These special heavy duty tray hold down cable tray clamps and expansion guides are ideal for fastening tray to C-Channels and beams, such as those found on bridges. They are easy to install and reduce field labor costs since the beam clamp set screws eliminates the need to drill. OBO BETTERMANN has offered prod-ucts and solutions for electrical instal-lation for over 100 years. Our focus has always been on solutions from the field of cable support systems. Our product range includes stainless steel cable trays, galvanised cable trays, and wire cable trays, available in multiple cable tray types —. Production at the factory is observed using modern practices of manufacturing methods in the steel construction industry with a definite compliance to international standards of fabrication. SFSP has manufacturing facilities in KSA, UAE, Egypt, and Lebanon. 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. Cable tray systems are engineered support structures designed to route, support, and protect insulated electrical cables used for power distribution, control, instrumentation, and communication.