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More and more states are requiring licenses to do low-voltage work. By using this program, listening to Mike Holt explain the rules and then answering all of the practice questions and taking the final exam you'll gain a better understanding of this subject. The textbook has excellent full color graphics and Mike explains the NEC in an easy to understand language. Even if you are not taking an exam but are interested in learning more about this cutting edge technology, these programs will enhance your knowledge and performance.