The Cable Tray Institute is making available the current edition of this practical guide for the proper installation of aluminum or steel cable tray systems. These guidelines will be useful to engineers, contractors, and maintenance personnel. B manufactures its cable tray in a range of materials with a variety of finishes. This section will guide you through the necessary steps to ensure a successful. We recognize the need for a complete cable tray reference source for electrical engineers and designers. Below are 100 questions that comprehensively cover the basic definitions, material classifications, selection. Article Summary: A compliant cable tray installation requires a thorough understanding of NEC Article 392, proper structural support, and precise installation techniques.