Ambient Temperature Rise

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The ambient temperature rise is also called the Celsius rise. It's the amount of temperature rise the motor can withstand during normal operation. This value is listed in degrees Celsius (°C). A typical open motor can withstand a rise of 40°C (104°F) and an enclosed motor can withstand a 50°C (122°F) rise. This means the motor should not be exposed to environments where the temperature is 104°F above the ambient. If the ambient is considered 72°F, it means the motor is limited to temperatures of 176°F. Another classification that will help determine the amount of temperature a motor will be able to withstand is the type of insulation the motor winding has. The classes of insulation that are used with motors and the amount of temperature these classes can handle are listed here.

Insulation Class

NEMA Design