What is the function of the panel boards supplied by a three-phase, delta-connected system?

In a three-phase, delta-connected system, the panel boards serve to connect various electrical systems and distribute power effectively. The correct function involves ensuring that the high leg, which is found in certain configurations of delta systems, is properly connected to the B phase.

In a delta connection, the three phases are arranged in a triangle formation, which can lead to the high leg configuration. The high leg, typically referred to as the "wild leg," allows for single-phase loads to draw power in addition to the three-phase loads. By connecting the high leg to one of the phases (in this case, the B phase), the system ensures that there's a reliable way to utilize the extra voltage for specific applications, such as delivering additional energy to equipment that requires more power.

This is particularly relevant in systems where the panel board needs to distribute both three-phase and single-phase loads, allowing for flexibility in how power is utilized. This makes understanding how to connect the high leg essential for maintaining the integrity and utility of the electrical distribution system.