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NFPA 70 – The National Electrical Code covers the installation requirements for the safe application of cable tray systems including ladder, ventilated trough,The following recommendations are intended to be a practical guide to ensure the safe and proper installation of cable ladder and cable tray systems. These guidelines and information do not intend to cover all details or variations in cable tray systems nor provide for every possible installation contingency. Cable Tray Wiring System Design and Installation Hints . reference guide for both those unfamiliar and those experienced with cable tray. This article is intended only as a practical guide for installers and its Center hung tray supports allow for quicker and easier cable installation by HOW TO SPLICE CABLE TRAY. 8-9. JONCTION DE CHEMINS DE CÂBLES / CÓMO EMPALMAR. BANDEJAS PORTACABLES. INSTALLATION EXAMPLES.