What is the voltage between two hot lines in a 230-volt AC system?

In a 230-volt AC system, the voltage between two hot lines is indeed 230 volts. This is because in such a system, the two hot wires are at different phases, and when measured together, they provide the full voltage of the supply.

In AC systems, especially those used in commercial and residential applications, the standard voltage levels are designed around these configurations. A 230-volt system typically uses two lines that supply alternating current and are 180 degrees out of phase, yielding the sum of their potentials when measured between them.

Understanding this concept is crucial when working with electrical systems, as the voltage between these two lines directly determines the voltage supplied to equipment and appliances connected to the system. In practice, knowing the proper line-to-line and line-to-ground voltages is essential for ensuring safe and effective operation of electrical equipment.