What is the standard connection type for a three lead AC motor?

The standard connection type for a three lead AC motor is the Wye connection. In this configuration, three winding terminals are connected together at one point, forming a 'Y' shape. This type of connection is commonly used in AC motors because it facilitates a balanced operation and can help reduce the starting current.

When the motor is connected in a Wye configuration, each phase winding is energized with the same voltage, which leads to better performance and smooth operation of the motor. Additionally, Wye connections allow for the use of line-to-neutral voltage, which provides greater flexibility in control and operation.

While other connection types exist, such as straight, common, and split connections, they are not standard for three lead AC motors. The Wye connection is preferred due to its advantages in efficiency and operational characteristics, making it the correct answer in this context.