1-1/2" Flex conduit fill
1-1/2" Flexible metal conduit (FMC, Greenfield) has an inside area of 1.858 sq in (1.538 in across). Three or more wires may take 40 % of it: 0.7432 sq in.
- One wire, 53 %
- 0.9847 sq in
- Two wires, 31 %
- 0.5760 sq in
- Three or more, 40 %
- 0.7432 sq in
- Nipple, 60 %
- 1.1148 sq in
- Support
- Every 4.5 ft, 12 in from boxes
How many wires fit in 1-1/2" Flex
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 | 76 | 53 | 53 |
| 12 AWG | 56 | 41 | 41 |
| 10 AWG | 35 | 30 | 30 |
| 8 AWG | 20 | 17 | 17 |
| 6 AWG | 14 | 12 | 10 |
| 4 AWG | 9 | 9 | 7 |
| 3 AWG | 7 | 7 | 6 |
| 2 AWG | 6 | 6 | 5 |
| 1 AWG | 4 | 5 | 4 |
| 1/0 AWG | 4 | 4 | 3 |
| 2/0 AWG | 3 | 3 | 3 |
| 3/0 AWG | 2 | 3 | 1 |
| 4/0 AWG | 1 | 1 | 1 |
| 250 kcmil | 1 | 1 | 1 |
| 300 kcmil | 1 | 1 | 1 |
| 350 kcmil | 1 | 1 | 1 |
| 400 kcmil | 1 | 1 | 1 |
| 500 kcmil | 1 | 1 | 1 |
| 600 kcmil | 1 | 1 | 1 |
Other 1-1/2" conduit
| Conduit | Inside area | #14 | #12 | #10 | #8 | #6 |
|---|---|---|---|---|---|---|
| Flexible metal conduit (FMC, Greenfield) | 1.858 | 76 | 56 | 35 | 20 | 14 |
| Electrical metallic tubing | 2.036 | 84 | 61 | 38 | 22 | 16 |
| Intermediate metal conduit | 2.225 | 91 | 67 | 42 | 24 | 17 |
| Rigid metal conduit (RMC, GRC) | 2.071 | 85 | 62 | 39 | 22 | 16 |
| Rigid PVC conduit, Schedule 40 | 1.986 | 82 | 59 | 37 | 21 | 15 |
| Rigid PVC conduit, Schedule 80 | 1.711 | 70 | 51 | 32 | 18 | 13 |
| Liquidtight flexible metal conduit (LFMC) | 1.981 | 81 | 59 | 37 | 21 | 15 |
| Electrical nonmetallic tubing (smurf tube) | 1.986 | 82 | 59 | 37 | 21 | 15 |
About Flex
Flex is supported every 4-1/2 ft and within 12 in of each box (348.30). Short whips to equipment have their own exceptions. See strap spacing and the fill rules.