1" PVC Sch 80 conduit fill
1" Rigid PVC conduit, Schedule 80 has an inside area of 0.688 sq in (0.936 in across). Three or more wires may take 40 % of it: 0.2752 sq in.
- One wire, 53 %
- 0.3646 sq in
- Two wires, 31 %
- 0.2133 sq in
- Three or more, 40 %
- 0.2752 sq in
- Nipple, 60 %
- 0.4128 sq in
- Support
- Every 3 ft, 3 ft from boxes
- Sold in
- 10 ft sticks
How many wires fit in 1" 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 | 28 | 19 | 19 |
| 12 AWG | 20 | 15 | 15 |
| 10 AWG | 13 | 11 | 11 |
| 8 AWG | 7 | 6 | 6 |
| 6 AWG | 5 | 4 | 3 |
| 4 AWG | 3 | 3 | 3 |
| 3 AWG | 3 | 3 | 1 |
| 2 AWG | 1 | 1 | 1 |
| 1 AWG | 1 | 1 | 1 |
| 1/0 AWG | 1 | 1 | 1 |
| 2/0 AWG | 1 | 1 | 1 |
| 3/0 AWG | 1 | 1 | 1 |
| 4/0 AWG | 1 | 1 | 0 |
Other 1" conduit
| Conduit | Inside area | #14 | #12 | #10 | #8 | #6 |
|---|---|---|---|---|---|---|
| Rigid PVC conduit, Schedule 80 | 0.688 | 28 | 20 | 13 | 7 | 5 |
| Electrical metallic tubing | 0.864 | 35 | 26 | 16 | 9 | 7 |
| Intermediate metal conduit | 0.959 | 39 | 29 | 18 | 10 | 7 |
| Rigid metal conduit (RMC, GRC) | 0.887 | 36 | 26 | 17 | 9 | 7 |
| Rigid PVC conduit, Schedule 40 | 0.832 | 34 | 25 | 15 | 9 | 6 |
| Flexible metal conduit (FMC, Greenfield) | 0.817 | 33 | 24 | 15 | 9 | 6 |
| Liquidtight flexible metal conduit (LFMC) | 0.873 | 36 | 26 | 16 | 9 | 7 |
| Electrical nonmetallic tubing (smurf tube) | 0.832 | 34 | 25 | 15 | 9 | 6 |
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.