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.
Charges
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.”