What is the voltage from any hot line to ground or neutral on a 480 volt WYE power supply?

In a 480 volt WYE (or star) power supply system, the line-to-line voltage is 480 volts. In a WYE configuration, the voltages from each hot line to the neutral (or ground) are determined by the phase relationships in the system.

For a three-phase system, to find the voltage from any hot line to the neutral, you would divide the line-to-line voltage by the square root of 3 (approximately 1.732). Thus, the calculation for the voltage from a hot line to ground or neutral is:

Voltage (hot to neutral) = Voltage (line-to-line) / √3

Voltage (hot to neutral) = 480V / √3

Voltage (hot to neutral) ≈ 277V

Therefore, the voltage from any hot line to ground or neutral in a 480 volt WYE power supply is indeed 277 volts. This makes choice C the correct answer, as it accurately represents the relationship between line-to-line voltage and line-to-neutral voltage in a three-phase WYE system.