In a 480 VAC three-phase wye system with a neutral, what are the phase-to-phase and phase-to-neutral voltages?

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Multiple Choice

In a 480 VAC three-phase wye system with a neutral, what are the phase-to-phase and phase-to-neutral voltages?

Explanation:
In a three-phase wye system with a neutral, the line-to-line voltage is √3 times the line-to-neutral (phase) voltage. So if the phase-to-phase (line-to-line) voltage is 480 V, the phase-to-neutral (line-to-neutral) voltage is 480 ÷ √3 ≈ 277 V. This is the standard 480Y/277 V configuration: 480 V between lines and about 277 V from each line to neutral. The 277 V value differs from 240 V in other system configurations, such as a 240 V line-to-line setup.

In a three-phase wye system with a neutral, the line-to-line voltage is √3 times the line-to-neutral (phase) voltage. So if the phase-to-phase (line-to-line) voltage is 480 V, the phase-to-neutral (line-to-neutral) voltage is 480 ÷ √3 ≈ 277 V. This is the standard 480Y/277 V configuration: 480 V between lines and about 277 V from each line to neutral. The 277 V value differs from 240 V in other system configurations, such as a 240 V line-to-line setup.

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