Quick Hits

⚡ NEC 2026 Quick Hit: LFNC-C Fill & Area Limits ⚡

Wrapping up our Liquidtight Nonmetallic series with LFNC-C (Article 356 list item 3). Different construction types mean different internal dimensions.

Here is your Chapter 9 Table breakdown from 3/8" to 2" 👇

Slide 2: Common Small Sizes (3/8" - 3/4")

Small LFNC-C Trade Sizes:

• 3/8" (Metric 12)

  • 100% Total Area: 0.185 in²

  • Over 2 Wires (40%): 0.074 in²

  • ID: 0.485 in.

• 1/2" (Metric 16)

  • 100% Total Area: 0.302 in²

  • Over 2 Wires (40%): 0.121 in²

  • ID: 0.620 in.

• 3/4" (Metric 21)

  • 100% Total Area: 0.522 in²

  • Over 2 Wires (40%): 0.209 in²

  • ID: 0.815 in.

Slide 3: Mid & Large Sizes (1" - 2")

Medium to Large LFNC-C Sizes (40% Fill Limit):

• 1" (Metric 27): 0.333 in² (100% = 0.833 in² | ID: 1.030 in.)

• 1-1/4" (Metric 35): 0.590 in² (100% = 1.474 in² | ID: 1.370 in.)

• 1-1/2" (Metric 41): 0.789 in² (100% = 1.973 in² | ID: 1.585 in.)

• 2" (Metric 53): 1.314 in² (100% = 3.285 in² | ID: 2.045 in.)

Slide 4: Field Takeaway & Wrap-Up

💡 Apprentice Pro-Tip:

Notice how LFNC-C sits slightly tighter on internal area than LFNC-A or LFNC-B across most trade sizes (for instance, 1/2" LFNC-C 40% fill is 0.121 in² compared to LFNC-B's 0.125 in²).

Always check your specific flexible conduit marking on the jacket so you look up the right table column!

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