Place partitions for low-voltage cables in cable trays

Use a metal or non-conductive partition to separate low-voltage cables from power cables in a cable tray to prevent interference and maintain safety. Purpose of a PartitionPartitions in cable trays are primarily used to segregate low-voltage (signal or instrumentation) cables from high-voltage or power cables. This separation reduces electromagnetic interference (EMI), preserves signal integrity, and ensures compliance with safety standards.

In dense cabling environments or areas with high electromagnetic fields, partitions are especially important.

Types of Partitions

Metal Dividers: Provide robust separation and can also act as a grounding barrier if properly bonded. Ideal for industrial environments with high EMI.

Non-

Conductive Dividers: Made from plastic or fiberglass, these prevent electrical contact while still separating cables. Suitable where grounding is not required. Adjustable or Modular Partitions: Allow flexibility in cable tray layouts, accommodating different cable sizes and future expansions.

Installation Guidelines

Positioning: Place the partition vertically or horizontally within the tray to create separate channels for low-voltage and power cables. Typically, power cables are on one side and low-voltage cables on the other. Spacing: Maintain adequate spacing between the partition and cables.

Industry practice recommends at least 12 inches (300 mm) between power and low-voltage trays when possible. Tray Type: Use solid-bottom or ventilated trays depending on heat dissipation needs. Solid-bottom trays with partitions are effective in minimizing EMI.

Securing Cables: Use cable ties or clamps to keep cables neatly aligned along the partition, preventing sagging or contact with other cables. Compliance: Ensure the installation follows NEC Article 392 requirements for cable tray systems, including support, grounding, and cable type restrictions.

Best Practices

Route low-voltage cables on the bottom or separate side of the tray to minimize interference from power cables above. Avoid sharp bends near the partition to maintain the minimum bend radius of low-voltage cables. Allow easy access for maintenance and future cable additions by leaving sufficient space along the partition.

By following these guidelines, you can effectively protect low-voltage cables from interference, maintain organized cable management, and comply with safety standards.