A power distribution system is provided that includes an upper panel, a lower panel, a plurality of side panels, and a plurality of guide rails each having at least two insert slots formed therein that extend along a longitudinal axis of the guide rail. Each of the insert slots is configured to receive and fixedly hold an edge of the side panels. The upper panel and lower panel are each fixedly mounted to an opposite edge face of the guide rails thereby securing the side panels and guide rail between the upper panel and lower panel.