Crystal Cable trays are components of support systems for power and communications cables and wires. A cable tray system supports and protects both power and signal cables and facilitates upgrading, expanding, reconiguring, or relocating networks. Most of these systems are open, allowing eficient heat dissipation and easy access for replacement and repairs. Although typically suspended from ceilings or afixed to walls, some cable tray systems are suitable for underloor use. Tray systems are alternatives to wireways and electrical conduit, which completely enclose cables.