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. OBO BETTERMANN has offered prod-ucts and solutions for electrical instal-lation for over 100 years. Cable ladder systems and cable tray systems shall be manufactured in accordance with BS EN 61537, channel support. As buildings contain more and more devices and systems requiring structured cabling, the need for sturdy cable tray supports is growing. What can we offer? Technical designs, advice and. LADDER TRAY IS A MECHANICAL SUPPORT SYSTEM FOR CABLES AND IS NOT TO BE USED AS A WALKWAY, LIFTING APPARATUS OR LADDER. CAUTION MUST BE EXERCISED WHEN. The PHP Cable Tray Support is designed for cable systems of various widths at most specified heights above the roof surface. Layout isolation pads, (provided by contractor), according to the design and layout. Space. A Channel Support System (Figures 3) is a standardised system used in the construction and electrical industries for light structural support, often for supporting wiring, plumbing or mechanical components such as air conditioning or ventilation systems.