Horizontal Runs: Cables should be secured at their start, end, and turns, and every 3 to 5 meters along straight horizontal sections. The spacing between trays, whether horizontal or vertical, depends on various factors like cable type, environment, and tray material. Proper installation can significantly reduce electromagnetic interference, prevent fire hazards, and improve overall efficiency. This article provides an in-depth. AFTER FIREPROOFING AND INSULATION IS INSTALLED 4. NOMINAL MINIMUM SEPARATION BETWEEN CONDUITS OF REDUNDANT ELASS IE DIVISIONS IS C INCHES LE MANI ERRATE REDUCED TO | INCH FOR CONDUITS ROUTED THROUGH WALL AND FLOOR PENETRATIONS, AND ON CONCLIIT RUNS WHERE THE SEISMIC ATTACHMENT CRITERIA, AS SHOWN. When wiring in non-explosive hazardous areas, the safety spacing between different types of cables varies depending on factors such as the type of cable and the method of installation. Below are some common safety spacing requirements: 1. Parallel Wiring of Power and Low Voltage Cables 130mm if. Support spacing for cable trays must align with the manufacturer's instructions, as outlined in NEC 392. Clause 522-08-04 Where conductors or cables are not supported. Trays support large numbers of power and control cables, while conduits offer mechanical protection, especially in exposed or hazardous environments. The International Electrotechnical Commission (IEC) develops.