How many 350 kcmil THHN fit in 2-1/2" PVC Sch 80?
3350 kcmil THHN/THWN-2 wires in 2-1/2" Rigid PVC conduit, Schedule 80
4.119 sq in × 40 % = 1.6476 sq in allowed. ÷ 0.5242 sq in per wire = 3.14, so 3.
This pull in numbers
- 3 wires fill
- 38.2 % of 2-1/2" PVC Sch 80
- Limit for three or more
- 40 %
- For 4 or more
- 3" PVC Sch 80, up to 5
- Pipe to wire diameter
- 2.80 to 1
- In THW insulation
- 2 fit
- In XHHW-2 insulation
- 3 fit
The pipe is 2.80 times the wire's diameter, inside the 2.8 to 3.2 range where three wires can wedge side by side on a pull. If you pull exactly three, go up a size or pull with care.
Before you pull 3
- The ground counts. Every wire in the pipe counts toward fill, the green or bare ground and the neutrals too. 3 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.
350 kcmil THHN in other 2-1/2" conduit
| Conduit | Inside area | Most 350 kcmil THHN |
|---|---|---|
| Electrical metallic tubing | 5.858 | 4 |
| Intermediate metal conduit | 5.135 | 4 |
| Rigid metal conduit (RMC, GRC) | 4.866 | 3 |
| Rigid PVC conduit, Schedule 40 | 4.695 | 3 |
| Rigid PVC conduit, Schedule 80 | 4.119 | 3 |
| Flexible metal conduit (FMC, Greenfield) | 4.909 | 3 |
| Liquidtight flexible metal conduit (LFMC) | 4.881 | 3 |
350 kcmil THHN in other PVC Sch 80 sizes
Other wire sizes in 2-1/2" PVC Sch 80
#14: 170#12: 124#10: 78#8: 45#6: 32#4: 20#3: 17#2: 14#1: 10#1/0: 9#2/0: 7#3/0: 6#4/0: 5250 kcmil: 4300 kcmil: 3350 kcmil: 3500 kcmil: 1