FIG. 01 — SIZE INDEX
Conduit Fill by Trade Size
Direct-answer page for every common trade size, every common conduit family. Each page lists maximum conductor capacity per AWG at the NEC 2023 40% fill cap, with worked examples and the exact NEC Table 4 area used.
FIG. 02
EMT — ELECTRICAL METALLIC TUBING
Article 358 · NEC Ch.9 Table 4
01 · 0.304 in²
1/2" EMT
max @ 40% = 0.122 in²
02 · 0.533 in²
3/4" EMT
max @ 40% = 0.213 in²
03 · 0.864 in²
1" EMT
max @ 40% = 0.346 in²
04 · 1.496 in²
1-1/4" EMT
max @ 40% = 0.598 in²
05 · 2.036 in²
1-1/2" EMT
max @ 40% = 0.814 in²
06 · 3.356 in²
2" EMT
max @ 40% = 1.342 in²
07 · 5.858 in²
2-1/2" EMT
max @ 40% = 2.343 in²
08 · 8.846 in²
3" EMT
max @ 40% = 3.538 in²
09 · 11.545 in²
3-1/2" EMT
max @ 40% = 4.618 in²
10 · 14.753 in²
4" EMT
max @ 40% = 5.901 in²
FIG. 03
RMC — RIGID METAL CONDUIT (GALVANIZED STEEL)
Article 344 · NEC Ch.9 Table 4
01 · 0.314 in²
1/2" RMC
max @ 40% = 0.126 in²
02 · 0.549 in²
3/4" RMC
max @ 40% = 0.220 in²
03 · 0.887 in²
1" RMC
max @ 40% = 0.355 in²
04 · 1.526 in²
1-1/4" RMC
max @ 40% = 0.610 in²
05 · 2.071 in²
1-1/2" RMC
max @ 40% = 0.828 in²
06 · 3.408 in²
2" RMC
max @ 40% = 1.363 in²
07 · 4.866 in²
2-1/2" RMC
max @ 40% = 1.946 in²
08 · 7.499 in²
3" RMC
max @ 40% = 3.000 in²
09 · 10.010 in²
3-1/2" RMC
max @ 40% = 4.004 in²
10 · 12.882 in²
4" RMC
max @ 40% = 5.153 in²
11 · 20.212 in²
5" RMC
max @ 40% = 8.085 in²
12 · 29.158 in²
6" RMC
max @ 40% = 11.663 in²
FIG. 04
PVC-40 — PVC SCHEDULE 40
Article 352 · NEC Ch.9 Table 4
01 · 0.285 in²
1/2" PVC-40
max @ 40% = 0.114 in²
02 · 0.508 in²
3/4" PVC-40
max @ 40% = 0.203 in²
03 · 0.832 in²
1" PVC-40
max @ 40% = 0.333 in²
04 · 1.453 in²
1-1/4" PVC-40
max @ 40% = 0.581 in²
05 · 1.986 in²
1-1/2" PVC-40
max @ 40% = 0.794 in²
06 · 3.291 in²
2" PVC-40
max @ 40% = 1.316 in²
07 · 4.695 in²
2-1/2" PVC-40
max @ 40% = 1.878 in²
08 · 7.268 in²
3" PVC-40
max @ 40% = 2.907 in²
09 · 9.737 in²
3-1/2" PVC-40
max @ 40% = 3.895 in²
10 · 12.554 in²
4" PVC-40
max @ 40% = 5.022 in²
11 · 19.761 in²
5" PVC-40
max @ 40% = 7.904 in²
12 · 28.567 in²
6" PVC-40
max @ 40% = 11.427 in²
FIG. 05
FMC — FLEXIBLE METAL CONDUIT
Article 348 · NEC Ch.9 Table 4
01 · 0.317 in²
1/2" FMC
max @ 40% = 0.127 in²
02 · 0.533 in²
3/4" FMC
max @ 40% = 0.213 in²
03 · 0.817 in²
1" FMC
max @ 40% = 0.327 in²
04 · 1.277 in²
1-1/4" FMC
max @ 40% = 0.511 in²
05 · 1.858 in²
1-1/2" FMC
max @ 40% = 0.743 in²
06 · 3.269 in²
2" FMC
max @ 40% = 1.308 in²
07 · 4.909 in²
2-1/2" FMC
max @ 40% = 1.964 in²
08 · 7.069 in²
3" FMC
max @ 40% = 2.828 in²
09 · 9.621 in²
3-1/2" FMC
max @ 40% = 3.848 in²
10 · 12.566 in²
4" FMC
max @ 40% = 5.026 in²