This guide covers the critical steps, from selecting the right electrical cable tray and performing accurate cable fill calculations to managing a safe cable pull through and ensuring all bonding and grounding requirements are met. How to design cable tray? Most projects are roughly defined at the start of cable tray design. For projects that are not 100 percent defined before design start, the cost of and time used in coping with continuous changes during the engineering and drafting design phases will be substantially less. This article shares simple ways to plan your cable trays and wiring. What is Cable Tray Design and Wiring Planning? At its heart, Cable Tray Design, Layout means choosing and. Is your cable tray system optimized for safety, dependability, space and cost savings? Cable tray (or cable ladder) systems are a popular alternative to electrical conduit systems, as they have an outstanding record for dependable service, design flexibility and cost savings in commercial and. Cable tray system designing is not just about holding wires, but it is all about maintaining a building safe. A poor plan will result in cable sag or metal breakage. The following pages address the 2011 National Electric Code® requirements for cable tray systems as well as design solutions from practical experience. The information has been. 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.