When sizing a transformer, which factor is NOT typically considered?

When sizing a transformer, several key factors are typically evaluated to ensure it meets the operational needs effectively. Load requirements are crucial as they indicate the amount of electrical demand the transformer must handle. Voltage levels are also essential, as they determine the necessary transformation of voltage from the primary to the secondary side. Additionally, efficiency and temperature rise are critical considerations; a transformer's efficiency affects energy loss during operation, and manageable temperature rise is important for reliability and longevity.

In contrast, while cost of materials may play a role in the broader decision-making process regarding which transformer to purchase or install, it is not a fundamental factor in the sizing process itself. The priority during sizing is primarily concerned with electrical performance and operational requirements rather than the materials cost. This distinction highlights that the other factors are directly tied to the functional and safety aspects of the transformer’s operation, while cost considerations typically come into play after the sizing process is established to meet those specifications.