For example, if the incoming voltage from the grid drops slightly due to high demand in the area, the voltage - regulating device in the power distribution box can boost the voltage to the correct level before distributing it to the circuits. Uni-Directional β They can only change the voltage on the load-side of the regulator and have no effect on the source-side. They are installed in series between the Source and Load. Electricity is carried from the transmission system to individual consumers. Utilities continue to develop new strategies and devise innovative ways to design, engineer and construct substations and transformer equipment. Combined with the increasing.