Understanding the NEC can be a difficult thing to do because of how it is written. If you’re studying for a test or simply trying to digest the content so that you have a better grasp about what codes mean, then you should check out Understanding The National Electrical Code – Volume 1 by Mike Holt. This is a visual guide to understanding the NEC, and it is laid out beautifully. Not only does it cover the first half of the NEC in depth with explanations and examples, it gives you diagrams and illustrations so you can visually see what is being talked about. This will help you really dig in to code mastery.