Final answer:
A 3Ø, 4-W supply system delivering 277/480 volts has line-to-line voltages of 480 volts. This voltage is measured between any two of the system's three phases. It's typical for commercial and industrial applications.
Step-by-step explanation:
When a 3Ø, 4-W supply system delivers 277/480 volts, the system has line-to-line voltages that are 480 volts. This refers to the voltage that is present between any two of the three phases in a three-phase system. This value is specifically referred to as the line-to-line or phase-to-phase voltage.
For example, when the power is generated at a power station, it is stepped up to a significantly higher voltage before being transmitted over long distances. This is done to minimize power losses along the way. When the power eventually reaches its destination, a substation steps down the voltage into safer ranges for use in homes or businesses. In this case, the 3Ø, 4-W supply system results in a line-to-line voltage of 480 volts, which is typical for many commercial and industrial applications.
Learn more about 3Ø, 4-W supply system