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 .