Secure cables in trays or conduit and fasten with hook-and-loop ties to prevent compression. Outdoor cable may be direct buried, pulled or blown into conduit or innerduct, or installed aerially between poles. Indoor cables can be installed in raceways, cable trays above ceilings or under. Many new high voltage distribution lines have optical fibers in the center of the ground wire (OPGW - optical power ground wire) that are used for grid management and communications, sometimes even leasing lines to telcos for long distance signals. Utilities also use fiber in substations for. Fiber optic cable installation may take place either indoors or outdoors according to several different types of installation processes. This guide assists you in the selection of the appropriate tray to guard these lines. What do we mean by the “installation process?” Assuming the design is completed, we're looking at the process of physically installing and completing the network, turning the design. If you've worked in data center installation long enough, you know that open basket cable trays present unique challenges for fiber optic raceway installation. Unlike solid-bottom trays that provide continuous support, the open mesh design creates sharp edges, inconsistent support points, and.