Quick Hits

Episode 4: Fixture Wires, TFN/TFFN, and Special Insulations

SLIDE 1 (HOOK / COVER) ⚡ NEC Quick Hit: Conductor Dimensions (Part 4 - Fixture Wires & TFN) ⚡ 

Working with control wiring, fixture whips, or machine tool wire? Let's check out Chapter 9 Table 5 dimensions for smaller specialty types like TFN, TFFN, and SF-2! 👇

SLIDE 2 (TFN & TFFN CONTROL WIRES) TFN & TFFN Wire Dimensions:

• #18 AWG TFN/TFFN: Area: 0.0055 in² | OD: 0.084 in.

• #16 AWG TFN/TFFN: Area: 0.0072 in² | OD: 0.096 in.

• Compare to standard building wire: They are much slimmer, which is why control panels and lighting whips love them!

SLIDE 3 (SPECIALTY FIXTURE WIRES: SF & KF) High-Temp & Fixture Wire Dimensions:

• SF-2 / SFF-2 (#18): Area: 0.0115 in² | OD: 0.121 in.

• KF-2 / KFF-2 (#18): Area: 0.003 in² | OD: 0.062 in.

• TFE / PFA / FEP (#14): Area: 0.0100 in² | OD: 0.113 in.

SLIDE 4 (WRAP-UP) 💡 Apprentice Pro-Tip: 

Fixture and control wire sizes range all the way down to tiny #18 gauge. When packing multi-conductor control cables or fixture whips into a small raceway, these exact Table 5 dimensions keep your fill legal.

💬 Save this post for your next control cabinet or lighting install! 🔗 More code breakdowns & study tools at www.JoshTheSparky.com

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