2010年11月25日 · NEMA electrical motor starters refer to a standardized rating system for the electrical performance of the most common style of American-built motor starters. NEMA starters are rated by size: 00, 0, 1, 2, 3, 4, 5, 6 and 7. Maximum electrical motor horsepower for different NEMA starters for three phase motors can be found in the table below: