Abstract: A raceway structure which is fixedly attached to and extends longitudinally along one horizontally extending edge of a panel assembly. The raceway structure includes a U-shaped channel member which resiliently but releasably snaps into engagement with longitudinally spaced supports which are fixed to and project downwardly from the bottom frame rail of the panel. The supports occupy only minimal space within the channel member. The raceway channel member is provided with increased height relative to its width to provide upper and lower interior channel regions which accommodate power and telecommunication cabling systems. The supports are releasably engaged with upper edges of the channel member and provide the primary support for securing the channel member to the panel.