2-1/2" IMC conduit fill
2-1/2" Intermediate metal conduit has an inside area of 5.135 sq in (2.557 in across). Three or more wires may take 40 % of it: 2.0540 sq in.
- One wire, 53 %
- 2.7216 sq in
- Two wires, 31 %
- 1.5918 sq in
- Three or more, 40 %
- 2.0540 sq in
- Nipple, 60 %
- 3.0810 sq in
- Support
- Every 10 ft, 3 ft from boxes
- Sold in
- 10 ft sticks
How many wires fit in 2-1/2" IMC
All wires the same size and type, by Annex C's method. For a mix of sizes, open the calculator.
| Wire size | THHN/THWN-2 | XHHW-2 | THW/THW-2 |
|---|---|---|---|
| 14 AWG | 211 | 147 | 147 |
| 12 AWG | 154 | 113 | 113 |
| 10 AWG | 97 | 84 | 84 |
| 8 AWG | 56 | 47 | 47 |
| 6 AWG | 40 | 35 | 28 |
| 4 AWG | 25 | 25 | 21 |
| 3 AWG | 21 | 21 | 18 |
| 2 AWG | 17 | 18 | 15 |
| 1 AWG | 13 | 13 | 11 |
| 1/0 AWG | 11 | 11 | 9 |
| 2/0 AWG | 9 | 9 | 8 |
| 3/0 AWG | 7 | 7 | 6 |
| 4/0 AWG | 6 | 6 | 5 |
| 250 kcmil | 5 | 5 | 4 |
| 300 kcmil | 4 | 4 | 4 |
| 350 kcmil | 4 | 4 | 3 |
| 400 kcmil | 3 | 3 | 3 |
| 500 kcmil | 3 | 3 | 2 |
| 600 kcmil | 1 | 1 | 1 |
| 700 kcmil | 1 | 1 | 1 |
| 750 kcmil | 1 | 1 | 1 |
| 800 kcmil | 1 | 1 | 1 |
| 900 kcmil | 1 | 1 | 1 |
| 1000 kcmil | 1 | 1 | 1 |
Other 2-1/2" conduit
| Conduit | Inside area | #14 | #12 | #10 | #8 | #6 |
|---|---|---|---|---|---|---|
| Intermediate metal conduit | 5.135 | 211 | 154 | 97 | 56 | 40 |
| Electrical metallic tubing | 5.858 | 241 | 176 | 111 | 64 | 46 |
| Rigid metal conduit (RMC, GRC) | 4.866 | 200 | 146 | 92 | 53 | 38 |
| Rigid PVC conduit, Schedule 40 | 4.695 | 193 | 141 | 89 | 51 | 37 |
| Rigid PVC conduit, Schedule 80 | 4.119 | 170 | 124 | 78 | 45 | 32 |
| Flexible metal conduit (FMC, Greenfield) | 4.909 | 202 | 147 | 93 | 53 | 38 |
| Liquidtight flexible metal conduit (LFMC) | 4.881 | 201 | 146 | 92 | 53 | 38 |
About IMC
IMC has a thinner wall than rigid, so it has a little more room inside size for size. Support follows 342.30: within 3 ft of each box, then every 10 ft, or longer on straight runs with threaded couplings. See strap spacing and the fill rules.