Spacing Standards: Electrical (power) and instrumentation (signal/control) cable trays should maintain a minimum vertical and horizontal distance. The selection of material and finish is a function of the environment in wh tant in a wide range of environments, and easily formable (Appendices II and III). The spacing between trays, whether horizontal or vertical, depends on various factors like cable type, environment, and tray material. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. 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. This work is licensed under the Creative Commons Attribution-Noncommercial-NoDerivs 3. 0 IGO-ported license (CC BY-NC-ND 3. You are free to share this work (copy, distribute and transmit) under the following conditions: you must give credit to the ITER Organization, you cannot use the work.