In a 277/480V 4-wire electrical system, the expected voltage reading between a phase conductor and the neutral is approximately 277 volts.
Step-by-step explanation:
When using a voltmeter to measure voltage in a 277/480V 4-wire electrical system, the expected voltage reading between one phase conductor and the neutral is approximately 277 volts. This system is designed such that each phase to neutral provides a lower voltage, typically about half of the phase-to-phase voltage. In a 277/480V system, the phase-to-phase voltage is 480 volts, so the phase-to-neutral voltage will be around 277 volts.