Vertical installation of trough-type cable trays

Installing vertical trough-type cable trays requires proper support, secure fastening, and adherence to NEC standards to ensure safe and reliable cable routing.

Step 1: Planning and Tray Selection

Begin by reviewing the project's Bill of Quantities (BOQ) to confirm tray sizes, weight capacity, and materials. Choose a ventilated trough tray for vertical runs, which provides continuous support for smaller control or instrumentation cables while allowing moderate ventilation . Consider environmental factors such as moisture or corrosive conditions; in such cases, fiberglass-reinforced plastic (FRP) trays may be preferred .

Step 2: Determine Support Locations

Vertical trays must be securely supported to prevent sagging or stress on cables. Supports are typically placed every 1.5 to 3 meters, depending on tray strength and load . For vertical installations, ensure supports are anchored to structural elements such as walls or steel frames. Use brackets or clamps rated for the tray type and load.

Step 3: Mounting the Tray

1. Attach support brackets at the predetermined intervals.
2. Position the vertical trough tray against the supports. Ensure it is plumb and aligned with the intended cable path.
3. Secure the tray using bolts or fasteners compatible with the tray material. For metal trays, consider corrosion protection such as galvanization or paint .

Step 4: Cable Fill and Routing

Calculate the total cable weight per meter and ensure it does not exceed the tray's rated capacity . Follow NEC Article 392 for fill limits, conductor types, and spacing . For vertical runs, secure cables to the tray at intervals using listed cable ties or clamps to prevent movement and stress on the conductors .

Step 5: Bonding and Grounding

Ensure the tray system is properly bonded and grounded according to NEC requirements. This is critical for safety and to prevent electrical hazards . Use bonding jumpers where trays are joined or where metallic trays are interrupted by fittings.

Step 6: Inspection and Maintenance

After installation, inspect the tray for alignment, secure fastening, and proper cable support. Verify that cables are not pinched or rubbing against sharp edges. Vertical trough trays should allow for future cable additions or maintenance without compromising safety .

Additional Tips

• Use ventilated trough trays for smaller cables to prevent sagging.
• Avoid mixing incompatible tray brands or materials without proper adapters .
• Ensure adequate clearance from other services and maintain accessibility for inspection.
• For corrosive or high-moisture environments, consider non-metallic trays for added safety .

By following these steps, vertical trough-type cable trays can be installed safely, efficiently, and in compliance with industry standards, providing a durable and organized cable management system.