Calculate horizontal, vertical, or compound cable tray offsets based on bend angle, offset distance, and available installation space. 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. 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. OBO BETTERMANN has offered prod-ucts and solutions for electrical instal-lation for over 100 years. With our many years of experience, we are one of the leading manufacturers in this field. The Cable Tray system is installed in electrical rooms, plant rooms, and service corridors. Our knowledgeable production team works closely with each customer to provide quality solutions based on your schedule and budget.