Supports should be placed within 24 in. This guide covers every cable tray type recognized by the NEC, fill calculations, permitted cables, support spacing, grounding, and the common installation mistakes that lead to failed inspections. What Is Cable Tray? What Is Cable Tray? Cable tray is a structural support system consisting of a. Ladder Cable Trays are a type of cable tray in the shape of a ladder. For the installation of single conductor cables sized 1/0 AWG to 4/0 AWG in industrial establishments, the NEC specifies the maximum allowable rung spacing for the cable. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports.
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