What aspect of a transformer does the nameplate specify regarding its operation?

The nameplate on a transformer is crucial for understanding its operation since it provides various key specifications, among which voltage ratings are prominently featured. These ratings indicate the primary and secondary voltages the transformer is designed to handle, ensuring safe and efficient performance in its intended application. By knowing the voltage ratings, linemen can make informed decisions regarding transformer installation and operation, ensuring compatibility with the electrical system and preventing damage or failure.

Other aspects listed, like initial cost, service life, and manufacturer's location, while important in a broader context of transformer selection and maintenance, are not typically specified on the transformer nameplate. Therefore, the focus on voltage ratings highlights the operational parameters necessary for the safe and effective use of transformers in electrical systems.