6" Rigid conduit fill
6" Rigid metal conduit (RMC, GRC) has an inside area of 29.158 sq in (6.093 in across). Three or more wires may take 40 % of it: 11.6632 sq in.
- One wire, 53 %
- 15.4537 sq in
- Two wires, 31 %
- 9.0390 sq in
- Three or more, 40 %
- 11.6632 sq in
- Nipple, 60 %
- 17.4948 sq in
- Support
- Every 10 ft, 3 ft from boxes
- Sold in
- 10 ft sticks
How many wires fit in 6" Rigid
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 | 1202 | 839 | 839 |
| 12 AWG | 877 | 644 | 644 |
| 10 AWG | 552 | 480 | 480 |
| 8 AWG | 318 | 267 | 267 |
| 6 AWG | 230 | 197 | 160 |
| 4 AWG | 141 | 143 | 120 |
| 3 AWG | 120 | 121 | 103 |
| 2 AWG | 100 | 101 | 87 |
| 1 AWG | 74 | 76 | 61 |
| 1/0 AWG | 63 | 64 | 52 |
| 2/0 AWG | 52 | 53 | 44 |
| 3/0 AWG | 43 | 44 | 37 |
| 4/0 AWG | 36 | 36 | 31 |
| 250 kcmil | 29 | 30 | 25 |
| 300 kcmil | 25 | 25 | 22 |
| 350 kcmil | 22 | 22 | 19 |
| 400 kcmil | 20 | 20 | 17 |
| 500 kcmil | 16 | 16 | 14 |
| 600 kcmil | 13 | 13 | 12 |
| 700 kcmil | 11 | 11 | 10 |
| 750 kcmil | 11 | 11 | 10 |
| 800 kcmil | 10 | 10 | 9 |
| 900 kcmil | 9 | 9 | 8 |
| 1000 kcmil | 8 | 8 | 8 |
Other 6" conduit
| Conduit | Inside area | #14 | #12 | #10 | #8 | #6 |
|---|---|---|---|---|---|---|
| Rigid metal conduit (RMC, GRC) | 29.158 | 1202 | 877 | 552 | 318 | 230 |
| Rigid PVC conduit, Schedule 40 | 28.567 | 1178 | 859 | 541 | 312 | 225 |
| Rigid PVC conduit, Schedule 80 | 25.598 | 1055 | 770 | 485 | 279 | 202 |
About Rigid
Rigid (galvanized rigid conduit, GRC) has the thickest wall and the least room inside of the steel types. Support follows 344.30: within 3 ft of each box, then every 10 ft, or longer on straight runs with threaded couplings (Table 344.30(B)(2)). See strap spacing and the fill rules.