De-mythizing Specifying of Cable Tray

摘要

One of the nicest benefits of a cable tray system is its flexibility. Since a cable tray system is an open one, you don't have to de-rate cables because of airflow. (The open tray allows the heat to dissipate.) However, in a closed system, such as with power cables in conduit, you have to allow for heat buildup and therefore have to derate the cables. Yet many specifiers continue to specify covers for cable tray when they don't need them. This "conduit syndrome" defeats a key advantage of cable tray—the easy access to the cables.