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Conduit Fill Chart

The conduit fill chart offers a quick and convenient suggestion to determine the number of wires in a conduit. There are several types of conduits on the chart i.e. EMT and RMC. The conduit fill chart fully complies with NEC 2017 chapter 9.

For a mix of wire type and size, an online tool to decide conduit fill (in percent) has been introduced in this site.

Conduit Fill Chart

Conduit Size (Inches)

Wire Type (THWN, THHN) – Conductor Size AWG/kcmil

14 12 10 8 6 4 3 2 1 1/0 2/0 3/0 4/0 250 300 350 400 500 600 700 750
1/2 EMT 12 9 5 3 2 1 1 1 1 1
IMC 14 10 6 3 2 1 1 1 1 1 1
RMC 13 9 6 3 2 1 1 1 1 1
3/4 EMT 22 16 10 6 4 2 1 1 1 1 1 1 1
IMC 24 17 11 6 4 3 2 1 1 1 1 1 1
RMC 22 16 10 6 4 2 1 1 1 1 1 1 1
1 EMT 35 26 16 9 7 4 3 3 1 1 1 1 1 1 1 1
IMC 39 29 18 10 7 4 4 3 2 1 1 1 1 1 1 1 1
RMC 36 26 17 9 7 4 3 3 1 1 1 1 1 1 1 1 1
1 1/4 EMT 61 45 28 16 12 7 6 5 4 3 2 1 1 1 1 1 1 1 1 1
IMC 68 49 31 18 13 8 6 5 4 3 3 2 1 1 1 1 1 1 1 1 1
RMC 63 46 29 16 12 7 6 5 4 3 2 1 1 1 1 1 1 1 1 1
1 1/2 EMT 84 61 38 22 16 10 8 7 5 4 3 3 2 1 1 1 1 1 1 1 1
IMC 91 67 42 24 17 11 9 7 5 4 4 3 2 1 1 1 1 1 1 1 1
RMC 85 62 39 22 16 10 8 7 5 4 3 3 2 1 1 1 1 1 1 1 1
2 EMT 138 101 63 36 26 16 13 11 8 7 6 5 4 3 3 2 1 1 1 1 1
IMC 149 109 69 39 28 17 15 12 9 8 6 5 4 3 3 2 2 1 1 1 1
RMC 140 102 64 37 27 16 14 11 8 7 6 5 4 3 3 2 2 1 1 1 1
2 1/2 EMT 241 176 111 64 46 28 24 20 15 12 10 8 7 6 5 4 4 3 2 2 1
IMC 211 154 97 56 40 25 21 17 13 11 9 7 6 5 4 4 3 3 2 1 1
RMC 200 146 92 53 38 23 20 17 12 10 8 7 6 5 4 3 3 2 1 1 1
3 EMT 364 266 167 96 69 43 36 30 22 19 16 13 11 9 7 6 6 5 4 3 3
IMC 326 238 150 86 62 38 32 27 20 17 14 12 9 8 7 6 5 4 3 3 3
RMC 309 225 142 82 59 36 31 26 19 16 13 11 9 7 6 5 5 4 3 3 3
3 1/2 EMT 476 347 219 126 91 56 47 40 29 25 20 17 14 11 10 9 8 6 5 4 4
IMC 436 318 200 115 83 51 43 36 27 23 19 16 13 10 9 8 7 6 5 4 4
RMC 412 301 189 109 79 48 41 34 25 21 18 15 12 10 8 7 7 5 4 4 4

4
EMT 608 443 279 161 116 71 60 51 37 32 26 22 18 15 13 11 10 8 7 6 5
IMC 562 410 258 149 107 66 56 47 35 29 24 20 17 13 12 10 9 7 6 5 5
RMC 531 387 244 140 101 62 53 44 33 27 23 19 16 13 11 10 8 7 6 5 5
 

If you required conduit fill chart of other wire type, please contact admin@electrical-engineering.net

Is the grounding wire counted in conduit fill chart?

Puling multiple wires or cables can occur jamming if the ratio of the raceway (inside diameter) to the conductor or cable (outside diameter) is not properly complied. With this respect, grounding wire must be counted for conduit fill percentage.

However, the above table is for same size wires, forget the tables when you have mixed sizes. Let make to do the math on conduit fill and compare with allowable percentage.