Abstract: A wall-mounted cable sheath asembly defining a raceway for housing and protecting insulated electric cables and the like is disclosed, one part of which comprises a springable channel-shaped housing having an open base produced by a pair of opposed inturned essentially coplanar flanges depending from its divergent sides, the other part comprises a clip for fastening the housing to a supporting surface that has a centrally-located more or less planar web which carries along its top and bottom edges a pair of parallel generally V-shaped flanges, each such flange having divergent outboard wings spaced apart and inclined to form abutments for the sides of the housing when sprung outward and released to spring into place thereagainst, and the free edges of the wings of each such V-shaped flange terminating short of the plane of its own web a distance selected to accept the inturned flanges of the housing that spring into place therebeneath along with the hooked end of the installation tool.