What is the line-to-line voltage if the line-to-neutral measures 120 VAC?

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Multiple Choice

What is the line-to-line voltage if the line-to-neutral measures 120 VAC?

Explanation:
In a three-phase wye system, the line-to-line voltage is the line-to-neutral voltage multiplied by the square root of 3. So with a line-to-neutral of 120 V, the line-to-line voltage is 120 × √3 ≈ 207.8 V, which is commonly given as 208 VAC. This reflects the typical 120/208 V systems used in many buildings. The line-to-neutral value is 120 V, not the line-to-line voltage, and the other numbers don’t match the 120 V × √3 relationship for a wye-connected system.

In a three-phase wye system, the line-to-line voltage is the line-to-neutral voltage multiplied by the square root of 3. So with a line-to-neutral of 120 V, the line-to-line voltage is 120 × √3 ≈ 207.8 V, which is commonly given as 208 VAC. This reflects the typical 120/208 V systems used in many buildings. The line-to-neutral value is 120 V, not the line-to-line voltage, and the other numbers don’t match the 120 V × √3 relationship for a wye-connected system.

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