The main cable pathway system serving a particular floor of a building is referred to as the horizontal distribution infrastructure. Additional raceway or conduit may be necessary in order to reach individual communications outlet locations at the work spaces. The use of air plenum spaces for horizontal distribution infrastructure should be avoided. The cable necessary to meet fire code requirements is many times more expensive than regular cable. It is essential that this infrastructure be flexible and accessible.
Cable tray is preferred, although metal raceway is acceptable.
Alternatively, the tray may be sized to provide 1 square inch of cross section for every 100 square feet of floor area served. If the cable tray traverses an inaccessible area, such as a fire resistant sheet rock ceiling area, the tray shall have solid sides and bottom and no top. Alternatively, an equivalent cross section of conduit may be provided to span the inaccessible area. Raceway may be located along the top of corridor walls, just below any false ceiling. Raceway may be used above the false ceiling as well, and may be mounted so that the top cover is removable at any point.