3 Phase Distribution Board Installation | 3 Phase Distribution Board Wiring Diagram In this video, learn how to professionally install a 3 Phase Distribution Board with complete wiring and load distribution setup. Each phase in a 3 phase db box carries alternating current (AC) with a phase shift of 120 degrees between them. This allows for more efficient power distribution and balanced loading across the three phases, resulting in better power quality and reduced energy losses. Overall, a 3 phase db box is. A distribution board is the combination of protective devices such as Main switch, MCB, MCCB, RCD, RCBO, Isolator, Fuses and Switches etc. The three-phase distribution board is used to distribute power to the three-phase loads and circuits such as three-phase motors, three-phase machinery, three-phase to. In our today electrical wiring installation tutorial, we will show how to wire and install a Three Phase distribution board and Consumer Unit from utility pole to a 3-Phase Energy Meter & 3-Phase Distribution board.