Typically, power transformers have a component that comes in at least two different sizes. Which component is this?

• A. Taps
• B. Bushings
• C. Cores
• D. Insulators

Answer: (B)

Power transformers use bushings to carry conductors from inside the tank to the external circuit while keeping the high-voltage insulation intact. These bushings are produced in different sizes to match the transformer’s voltage rating and physical mounting needs. A higher voltage class requires longer insulators and greater creepage distances, plus different flange or connection sizes, so you’ll see bushings of various sizes on different transformers. This is why the component that typically comes in more than one size is the bushing—it directly reflects the need for different insulation and mounting requirements across voltage levels.