A cable management system for managing electrical cables in a raised floor grid system is provided. The cable management system includes a cable enclosure including side walls and a base together defining an enclosure cavity. Each of the side walls defines a cable opening and a plurality of bracket openings in communication with the enclosure cavity. The cable management system also includes a sealing assembly installed in each of the cable openings, and a plurality of equipment brackets mountable to the sidewalls via the bracket openings, which are configured to enable mounting of the equipment brackets in vertical and angled orientations. The cable management system further includes a plurality of support brackets connectable to support structure of the raised floor grid system for supporting the cable enclosure on the support structure. The cable enclosure can be installed in the raised floor grid system by removing only a single floor tile.