Raceway modules of predetermined length are joined by couplers designed to allow optional gaps between the T-shaped raceway base plate portions. Upper and lower L-shaped raceway covers are separately snapped out the base, allowing electrical and data/communication devices to be provided in staggered relationship, and anywhere along the raceway. The lower L-shaped raceway cover configuration allows outlet devices to be provided in the lower side of the raceway. The T-shaped base plate has prepunched knock-out openings and mounting holes provided in a predetermined pattern, and prepunched lines of weakening, that simplify the installation process. The couplers come in several lengths and configurations, to bridge crossing raceway or other obstructions, and to provide continuity in the gaps between the raceway modules. Prewired cover components are fitted with spaced outlet devices for installation in areas of a room that require such service.