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.