What is the term for the voltage between any two phases?

The term for the voltage between any two phases in a three-phase electrical system is known as line voltage. Line voltage is a crucial concept in electrical power systems, as it is the voltage that exists between any two conductors (or phases) of the supply. In a three-phase system, there are usually three lines (or phases), and the voltage between any two of them constitutes the line voltage.

Line voltage is typically higher than phase voltage, which is the voltage measured across a single phase to neutral. This distinction is important for understanding how three-phase systems operate, especially in regards to load calculations, power distribution, and equipment ratings. Knowing the line voltage is essential for designing and troubleshooting electrical systems, as it dictates the capacity and insulation requirements for wires and other components in the system.

In summary, line voltage represents the inter-phase voltage critical for the efficient operation and functioning of three-phase electrical systems.