In order to begin the job, trace a straight line where the trays will pass. This is most appropriately done using a laser level. It casts a clear light beam on the ceiling or wall that will enable an individual to determine whether the course is completely straight before any. But before you lay the first tray or clamp down a single cable, you need a solid plan. Plan the Route Before You Drill No installation should start without a plan. Mark the cable tray route based on your electrical cable tray design and site. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. Instrumentation cable trays are critical for organizing and protecting electrical and signal cables in industrial environments. This section will guide you through the necessary steps to ensure a successful. When offloading tray from a flat deck trailer using an overhead crane, care should be exercised in the placement and length of the slings to prevent crushing the product (siderails).