3/8" Flex conduit fill
3/8" Flexible metal conduit (FMC, Greenfield) has an inside area of 0.116 sq in (0.384 in across). Three or more wires may take 40 % of it: 0.0464 sq in.
- One wire, 53 %
- 0.0615 sq in
- Two wires, 31 %
- 0.0360 sq in
- Three or more, 40 %
- 0.0464 sq in
- Nipple, 60 %
- 0.0696 sq in
- Support
- Every 4.5 ft, 12 in from boxes
How many wires fit in 3/8" Flex
All wires the same size and type, by Annex C's method. For a mix of sizes, open the calculator.
Other 3/8" conduit
| Conduit | Inside area | #14 | #12 | #10 | #8 | #6 |
|---|---|---|---|---|---|---|
| Flexible metal conduit (FMC, Greenfield) | 0.116 | 4 | 3 | 1 | 1 | 1 |
| Liquidtight flexible metal conduit (LFMC) | 0.192 | 8 | 5 | 3 | 1 | 1 |
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.