Trays for cables of different voltage levels should be stacked in descending order with the higher voltage. At least 12 inches of clear space should be provided between tray levels. Maintaining proper separation between power, data, and limited energy cabling is foundational to system performance, safety, and code compliance. Separation isn't just an EMI precaution — it protects signaling, reduces rework, and ensures pathways meet inspection expectations across risers. NEC Article 392 outlines the key rules for installing and maintaining industrial cable tray systems. These systems, made from metal or plastic, are open structures designed to support electrical conductors, ensuring proper organization and safety. Below are some common safety spacing requirements: 1. Parallel Wiring of Power and Low Voltage Cables 130mm if. In industrial settings, electrical and instrumentation (E&I) cable trays or bridge racks play a critical role in organizing and supporting power, control, and signal cables across facilities. For the "lower" voltages (i. low level instruments on one side of a tray with a metallic divider then 120VAC on the other side of the same tray) sometimes power can be in the same tray. here we only do this with digital signals (on/off. en completely installed, without damage either to conductors or structural system use maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray.
