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.
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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. (1 page, 107 KB) Click on the image above to watch the video Do you know how a surge protective device (SPD) works? Inside of an SPD specially designed components reduce voltage spikes and protect your electrical equipment from being smoked.   To learn more about how SPDs function, read the attached text and watch this video where Mike and the team explain just how SPDs do what they do! 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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