What is the typical primary voltage rating for an additive transformer?

The typical primary voltage rating for an additive transformer is often at or below 8,660 volts. This designation indicates that these transformers are generally used in distribution systems where they step down higher voltages to safer levels for use in residential and commercial applications. Additive transformers are essential in managing voltage levels that align with the requirements of power distribution networks, ensuring that electricity can be safely utilized by the end consumers.

Higher voltage levels, such as those mentioned in other options, are generally associated with different types of transformers or applications, such as transmission systems rather than distribution. Thus, while other ranges of voltage exist, the common threshold for additive transformers is recognized as 8,660 volts or below, making this the correct choice.