Overcurrent Protection 240.4 through 240.24 – 2023 NEC

Understand NEC 240.4-240.24 requirements for overcurrent protection, including device ratings, conductor sizes, and proper installation to prevent electrical hazards.

Last updated January 9, 2025
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About the video

This lesson covers NEC 240.4-240.24, detailing the requirements for overcurrent protection devices (OCPD). You’ll learn the importance of protecting conductors from excessive current to prevent insulation damage and electrical hazards. The lesson explains the correct sizing and installation of breakers and fuses, ensuring compliance with device ratings and conductor ampacities. It also addresses specific conditions where overcurrent protection is not required and highlights the importance of accessibility and protection from physical damage​. 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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