What is the maximum horsepower for single phase motors typically mentioned?

The typical maximum horsepower for single-phase motors is commonly accepted at 5 horsepower. While larger horsepower ratings such as 7.5 hp, 10 hp, or 15 hp can exist, they typically are not classified as single-phase motors due to limitations in the design and starting capabilities of single-phase systems. Single-phase motors become less efficient and more complicated to start as horsepower increases, leading to a preference for three-phase systems in applications requiring more power. The design constraints and performance issues associated with higher horsepower limits make 5 hp the widely recognized maximum for reliable single-phase motor operation. This standard is based on both efficiency and practical application in common settings.