Which of the following is NOT typically found on a motor's nameplate?

The correct choice is that the manufacturer's contact information is typically not found on a motor's nameplate. A motor's nameplate primarily provides essential technical specifications and operational characteristics crucial for understanding the motor's capabilities and ensuring proper use and installation.

The service factor indicates the motor's ability to handle overload conditions without damage, which is critical for users during operation. The horsepower rating specifies the output power of the motor, a key performance metric that helps in selecting the right motor for an application. Operating temperature range is also crucial as it guides the user on the safe limits for the motor’s operation, ensuring reliability and preventing overheating.

While some manufacturers may choose to include their contact information for customer support purposes, it is not standardized across all nameplates, making it less integral compared to the other specifications that directly relate to the motor's performance and safety.