How many #10 THHN fit in 3/8" Flex?
110 AWG THHN/THWN-2 wires in 3/8" Flexible metal conduit (FMC, Greenfield)
0.116 sq in × 53 % = 0.0615 sq in allowed. ÷ 0.0211 sq in per wire = 2.91.
This pull in numbers
- 1 wires fill
- 18.2 % of 3/8" Flex
- Limit for one
- 53 %
- For 2 or more
- 1/2" Flex, up to 6
- Pipe to wire diameter
- 2.34 to 1
- In THW insulation
- 1 fit
- In XHHW-2 insulation
- 1 fit
Before you pull 1
- The ground counts. Every wire in the pipe counts toward fill, the green or bare ground and the neutrals too. 1 is the total, not the hots.
- Bends. A full pipe pulls hard. Keep to 360° of bends between pull points, less for a tight fill.
#10 THHN in other 3/8" conduit
| Conduit | Inside area | Most #10 THHN |
|---|---|---|
| Flexible metal conduit (FMC, Greenfield) | 0.116 | 1 |
| Liquidtight flexible metal conduit (LFMC) | 0.192 | 3 |