How many #8 THHN fit in 2" PVC Sch 40?
368 AWG THHN/THWN-2 wires in 2" Rigid PVC conduit, Schedule 40
3.291 sq in × 40 % = 1.3164 sq in allowed. ÷ 0.0366 sq in per wire = 35.97, which Note 7 rounds up to 36 because the decimal is 0.8 or more.
This pull in numbers
- 36 wires fill
- 40.0 % of 2" PVC Sch 40
- Limit for three or more
- 40 %
- For 37 or more
- 2-1/2" PVC Sch 40, up to 51
- Pipe to wire diameter
- 9.48 to 1
- In THW insulation
- 30 fit
- In XHHW-2 insulation
- 30 fit
Before you pull 36
- The ground counts. Every wire in the pipe counts toward fill, the green or bare ground and the neutrals too. 36 is the total, not the hots.
- Derating. If all 36 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 PVC Sch 40 sizes
Other wire sizes in 2" PVC Sch 40
#14: 135#12: 99#10: 62#8: 36#6: 26#4: 16#3: 13#2: 11#1: 8#1/0: 7#2/0: 6#3/0: 5#4/0: 4250 kcmil: 3300 kcmil: 3350 kcmil: 1500 kcmil: 1