In a 230-volt single-phase supply, what is the voltage between a hot line and a neutral?

In a 230-volt single-phase supply, the voltage between a hot line and neutral is indeed 230 volts. In a typical single-phase electrical supply system, the "hot" line carries the voltage while the neutral line provides a return path to complete the circuit. In regions using a standard voltage of 230 volts, there is a direct voltage of 230 volts between the hot wire and the neutral wire.

The options provided that reference 120 volts and 115 volts typically relate to specific electrical systems prevalent in other regions, particularly North America, where standard household voltage is usually around 120 volts. However, in a system specifically rated for 230 volts, it is crucial to understand that the voltage measured between the hot and neutral must equal the system's rated voltage. Thus, the correct understanding is 230 volts, confirming that the voltage between a hot line and a neutral in this specified supply system is accurately represented.