2-inch Rigid Metal (RMC) Conduit Fill
Wire capacity of trade size 2 (metric designator 53) Rigid Metal Conduit (RMC), for THHN, XHHW, THW and RHW conductors from 14 AWG to 1000 kcmil.
2-inch Rigid Metal Conduit holds 64 × #10, 37 × #8, 27 × #6 or 16 × #4 THHN conductors at 40% fill. Internal area: 3.408 in²; usable at 40%: 1.363 in².
| Wire size | THHN | XHHW | THW | RHW | THHN in a nipple (60%) | THHN area (in²) |
|---|---|---|---|---|---|---|
| 14 AWG | 140 | 98 | 98 | 46 | 211 | 0.0097 |
| 12 AWG | 102 | 75 | 75 | 38 | 153 | 0.0133 |
| 10 AWG | 64 | 56 | 56 | 31 | 97 | 0.0211 |
| 8 AWG | 37 | 31 | 31 | 16 | 56 | 0.0366 |
| 6 AWG | 27 | 23 | 18 | 13 | 40 | 0.0507 |
| 4 AWG | 16 | 16 | 14 | 10 | 25 | 0.0824 |
| 3 AWG | 14 | 14 | 12 | 9 | 21 | 0.0973 |
| 2 AWG | 11 | 12 | 10 | 7 | 17 | 0.1158 |
| 1 AWG | 8 | 9 | 7 | 5 | 13 | 0.1562 |
| 1/0 AWG | 7 | 7 | 6 | 4 | 11 | 0.1855 |
| 2/0 AWG | 6 | 6 | 5 | 4 | 9 | 0.2223 |
| 3/0 AWG | 5 | 5 | 4 | 3 | 7 | 0.2679 |
| 4/0 AWG | 4 | 4 | 3 | 3 | 6 | 0.3237 |
| 250 kcmil | 3 | 3 | 3 | 1 | 5 | 0.3970 |
| 300 kcmil | 3 | 3 | 2 | 1 | 4 | 0.4608 |
| 350 kcmil | 2 | 2 | 1 | 1 | 4 | 0.5242 |
| 400 kcmil | 1 | 1 | 1 | 1 | 3 | 0.5863 |
| 500 kcmil | 1 | 1 | 1 | 1 | 3 | 0.7073 |
| 600 kcmil | 1 | 1 | 1 | 1 | 2 | 0.8676 |
| 700 kcmil | 1 | 1 | 1 | 1 | 2 | 0.9887 |
| 750 kcmil | 1 | 1 | 1 | 1 | 2 | 1.0496 |
| 800 kcmil | 1 | 1 | 1 | 1 | 2 | 1.1085 |
| 900 kcmil | 1 | 1 | 1 | 1 | 1 | 1.2311 |
| 1000 kcmil | 1 | 1 | 1 | 1 | 1 | 1.3478 |
Mixed wire sizes? Calculate it
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2-inch conduit: Rigid Metal Conduit vs other types
Trade size is nominal. The real inside diameter, and so the wire count, changes with the wall thickness of each raceway type.
| Conduit type | ID (in) | Area (in²) | 40% (in²) | #12 THHN | #10 THHN | #6 THHN |
|---|---|---|---|---|---|---|
| EMT | 2.067 | 3.356 | 1.342 | 101 | 63 | 26 |
| PVC Schedule 40 | 2.047 | 3.291 | 1.316 | 99 | 62 | 26 |
| PVC Schedule 80 | 1.913 | 2.874 | 1.150 | 86 | 54 | 22 |
| Rigid Metal Conduit | 2.083 | 3.408 | 1.363 | 102 | 64 | 27 |
| IMC | 2.150 | 3.630 | 1.452 | 109 | 69 | 28 |
| Flexible Metal Conduit | 2.040 | 3.269 | 1.308 | 98 | 62 | 25 |
| Liquidtight Flexible Metal Conduit | 2.033 | 3.246 | 1.298 | 97 | 61 | 25 |
| ENT | 2.047 | 3.291 | 1.316 | 99 | 62 | 26 |
Other Rigid Metal Conduit sizes
Frequently asked questions
How many #12 wires fit in 2-inch Rigid Metal Conduit?
102 conductors of 12 AWG THHN/THWN-2 at the 40% fill limit. With thicker THW or XHHW insulation the count is 75.
What is the inside diameter and area of 2-inch Rigid Metal Conduit?
The internal diameter is 2.083 in. (52.9 mm) and the total cross-sectional area is 3.408 in². The usable area is 1.363 in² at 40% fill, 1.056 in² for two wires and 1.806 in² for one.
What is the largest wire I can pull three of in 2-inch Rigid Metal Conduit?
300 kcmil THHN: 3 conductors fit at 40% fill. That is three current-carrying conductors with no ground; add the ground’s area and check again with the calculator if you need one.
Can I really load it with that many conductors?
For space, yes. But 102 current-carrying conductors in one raceway means heavy ampacity derating — 10 to 20 conductors are adjusted to 50% of their table ampacity. Fill tells you what fits; derating tells you what it can carry.
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