What a lot of people don't realize is that the foundation for understanding the NEC rules for electrical installations is electrical theory! Whether you're a first-year apprentice still struggling to understand the difference between a volt or ampere, or a veteran electrician trying to sharpen your troubleshooting skills, this product has something for you.

We're sharing this clip from the program to introduce you to the importance of this topic. Please feel free to share this with your friends and co-workers, and for more videos and content on this topic, check out our Electrical Theory Video Library that includes the full program and digital textbook.

The content below is extracted from Mike Holt's Understanding Electrical Theory for NEC Applications textbook.

Click here or on the page thumbnail to view or download the PDF. (3 pages, 1.6 MB) Click on the image above to watch the video Since their introduction in the 1970's, there is no question that ground-fault circuit interrupters (GFCI) have saved lives! Do you know what a Ground-fault event is and how a GFCI senses and interrupts the power when they happen? Take the time to read the attached text and watch the video where Mike and the team explain the theory behind ground-fault circuit interrupters. Click on the image to the right to watch the video and download the PDF here.

For more information on this topic, get a copy of Mike Holt's Understanding Electrical Theory video program and textbook.

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