Conduit Fill Table

This conduit fill table is used to determine how many wires can be safely put in conduit tubing.The rows going across is the size of the conduit and the type. The columns going down shows the gauge of wire that is being used. The results are the numbers of wires of that gauge, that can be run through that size, of that kind of conduit such as EMT, IMC, and galvanized pipe. This chart is based on the 2017 NEC code.

Trade Size in Inches

Wire Size (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 1/2 in EMT 12 9 5 3 2 1 1 1 1 1
1/2 in IMC 14 10 6 3 2 1 1 1 1 1 1
1/2 in GALV 13 9 6 3 2 1 1 1 1 1

3/4		 3/4 in EMT 22 16 10 6 4 2 1 1 1 1 1 1 1
3/4 in IMC 24 17 11 6 4 3 2 1 1 1 1 1 1
3/4 in GALV 22 16 10 6 4 2 1 1 1 1 1 1 1
1 1 in EMT 35 26 16 9 7 4 3 3 1 1 1 1 1 1 1 1
1 in IMC 39 29 18 10 7 4 4 3 2 1 1 1 1 1 1 1 1
1 in GALV 36 26 17 9 7 4 3 3 1 1 1 1 1 1 1 1 1
1 1/4 1  1/4 in EMT 61 45 28 16 12 7 6 5 4 3 2 1 1 1 1 1 1 1 1 1
1 1/4 in IMC 68 49 31 18 13 8 6 5 4 3 3 2 1 1 1 1 1 1 1 1 1
1 1/4 in GALV 63 46 29 16 12 7 6 5 4 3 2 1 1 1 1 1 1 1 1 1
1 1/2 1 1/2 in EMT 84 61 38 22 16 10 8 7 5 4 3 3 2 1 1 1 1 1 1 1 1
1 1/2 in IMC 91 67 42 24 17 11 9 7 5 4 4 3 2 1 1 1 1 1 1 1 1
1 1/2 in GALV 85 62 39 22 16 10 8 7 5 4 3 3 2 1 1 1 1 1 1 1 1

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

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

Above information referenced from tables C1, C4, and C8 in the National Electric Code of 2008.
For more information on the following types of conduit, please see the table listed below in the appendix C of the National Electric Code of 2008.

Rigid PVC Conduit, Schedule 80 -- Table C9
Rigid PVC Conduit, Schedule 40 -- Table C10
Flexible Metallic Conduit -- Table C3
Liquidtight Flexible Metallic Conduit -- Table C7
Liquidtight Flexible Nonmetallic Conduit (Type FNMC-B)-- Table C5

If you have any other questions see the NEC Code Book or ask an Elliott Electric Salesperson.