Steel and Aluminum Trough Tray shall be constructed of a single formed sheet of material, incorporating internal flanges of 7/8”W x 1⁄2”H. Each tray length shall possess four holes per end for the connection of a splice connector or other accessories. ANSI/NFPA 70 - National Electrical Code. 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. us-trations without notice. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned. Legrand continues to be an innovator in cable management solutions and is proud to introduce Cablofil Trough Tray, a cable management system designed to maximize network reliability and minimize lifecyle costs. Our Fiber Trough design utilizes high strength steel components to provide the strength. Please click the appropriate link below to view the catalog section as a PDF. Designed for indoor use, this trough is available in various lengths.