A power transmission assembly includes a first main bus including a first large bus bar and a first small bus bar. The first large bus bar is defined by a cross-sectional area larger than the first small bus bar. The first main bus defines a first axis passing through the first large bus bar and the second small bus bar. The power transmission assembly includes a second main bus including a second large bus bar and a second small bus bar. The second main bus defines a second axis passing through the second large bus bar and the second small bus bar, the second axis being substantially parallel to the first axis. The first main bus is located along a third axis substantially perpendicular to the first axis and passing through each of the first main bus and the second main bus.