What is the voltage between B phase and ground in a 240-volt ungrounded delta?

In a 240-volt ungrounded delta system, the voltage between any phase (such as B phase) and ground is effectively zero volts. This is because, in an ungrounded delta configuration, there is no direct connection to the ground for any of the phases. The phases are 120 degrees apart in their electrical cycles, which means they can have value potentials of 240 volts between any two phases, but when measuring the voltage of a phase to ground, it does not have a definitive reference point, hence resulting in 0 volts.

This ungrounded setup allows the system to operate without a neutral, but it can pose some safety risks if not managed properly since there is no ground reference. The lack of a ground connection means that phase voltages are not referenced to the ground, leading to the conclusion that measuring the voltage of B phase against the ground yields zero volts.