Cable tray entry elbows should be installed with proper alignment, secure support, and correct fastening to ensure safe and efficient cable routing.

Step 1: Plan and Prepare

Before installation, plan the cable tray route and determine where elbows are required to change direction. Ensure the path allows for proper cable bending radius and clearance from other structures, and select the correct elbow type (horizontal or vertical) based on your layout and cable specifications .

Step 2: Position the Elbow

Place the entry elbow at the junction where the cable tray changes direction. Align it flush with the adjoining tray sections, ensuring the elbow's flange or side rails are properly seated against the tray edges . Check that the elbow orientation matches the intended cable path.

Step 3: Support the Elbow

Support is critical for elbows to prevent sagging or stress on cables. Install supports according to NEMA VE 2 guidelines, typically near the elbow and at intervals along the tray span. Avoid placing connectors directly on the support; instead, position them between the support and the quarter-point of the span . Use strut, wall brackets, or ceiling hangers rated for the tray load.

Step 4: Fasten the Elbow

Secure the elbow to the tray using the recommended hardware. For metal trays, use carriage bolts, hex bolts, or self-tapping screws through the side rails or cover flanges. Ensure full contact between splice plates and tray sections and torque fasteners to the manufacturer's specifications (e.g., 3/8” bolts to 19 ft-lbs) to maintain structural integrity .

Step 5: Grounding and Bonding

Install a bonding jumper at the elbow if it is part of a continuous tray system. Ground the tray at intervals (typically every 15 m or 50 ft) and at both ends to maintain electrical continuity and safety . Use grounding bushings or compression lugs as needed.

Step 6: Verify Alignment and Clearance

After fastening, check that the elbow is level and aligned with the adjoining tray sections. Ensure there is sufficient clearance above and to the sides (minimum 300 mm or 12”) for cable installation and maintenance . Adjust supports if necessary to prevent stress on cables.

Step 7: Install Cables

Once the elbow is secured and aligned, lay the cables carefully through the elbow, maintaining proper bend radius and spacing. Use cable tray rollers for long runs to avoid kinks or damage . Following these steps ensures that cable tray entry elbows are installed safely, maintain structural integrity, and comply with electrical standards. Proper support, alignment, and grounding are essential for long-term reliability.