2-1/2" PVC Sch 80 conduit fill
2-1/2" Rigid PVC conduit, Schedule 80 has an inside area of 4.119 sq in (2.290 in across). Three or more wires may take 40 % of it: 1.6476 sq in.
- One wire, 53 %
- 2.1831 sq in
- Two wires, 31 %
- 1.2769 sq in
- Three or more, 40 %
- 1.6476 sq in
- Nipple, 60 %
- 2.4714 sq in
- Support
- Every 6 ft, 3 ft from boxes
- Sold in
- 10 ft sticks
How many wires fit in 2-1/2" PVC Sch 80
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 | 170 | 118 | 118 |
| 12 AWG | 124 | 91 | 91 |
| 10 AWG | 78 | 68 | 68 |
| 8 AWG | 45 | 37 | 37 |
| 6 AWG | 32 | 28 | 22 |
| 4 AWG | 20 | 20 | 17 |
| 3 AWG | 17 | 17 | 14 |
| 2 AWG | 14 | 14 | 12 |
| 1 AWG | 10 | 10 | 8 |
| 1/0 AWG | 9 | 9 | 7 |
| 2/0 AWG | 7 | 7 | 6 |
| 3/0 AWG | 6 | 6 | 5 |
| 4/0 AWG | 5 | 5 | 4 |
| 250 kcmil | 4 | 4 | 3 |
| 300 kcmil | 3 | 3 | 3 |
| 350 kcmil | 3 | 3 | 2 |
| 400 kcmil | 3 | 3 | 1 |
| 500 kcmil | 1 | 1 | 1 |
| 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 |
|---|---|---|---|---|---|---|
| Rigid PVC conduit, Schedule 80 | 4.119 | 170 | 124 | 78 | 45 | 32 |
| Electrical metallic tubing | 5.858 | 241 | 176 | 111 | 64 | 46 |
| Intermediate metal conduit | 5.135 | 211 | 154 | 97 | 56 | 40 |
| Rigid metal conduit (RMC, GRC) | 4.866 | 200 | 146 | 92 | 53 | 38 |
| Rigid PVC conduit, Schedule 40 | 4.695 | 193 | 141 | 89 | 51 | 37 |
| 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 PVC Sch 80
Schedule 80 has a thicker wall for where it can be hit, so it holds fewer wires than Schedule 40 of the same trade size. Support is the same as Schedule 40 (Table 352.30). See strap spacing and the fill rules.