What voltage would you read if you cross phase two hot legs on the secondary?

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Study for the Con Edison Test B focusing on Gas Safety, Electrical Theory, and Job Procedures. Utilize flashcards and multiple choice questions, each providing hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

What voltage would you read if you cross phase two hot legs on the secondary?

Explanation:
In a three-phase system, the voltage you read between two hot legs is the line-to-line voltage. If the secondary is a 120/208 V wye system, each leg to neutral is 120 V, and the line-to-line voltage is V_LL = √3 × V_Ph-N = 120 × √3 ≈ 208 V. So crossing two hot legs on the secondary yields about 208 volts. The other voltages correspond to different configurations: 120 V is leg-to-neutral, 240 V would be for a 120/240 V delta or similar, and 480 V for a 277/480 V system.

In a three-phase system, the voltage you read between two hot legs is the line-to-line voltage. If the secondary is a 120/208 V wye system, each leg to neutral is 120 V, and the line-to-line voltage is V_LL = √3 × V_Ph-N = 120 × √3 ≈ 208 V. So crossing two hot legs on the secondary yields about 208 volts. The other voltages correspond to different configurations: 120 V is leg-to-neutral, 240 V would be for a 120/240 V delta or similar, and 480 V for a 277/480 V system.

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