The Trapeze or swing support is the most common type. Thread hex nut 25 mm (1") to 50 mm (2") above location of the tray bottom. The cross member comes next followed by a second set of square washers. All vertical hangers will project through the cross member. Efficient cable tray installation and proper cable handling are critical for ensuring the reliability and safety of electrical systems. Cable Tray Installation Cable trays should be installed in accordance with the latest revision of the NEC, NEMA VE. We have more than a decade's worth of experience making and designing quality cable tray and cable management systems. The Cable Tray ng standards, performance standards, test standards and application in this document have been tested extens ompetent professional en completely installed, without damage either to conductors or. Below is the detailed cable tray installation method statement not only for cable tray but also applicable for GI ladder and trunking for indoor and outdoor applications and in service rooms like pump rooms, electrical rooms and plant rooms etc. All materials intended for cable tray, ladder and. 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.