Class F or H insulated motors are commonly used in which type of applications?

Class F or H insulated motors are specifically designed to operate at higher temperature ratings, making them ideal for high temperature applications. These insulation classes allow the motors to withstand more extreme heat without degrading their performance, thereby ensuring reliability and longevity in environments where temperatures can become elevated, such as in certain industrial or commercial settings.

In contrast, other options do not align with the intended applications for Class F or H insulation. For instance, low temperature applications would typically require insulation that can handle cooler environments more effectively, while residential energy-efficient motors focus more on efficiency ratings and may not be rated for high temperatures. Similarly, portable small engines often use different motor types and insulation classes suitable for their specific operational demands. Thus, high temperature applications are where Class F or H insulated motors excel.