First, let me thank the sparky's who gave their input on my panel change question.FYI I finally found a GE panel and returned the murray. Back to my subject of code book, I've noticed homeowners and do it yourselfer's asking code questions. There is a book called the "Illustrated Guide to the National Electric Code" by Charles R. Miller. I sometimes use this book because the code book can be hard to use. I paid around $45.00 for it and it's easier to understand than the code book. I wouldn't walk onto a job site with it, but its a nice break from the code book.