A High Voltage Electrical Contractor license is required in Tennessee for electrical projects that exceed $25,000. The course includes highlighting guides, practice tests, theory, calculations, instructor support and test taking tips/strategies. Each time you take a practice test, the questions are randomly generated from our database. @HomePrep is a National Leader in online education. With over 100,000 satisfied students and a course catalog of over 1,000 classes, we are here to help you – Invest in Yourself.