A 3Ø, 4-W supply system delivering 277/480 volts has a neutral. Is this statement true or false?

The statement is true because a 3-phase, 4-wire system inherently includes a neutral conductor as part of its configuration. In such a system, the four wires consist of three phase conductors and one neutral conductor. The presence of the neutral allows for the delivery of both line-to-line and line-to-neutral voltages. In this case, the 277 volts refers to the line-to-neutral voltage, and the 480 volts refers to the line-to-line voltage in a 3-phase system. This arrangement is particularly useful for supplying both three-phase loads and single-phase loads, since the neutral can carry any unbalanced load between the phases. Thus, the system does indeed have a neutral, supporting the truth of the original statement.