What formula gives the line voltage in a Delta connected load?

In a Delta connected load, the line voltage and phase voltage are related in a specific way. The line voltage (EL) in a Delta connection is actually equal to the phase voltage (Ep). This is due to the configuration of the Delta connection, where each phase is connected directly between the line conductors.

In this configuration, the voltage across each load or phase is the same as the voltage across the lines supplying the loads. Hence, if you measure the voltage across any two lines (the line voltage), it matches the voltage across the corresponding phase (the phase voltage). Thus, the formula EL = Ep accurately represents this relationship, making it the correct choice in this context.

In contrast, the other formulas demonstrate relationships that apply to different configurations or misinterpretations of voltages in electrical systems, such as in Wye (or Star) configurations, where the line voltage does differ from the phase voltage by a factor of the square root of three.