Lockable Disconnecting Means – 110.25

Learn about the necessity and requirements for lockable disconnecting means in electrical systems, focusing on safety and compliance with NEC code 110.25.

Last updated December 26, 2024
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About the video

This lesson addresses the importance of lockable disconnecting means in electrical installations, as specified in NEC code 110.25. It explains why equipment must have provisions for being locked in the open position to ensure the safety of personnel working on electrical systems. The lesson highlights real-world scenarios where the lack of such safety measures has led to serious injuries, emphasizing the need for permanent and reliable locking mechanisms to prevent accidental energizing of circuits during maintenance. 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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