Raceway Fill with Mixed Conductor Sizes – NEC® Chapter 9 Explained (2026...

Raceway fill questions get tricky fast when you’re dealing with different conductor sizes, insulation types, and bare grounding conductors — and that’s exactly where most electricians get tripped up on exams.

In this video, I walk you step-by-step through how to correctly calculate raceway fill when conductors are NOT all the same size, using the 2026 National Electrical Code® and the exact tables the NEC expects you to know.

You’ll learn how to properly use:

  • Chapter 9, Table 1 – Percentage fill requirements

  • Chapter 9, Table 4 – Raceway internal areas

  • Chapter 9, Table 5 – Insulated conductor areas

  • Chapter 9, Table 8 – Bare and stranded conductor areas

More importantly, you’ll learn how these tables work together, how to avoid common exam traps, and how to stay out of trouble when conductor types, insulation, and sizes don’t match.

This is not memorization — this is understanding the NEC, so you can confidently work through journeyman and master electrician exam questions, even when they’re intentionally complex.

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At Fast Trax® Electrical Exam Prep, we don’t just give you answers. We teach you:

  • How to read NEC tables correctly

  • How to interpret exam questions

  • How to eliminate wrong choices logically

  • How to apply the Code in the real world

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If you’re serious about passing your electrical exam — and truly mastering the NEC — this is the approach that works.

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