LFNC Conduit Fill Chart
6 supported LFNC trade sizes, computed using the site’s transcribed area tables.
Select an insulation and compare the supported LFNC sizes below. For mixed conductor sizes, use the conduit fill calculator.
- 1/2" LFNC9 wires40% tier · Note 7 no
- 3/4" LFNC16 wires40% tier · Note 7 no
- 1" LFNC26 wires40% tier · Note 7 no
- 1-1/4" LFNC46 wires40% tier · Note 7 yes
- 1-1/2" LFNC59 wires40% tier · Note 7 no
- 2" LFNC97 wires40% tier · Note 7 no
| TRADE → WIRE ↓ | 1/2" | 3/4" | 1" | 1-1/4" | 1-1/2" | 2" |
|---|---|---|---|---|---|---|
| 14 AWG | 1340% tier · Note 7 yes | 2240% tier · Note 7 no | 3640% tier · Note 7 no | 6340% tier · Note 7 no | 8140% tier · Note 7 no | 13440% tier · Note 7 yes |
| 12 AWG | 940% tier · Note 7 no | 1640% tier · Note 7 no | 2640% tier · Note 7 no | 4640% tier · Note 7 yes | 5940% tier · Note 7 no | 9740% tier · Note 7 no |
| 10 AWG | 640% tier · Note 7 yes | 1040% tier · Note 7 no | 1640% tier · Note 7 no | 2940% tier · Note 7 yes | 3740% tier · Note 7 no | 6140% tier · Note 7 no |
| 8 AWG | 340% tier · Note 7 no | 640% tier · Note 7 yes | 940% tier · Note 7 no | 1640% tier · Note 7 no | 2140% tier · Note 7 no | 3540% tier · Note 7 no |
| 6 AWG | 231% tier · Note 7 yes | 440% tier · Note 7 no | 740% tier · Note 7 yes | 1240% tier · Note 7 no | 1540% tier · Note 7 no | 2540% tier · Note 7 no |
| 4 AWG | 153% tier · Note 7 no | 231% tier · Note 7 no | 440% tier · Note 7 no | 740% tier · Note 7 no | 940% tier · Note 7 no | 1540% tier · Note 7 no |
| 3 AWG | 153% tier · Note 7 no | 153% tier · Note 7 no | 340% tier · Note 7 no | 640% tier · Note 7 no | 840% tier · Note 7 no | 1340% tier · Note 7 no |
| 2 AWG | 153% tier · Note 7 no | 153% tier · Note 7 no | 340% tier · Note 7 no | 540% tier · Note 7 no | 740% tier · Note 7 yes | 1140% tier · Note 7 no |
| 1 AWG | 153% tier · Note 7 no | 153% tier · Note 7 no | 153% tier · Note 7 no | 440% tier · Note 7 yes | 540% tier · Note 7 no | 840% tier · Note 7 no |
| 1/0 | 153% tier · Note 7 yes | 153% tier · Note 7 no | 153% tier · Note 7 no | 340% tier · Note 7 no | 440% tier · Note 7 no | 740% tier · Note 7 yes |
| 2/0 | — | 153% tier · Note 7 no | 153% tier · Note 7 no | 231% tier · Note 7 no | 340% tier · Note 7 no | 640% tier · Note 7 yes |
| 3/0 | — | 153% tier · Note 7 no | 153% tier · Note 7 no | 153% tier · Note 7 no | 340% tier · Note 7 yes | 540% tier · Note 7 yes |
| 4/0 | — | 153% tier · Note 7 yes | 153% tier · Note 7 no | 153% tier · Note 7 no | 231% tier · Note 7 yes | 440% tier · Note 7 no |
| 250 | — | — | 153% tier · Note 7 no | 153% tier · Note 7 no | 153% tier · Note 7 no | 340% tier · Note 7 no |
| 300 | — | — | 153% tier · Note 7 no | 153% tier · Note 7 no | 153% tier · Note 7 no | 340% tier · Note 7 yes |
| 350 | — | — | 153% tier · Note 7 yes | 153% tier · Note 7 no | 153% tier · Note 7 no | 231% tier · Note 7 yes |
| 400 | — | — | — | 153% tier · Note 7 no | 153% tier · Note 7 no | 153% tier · Note 7 no |
| 500 | — | — | — | 153% tier · Note 7 no | 153% tier · Note 7 no | 153% tier · Note 7 no |
| 600 | — | — | — | 153% tier · Note 7 yes | 153% tier · Note 7 no | 153% tier · Note 7 no |
| 700 | — | — | — | 153% tier · Note 7 yes | 153% tier · Note 7 no | 153% tier · Note 7 no |
| 750 | — | — | — | — | 153% tier · Note 7 no | 153% tier · Note 7 no |
| 800 | — | — | — | — | 153% tier · Note 7 yes | 153% tier · Note 7 no |
| 900 | — | — | — | — | 153% tier · Note 7 yes | 153% tier · Note 7 no |
| 1000 | — | — | — | — | — | 153% tier · Note 7 no |
LFNC-B — Liquidtight Flexible × THHN (90°C dry) · NEC 2023 Ch.9 Tables 4 & 5 · 40% (3+), 31% (2), 53% (1); Note 7 for equal insulated conductor areas
What is Liquidtight Flexible Nonmetallic Conduit, Type B?
Liquidtight Flexible Nonmetallic Conduit, Type B is the name attached to the LFNC area selection in this site's Table 4 dataset. Its 6 supported sizes run from 1/2 through 2 inches.
The LFNC selection contains Type B only; LFNC-A, LFNC-C and LFMC have no entries here. At 2 inches, LFNC-B is 3.2460 in² and its 40% budget is 1.2984 in². FMC at that size is 3.2690 in², 0.0230 in² larger. At 1 inch the ordering is reversed: LFNC-B is 0.8730 in² versus FMC’s 0.8170 in². LFMC denotes liquidtight flexible metal conduit, not a larger nonmetallic row in this table.
NEC Article 356; Chapter 9 Table 4. These comparisons use this site's stored areas; final-edition cells remain unverified. See the Table 4 guide and source status.
NOTES & CONTEXT
Read the count and actual fill
The chart evaluates all three count tiers. A result marked Note 7 can exceed the nominal percentage because the equal-area quotient rounds up at a fractional part of 0.8 or greater. Unsupported insulation/gauge cells show a dash.
See the LFNC reference for the definition and area comparison, or data verification status.