Three-phase load center

摘要

A three-phase load center which has a base pan including a first and a second bus bar for a first and a second phase. The bus bars are positioned on the top surface of the base pan. A third bar for a third phase is positioned beneath the base pan such that the bus bar is in contact with the bottom surface of the base pan. An insulator is connected to the base pan such that the third bus bar lies between the base pan and the insulator. The base pan and the third bus bar are each provided with ribs and grooves. These ribs and grooves cooperate to form ventilation passageways.