1 3 6 10 14 22 39 60 78 100   4 1 2 4 7 10 16 28 43 56 72   3 1 1 3 6 8 14 24 36 48 61   2 1 1 3 5 7 11 20 31 40 51 XHH, XHHW, XHHW-2 1 1 1 1 4 5 8 15 23 30 38   1/0 1 1 1 3 4 7 13 19 25 32   2/0 0 1 1 2 3 6 10 16 21 27   3/0 0 1 1 1 3 5 9 13 17 22   4/0 0 1 1 1 2 4 7 11 14 18   250 0 0 1 1 1 3 6 9 12 15   300 0 0 1 1 1 3 5 8 10 13   350 0 0 1 1 1 2 4 7 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 6   700 0 0 0 0 1 1 2 3 4 6   750 0 0 0 0 1 1 1 3 4 5
Reprinted with permission from NFPA 70-1999, the National Electrical Code®, Copyright 1998, National Fire Protection Association, Quincy, MA 02269. This reprinted material is not the referenced subject which is represented only by the Standard in its entirety.
See also Guides Conductor sizing and ampacities for insulated conductors rated 0-2000 Volts in raceway, cable, or direct buried Parallel Conductor sizing and ampacities for insulated conductors rated 0-2000 Volts in raceway, cable, or direct buried Tables Maximum number of conductors in non-metallic tubing Dimensions and percent area of conduit and tubing Definitions Insulator Electrical Network