________ describes a low-voltage range that includes 120/240, 240/480, 120/208, and 277/480.

• A. Primary
• B. Secondary
• C. Tertiary
• D. Feeder

Answer: (B)

The voltages listed are all typical low-voltage outputs you’d get from the secondary winding of a distribution transformer that feeds building power. The primary side carries the high voltage, while the secondary provides voltages like 120/240, 120/208, 277/480, or 240/480 for lighting and outlets. That’s why this describes the secondary: it’s the low-voltage side that delivers the usable voltages to circuits and equipment. Feeder and tertiary terms don’t capture this broad handheld of common low-voltage outputs on the transformer’s secondary, so the secondary is the best fit.