Mike Holt's Electrical ToolBox. I created an amazing app for the electrician, inspector, instructor, contractor, and engineer. The app contains conductor sizing (including voltage drop limitations), circuit protection sizing, race sizing, equipment grounding conductor sizing for electric heating equipment (commercial and Residential), air-conditioning equipment, motors, Transformers (commercial), and dwelling-unit service calculations and sizing. As for me and my house, I will serve the Lord [Jo
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Such an exciting time - the Changes to the National Electrical Code, 2026 edition is HERE! Learning the changes to the 2026 Code is essential for every electrical professional. This new textbook and series make learning the Code easier than ever. We’re thrilled to be partnering once again with the National Fire Protection Association® (NFPA®) on the 2026 Changes textbook. Combine it with Mike Holt’s engaging dynamic videos to strengthen your Code knowledge, reduce mistakes, and work with confide
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I'm an author, businessman, educator, speaker, publisher, and National Electrical Code® expert. I've written hundreds of electrical training books and articles, founded three successful businesses, and taught thousands of electrical code seminars across the US and internationally. I've been serving the electrical industry for over 50 years, creating and publishing books, DVDs, online training, and curriculum for electrical trainers, students, organizations, and electrical professionals. The real
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It’s our birthday! 😊 51 years ago, we made it our mission to serve the electrical trade with training and support. Thanks for helping us reach this milestone! Grateful to be a part of this incredible industry for so many decades. Have our products made a difference in your career? Please share your story in the comments. 51 years and counting… we are just getting started! | Mike Holt Enterprises
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