Motor OCPD Sizing

Understand motor overcurrent protection device (OCPD) sizing, focusing on short circuit, ground fault, and overload protection, using NEC tables and code guidelines.

Last updated December 16, 2024
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About the video

This lesson covers the NEC requirements for sizing overcurrent protection devices (OCPD) for motors. You’ll learn how to protect motors from short circuits, ground faults, and overloads by correctly sizing breakers and fuses. The lesson explains the use of various NEC tables, including those for full load current (FLC) and specific motor types. Detailed examples illustrate the calculations needed to ensure safe and compliant motor installations, highlighting the unique aspects of motor protection compared to other electrical loads. To get started, go to the Lesson Content tab and click on the video.

About the quiz

Each lesson contains a video, and is followed up with a simple quiz. Quizzes review information discussed within the video, with each question providing an answer justification. Helping to reinforce correct answers and helps clarify any mistakes through code citations, excerpts, and explanations, so you can better understand the material.

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Charges are rewards you earn for engaging in our learning system. You receive charges for completing both the video and the quiz in each lesson. The amount of charges available for each lesson is displayed in the “Lesson Features” box on the right. The charges you earn are based on the time it takes you to complete the lesson, which is also indicated in “Lesson Features.”

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Dustin Stelzer Instructor
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