A power distribution unit disclosed herein includes a plurality of power outlets arranged in adjacent columns, the first and the second terminals of the power outlets in a first column formed along a first line, the first and the second terminals of the power outlets in a second column formed along a second line, ground terminals of the power outlets in the first column formed along a third line, and ground terminals of the power outlets of the second column formed along a fourth line, wherein the first line, the second line, the third line, and the fourth line are arranged in parallel, and wherein the plurality of power outlets are arranged in one of an arrangement in which the third and fourth lines are positioned between the first and second lines, and an arrangement in which the first and second lines are positioned between the third and fourth lines.