What are the coil voltages in a 3Ø, 4-W supply system delivering 120/240 volts?

In a three-phase, four-wire supply system delivering 120/240 volts, the coil voltage refers to the voltage between any line and neutral (ground). In this case, the voltage is split into two levels: 120 volts and 240 volts. The 120 volts are typically the voltage measured between one phase (or line) and the neutral point, while the 240 volts would be the voltage measured across two phases.

In a typical three-phase system using a wye (Y) configuration, you have one line connected to neutral at 120 volts, and when you measure across two phases, you obtain the higher voltage of 240 volts. This higher voltage is essentially the line-to-line voltage achieved by combining two phases, which is indicative of a split-phase system frequently found in residential wiring.

Thus, in this context, the coil voltage specifically relevant to the question would refer to the typical voltage seen in practical applications, which confirms that 240 volts is an accurate and appropriate answer in describing the system's capabilities.