What is the voltage from phase to ground in a 480V transformer?

In a 480V three-phase system, the phase-to-ground voltage is calculated based on the relationship between line voltage and phase voltage in a three-phase configuration. In a typical three-phase system, the line voltage (between any two phases) is equal to the phase voltage multiplied by the square root of three (approximately 1.732).

Given that the line-to-line voltage is 480 volts, you can determine the phase-to-ground voltage using the formula:

Phase-to-ground voltage = Line voltage / √3

So, it would be calculated as follows:

Phase-to-ground voltage = 480V / 1.732 ≈ 277V

This result, 277 volts, represents the voltage from each phase to ground in this system. It is important for understanding electrical systems, as the phase-to-ground voltage is commonly used for various calculations and wiring configurations in electrical installations.

In this context, 277 volts as the correct answer is derived from standard electrical theory regarding three-phase systems, making it crucial for proper application and understanding of electrical systems in practice.