Refer to a transformer that supplies 120/208 volts on its secondary windings. This means that each winding (X1 to X2 or X3 to X4) is supplying ___ volts.

Prepare for the Independent Electrical Contractors (IEC) Year 4 Exam. Access flashcards, multiple choice questions, and detailed explanations. Enhance your readiness and achieve your certification!

Multiple Choice

Refer to a transformer that supplies 120/208 volts on its secondary windings. This means that each winding (X1 to X2 or X3 to X4) is supplying ___ volts.

Explanation:
Each winding supplies 120 volts. In a 120/208 V secondary, the 120 V is the voltage across an individual coil (phase-to-neutral in a typical 3-phase wye connection), while the 208 V refers to the line-to-line voltage between two phases, which is √3 times 120 V. So measuring across a single winding like X1–X2 or X3–X4 gives 120 V.

Each winding supplies 120 volts. In a 120/208 V secondary, the 120 V is the voltage across an individual coil (phase-to-neutral in a typical 3-phase wye connection), while the 208 V refers to the line-to-line voltage between two phases, which is √3 times 120 V. So measuring across a single winding like X1–X2 or X3–X4 gives 120 V.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy