TL;DR

Study approved wiring methods, raceway types, and installation requirements per NEC. Proper wiring method selection ensures code compliance and is extensively tested.

By Valenke Exam Prep Team·Last updated 2026-06-03

Free Conduit Fill (Chapter 9) Practice Questions

Journeyman Electrician License Exam · Electrical Theory & Trade Math

This module covers Conduit Fill (Chapter 9) as part of the Electrical Theory & Trade Math section, testing your understanding of core concepts and their practical application.

Exam	Journeyman Electrician License Exam
Pass Rate	55%
Duration	240 minutes
Module	Conduit Fill (Chapter 9)

Why Conduit Fill (Chapter 9) matters

Conduit Fill (Chapter 9) is a commonly tested topic on the Journeyman Electrician License Exam because it covers fundamental knowledge required for competent professional practice.

Sample Practice Questions (5)

1. You need to pull 3 x 6 AWG THHN (0.0507 sq. in. each) and 2 x 10 AWG THHN (0.0211 sq. in. each) in EMT. The 40% fill of 3/4" EMT is 0.213 sq. in. and 1/2" EMT is 0.122 sq. in. What is the minimum trade size?

1/2"
3/4"
1"
1-1/4"

2. Per NEC Chapter 9, Table 1, what is the maximum conduit fill percentage for three or more conductors?

3. When determining conduit fill, the cross-sectional areas of insulated conductors are found in which NEC Chapter 9 table?

Table 4
Table 5
Table 8
Table 1

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4. A conduit run contains a mix of conductors: 3 THHN 10 AWG (0.0211 sq in each) and 3 THHN 6 AWG (0.0507 sq in each). Using the 40% fill rule, what is the minimum EMT trade size? Available: 1" EMT (40% = 0.1385 sq in), 1-1/4" EMT (40% = 0.2280 sq in), 1-1/2" EMT (40% = 0.3255 sq in).

1 inch
1-1/4 inch
1-1/2 inch
2 inch

5. When conductors of different sizes are installed in the same conduit, which NEC Chapter 9 table provides the area of each individual insulated conductor?

Table 4
Table 5
Table 8
Table 1

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Frequently Asked Questions

How many Conduit Fill (Chapter 9) questions are on the Journeyman Electrician License Exam?▼

The Electrical Theory & Trade Math section, which includes Conduit Fill (Chapter 9), typically represents a significant portion of the exam. Focus on understanding core concepts rather than memorizing exact question counts, as the exam uses adaptive testing.

What is the best way to study Conduit Fill (Chapter 9)?▼

Use active recall and spaced repetition rather than passive reading. Practice with realistic exam questions, review explanations for both correct and incorrect answers, and focus on understanding the reasoning behind each concept.

What topics within Conduit Fill (Chapter 9) should I focus on most?▼

Focus on the concepts that appear in our practice questions and any areas where you consistently score below 70%. The adaptive practice mode will automatically target your weak areas for efficient study.