What does the term "line voltage" refer to?

The term "line voltage" refers specifically to the voltage measured between two phases in a three-phase electrical system, which is why phase to phase voltage is the correct interpretation. In a three-phase system, line voltage is greater than phase voltage due to the relationship between how voltages are distributed across the phases. This measurement is essential for ensuring that equipment operates under proper electrical conditions and for maintaining system balance in three-phase circuits.

Understanding line voltage is crucial in applications involving three-phase power, as it's often used for larger motors and industrial equipment. The concept is key for electricians and linemen because it impacts how they calculate needed voltage ratings and ensure efficient and safe electrical installations.

The other terms provided, such as voltage across a single phase, neutral to ground voltage, and voltage drop across a transformer, refer to different measurements and phenomena in electrical systems. Each has its own specific context and application, but they do not reflect the full voltage measured between two phases, which defines line voltage.