Most electricians learn their trade in a 4-year apprenticeship. For each year of the program, apprentices must complete at least 144 hours of technical training and 2,000 hours of paid on-the-job training. In the classroom, apprentices learn electrical theory, blueprint reading, mathematics, electrical code requirements, and safety and first-aid practices. Some electricians start out by attending a technical school. Many technical schools offer programs related to safety and basic electrical information. Graduates usually receive credit toward their 4-year apprenticeship.