How many #8 THHN fit in 2" IMC?
398 AWG THHN/THWN-2 wires in 2" Intermediate metal conduit
3.630 sq in × 40 % = 1.4520 sq in allowed. ÷ 0.0366 sq in per wire = 39.67, so 39.
This pull in numbers
- 39 wires fill
- 39.3 % of 2" IMC
- Limit for three or more
- 40 %
- For 40 or more
- 2-1/2" IMC, up to 56
- Pipe to wire diameter
- 9.95 to 1
- In THW insulation
- 33 fit
- In XHHW-2 insulation
- 33 fit
Before you pull 39
- The ground counts. Every wire in the pipe counts toward fill, the green or bare ground and the neutrals too. 39 is the total, not the hots.
- Derating. If all 39 were current-carrying, each would be adjusted to 40 % of its ampacity (Table 310.15(C)(1)): a #8 THHN at 55 A in the 90 °C column becomes 22 A. Grounds don't count as current-carrying. How derating works
- Bends. A full pipe pulls hard. Keep to 360° of bends between pull points, less for a tight fill.
#8 THHN in other 2" conduit
| Conduit | Inside area | Most #8 THHN |
|---|---|---|
| Electrical metallic tubing | 3.356 | 36 |
| Intermediate metal conduit | 3.630 | 39 |
| Rigid metal conduit (RMC, GRC) | 3.408 | 37 |
| Rigid PVC conduit, Schedule 40 | 3.291 | 36 |
| Rigid PVC conduit, Schedule 80 | 2.874 | 31 |
| Flexible metal conduit (FMC, Greenfield) | 3.269 | 35 |
| Liquidtight flexible metal conduit (LFMC) | 3.246 | 35 |
| Electrical nonmetallic tubing (smurf tube) | 3.291 | 36 |
#8 THHN in other IMC sizes
Other wire sizes in 2" IMC
#14: 149#12: 109#10: 69#8: 39#6: 28#4: 17#3: 15#2: 12#1: 9#1/0: 8#2/0: 6#3/0: 5#4/0: 4250 kcmil: 3300 kcmil: 3350 kcmil: 2500 kcmil: 1