Skip to main content

TL;DR

Learn branch circuit and feeder sizing requirements, overcurrent protection, and load calculations. Circuit design is a core competency for licensed electricians and heavily tested.

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

Free Feeder Sizing (Art. 215) Practice Questions

Journeyman Electrician License Exam · Branch Circuits & Feeders

This module covers Feeder Sizing (Art. 215) as part of the Branch Circuits & Feeders section, testing your understanding of core concepts and their practical application.

ExamJourneyman Electrician License Exam
Pass Rate55%
Duration240 minutes
ModuleFeeder Sizing (Art. 215)

Why Feeder Sizing (Art. 215) matters

Feeder Sizing (Art. 215) is heavily tested because undersized conductors and services cause overheating, fires, and equipment failure.

Sample Practice Questions (5)

1. Per NEC 215.2(A)(1), feeder conductors must have an ampacity not less than the noncontinuous load plus what percentage of the continuous load?

  • 100%
  • 125%
  • 150%
  • 80%

2. A feeder supplies 40A of continuous load and 30A of noncontinuous load. What is the minimum feeder ampacity required?

  • 70A
  • 80A
  • 87.5A
  • 100A

3. Per NEC 215.2(A)(1), feeder conductors must have an ampacity not less than the sum of the non-continuous load plus what percentage of the continuous load?

  • 125 percent of the continuous load
  • 100 percent of the continuous load
  • 150 percent of the continuous load
  • 80 percent of the continuous load

Want more practice like this?

Start practicing free →

4. A commercial building feeder supplies 80 amperes of continuous load and 20 amperes of non-continuous load. Per NEC 215.3, what is the minimum overcurrent protective device rating for this feeder?

  • 125 amperes (next standard size above 120A)
  • 100 amperes
  • 110 amperes
  • 150 amperes

5. Per NEC 215.2(A)(1), an exception permits feeder conductor ampacity to be based on 100% of the continuous load (without the 125% factor) under which condition?

  • When the overcurrent device is listed for 100% continuous operation
  • When the feeder is less than 25 feet long
  • When the load consists entirely of motor loads
  • When the feeder conductors are installed in conduit

Ready to practice for the Journeyman Electrician License Exam?

Adaptive practice powered by Item Response Theory targets your weak areas. Start with 3 free sessions.

Start free practice →

Frequently Asked Questions

How many Feeder Sizing (Art. 215) questions are on the Journeyman Electrician License Exam?▼
The Branch Circuits & Feeders section, which includes Feeder Sizing (Art. 215), 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 Feeder Sizing (Art. 215)?▼
Practice solving calculation problems daily rather than just reading formulas. Work through problems step-by-step, check your units, and time yourself to build speed and accuracy under exam conditions.
What topics within Feeder Sizing (Art. 215) 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.