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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.
| GFCI, Special Purpose Type |
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Click here or on the page thumbnail to view or download the PDF. (1 page, 372 KB)
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Click on the image above to watch the video
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Class “A” GFCI devices have been around for so long that we’ve all become pretty familiar with them, but have you ever heard of an “SPGFCI” (special purpose ground-fault circuit interrupter)?
A GFCI device can only be used on circuits having a voltage to ground less than 150V, but a SPGFCI device can be used on circuits where the voltage to ground is greater than 150V. Another key difference between GFCI’s and SPGFCI’s is the current tripping threshold in which the circuit opens.
Learn what you need to know by reading the attached text and watching the video where Mike and the team discuss this new special purpose ground-fault protection device.Click on the image to the right to watch the video and download the PDF here.
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For more information on this topic, get a copy of Mike Holt's Understanding Electrical Theory video program and textbook.
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