Quick Hits

EPISODE 2 — THE CONDUIT FILL WORKFLOW

SLIDE 1 — DON'T START WITH THE CONDUIT

⚡ CONDUIT FILL IS A MATH PROBLEM

Before grabbing a conduit size, identify:

1. Raceway type

2. Raceway trade size

3. Number of conductors

4. Conductor size

5. Conductor insulation/type

Then hit the NEC tables.

SLIDE 2 — YOUR 3 MAIN TABLES

📚 CHAPTER 9

TABLE 1
➡️ Determines the permitted fill %

TABLE 4
➡️ Raceway internal cross-sectional area

TABLE 5 / 5A
➡️ Conductor dimensions / areas

🔥 1 → 4 → 5

That's a workflow worth memorizing.

SLIDE 3 — THE BASIC EQUATION

Once you have the conductor areas:

TOTAL CONDUCTOR AREA

⬇️

COMPARE IT TO

PERMITTED RACEWAY AREA

Example:

Raceway allowable area:

0.213 in²

Conductors:

0.200 in²

✅ PASS

But...

0.220 in²

❌ FAIL

SLIDE 4 — EXAM CHECK

You have 3+ conductors.

Which Chapter 9 table tells you the maximum percentage of raceway area they may occupy?

A️⃣ Table 1

B️⃣ Table 4

C️⃣ Table 5

D️⃣ Annex C

🔥 ANSWER: A — TABLE 1

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