In a 3Ø, 4-W supply system delivering 120/208 volts, is there a neutral present?

In a 3-phase, 4-wire supply system that delivers 120/208 volts, a neutral wire is indeed present. This type of system typically consists of three phase conductors and one neutral conductor. The neutral serves multiple purposes, including providing a return path for unbalanced loads and allowing for the delivery of different voltage levels: both 120 volts (between any phase conductor and the neutral) and 208 volts (between two phase conductors).

In a balanced load scenario, the currents in the three phases can cancel each other out, resulting in little to no current flowing through the neutral. However, the neutral is crucial for the functioning of single-phase loads connected to the system. Therefore, the presence of a neutral is inherent in the design of a 3-phase, 4-wire system regardless of load or specified conditions. This is important for ensuring safety and compliance with electrical codes.

The correct answer reinforces the structured nature of a 3-phase system, emphasizing the essential role of the neutral wire in providing effective and safe electrical distribution.