Final answer:
The voltage between any phase and neutral on a common three-phase, four-wire service should be 120 volts. This is typical for residential power systems in North America, with power companies stepping down higher voltages to this level for home use.
Step-by-step explanation:
On the most common three-phase, four-wire service, the voltage between any phase and neutral should be 120 volts. This setup is typical in North America where the power distribution system uses 120 volts for standard household outlets. The three-phase power system is designed to supply power for heavy-duty equipment as well as for typical residential use. The voltage mentioned is the 'line-to-neutral' voltage for a system where the 'line-to-line' voltage is often 208 volts. The power companies transmit electricity at higher voltages to limit energy losses and step it down using transformers to 120 volts for residential use, where the neutral wire is earthed to ensure safety.