A system for mounting conductors, such as electrical wires, optical fiber cables, conduits and the like, to the floor beams of an aircraft cabin floor, having: an elongate raceway a longitudinal routing rails spanning between adjacent pairs of floor beams, each routing rail having an interior channel for housing conductors; conductor cradle blocks disposed in the interior channel, each cradle block including a mounting cushion adapted to engage a bottom portion of said conductors; and rail support brackets, each rail support bracket removably clamped on at least one of: the top flange; the bottom flange; and the web of a beam and removably mounted to the rail ends.