Install a simple pulley system above the cable tray. Tie the new cable to the string and pull (or push) the string through the pulleys. Bill Ebberts Enterprise Electric Problem You need to pull additional cables in a ceiling cable tray using the. 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. Cable ladder systems and cable tray systems shall be manufactured in accordance with BS EN 61537, channel support. Article Summary: A compliant cable tray installation requires a thorough understanding of NEC Article 392, proper structural support, and precise installation techniques. This is why proper planning and execution are. How about organizing your wiring with a cable tray system? Smart move. But before you lay the first tray or clamp down a single cable. Cable tray layout and section design forms a vital component of detailed engineering in electric and power systems.