What is the phase-to-phase voltage rating of a primary system rated at 7200 volt 3-phase 3-wire?

In a three-phase system, the phase-to-phase voltage can be determined by understanding the configuration of the system. A primary system rated at 7200 volts refers specifically to the line-to-neutral voltage, which is used in such systems.

In a three-phase 3-wire system, the phase-to-phase voltage can be calculated using the formula:

[ V_{LL} = \sqrt{3} \times V_{LN} ]

Where ( V_{LL} ) is the line-to-line (or phase-to-phase) voltage and ( V_{LN} ) is the line-to-neutral voltage. However, in this scenario, if the system is specified as 7200 volts for a primary system in a 3-phase configuration, it indicates that this value is understood as the line-to-line voltage when using three wires without a ground.

Thus, when asked for the phase-to-phase voltage, it is simply the voltage rating provided, which verifies that it is indeed 7200 volts in this configuration. Therefore, stating 7200 volts as the phase-to-phase voltage rating aligns with the definition used for primary distribution in three-phase systems.

This makes the other options not fit the description of the system, as they imply different