How to install fixed elbows on cable trays

Elbows in cable trays are installed by aligning the angled sections, securing them with couplers or splice plates, and providing proper support according to manufacturer and NEMA VE 2 guidelines.

Step-by-

Step Installation1. Plan the Route and Mark Locations Before installing elbows, determine the cable tray path and mark the locations for bends, tees, or elevation changes. Use a chalk line or laser level to ensure accurate alignment along walls, ceilings, or supports.

2. Select the Correct Elbow Type Choose the elbow that matches the tray type (ladder, ventilated, or solid-bottom) and the required angle (typically 45° or 90°). Ensure the elbow is compatible with the tray width and material.

3. Position and Align the Elbow Place the elbow between the two straight tray sections. Ensure the ends of the elbow are flush with the straight sections and that the center dividers or rungs are aligned for smooth cable routing.

4. Connect Using Couplers or Splice Plates Insert the ends of the elbow into the couplers or splice plates provided by the manufacturer. Tighten the fasteners, such as T-bolts or thumb screws, ensuring the wings of the bolts remain inside the side channels for secure attachment.

Finger-tighten initially, then fully tighten after confirming alignment. 5. Provide Adequate Support Support the elbow according to NEMA VE 2 and manufacturer specifications.

Typically, supports should be placed near the elbow ends and at intervals along the tray span. Avoid placing connectors directly at the center of unsupported spans. For long runs or outdoor trays, expansion connectors may be required every 30 meters (100 ft) to accommodate thermal expansion.

6. Bonding and Grounding Install bonding jumpers at each elbow and expansion joint to maintain electrical continuity. Ground the tray system at intervals of 15 meters (50 ft) and at both ends, ensuring all elbows are electrically bonded to the tray.

7. Verify and Adjust Check that the elbow is level, aligned with the tray path, and securely fastened. Ensure there are no sharp edges that could damage cables.

Adjust supports or fasteners as needed before laying cables. 8. Cable Installation Once the elbow is installed and secured, route the cables through the tray, maintaining proper spacing and fill ratios.

Avoid overfilling and ensure smooth bends to prevent cable damage. By following these steps, elbows in cable trays can be installed safely, securely, and in compliance with electrical codes and manufacturer guidelines. Proper planning, alignment, and support are key to maintaining system reliability and ease of future maintenance.