Installation method of cable tray elbow tee

Proper installation of cable tray tees and elbows requires correct support, alignment, and secure fastening to ensure safe cable routing and compliance with standards.

Planning and Preparation

Before installing tees and elbows, plan the cable tray route carefully, considering clearance, load capacity, and cable separation requirements. Identify locations where the main tray will branch or change direction, and select the appropriate tee or elbow fitting based on the tray type and width (100–600 mm) and side height (35–110 mm) ( ).

Support and Alignment

• Support spacing is critical: place supports so that connectors between straight sections fall between the support point and the quarter-point of the span. Avoid placing connectors at the center of spans or directly on supports ( ).
• Elbows and tees must be supported according to NEMA VE 2 standards, ensuring the weight of cables does not cause sagging or misalignment ( ).
• Use mounting brackets, clamps, or truss-head bolts to secure fittings to the tray rails. Some fittings, like vertical bends or adjustable bends, may require specific fastening methods ( ).

Installation Procedure

1. Attach the fitting to the main tray using the recommended connectors or clamps. Ensure joint plates are properly aligned and, if provided, pre-mounted turn buckles are engaged ( ).
2. Check alignment: the tee or elbow should be level and in line with the tray run to prevent cable stress.
3. Secure supports: install additional supports under the fitting if necessary, especially for long runs or heavy cable loads ( ).
4. Bonding and grounding: install bonding jumpers at expansion joints and at both ends of the tray system. Ground all conduit drop-outs to maintain electrical continuity ( ).

Cable Handling

• Lay cables neatly within the tray, maintaining proper spacing and avoiding sharp bends that exceed the minimum bend radius ( ).
• Use cable ties or straps to organize cables by voltage or function, leaving slack for expansion or future adjustments ( ).
• For long runs, consider using cable tray rollers to prevent kinks when routing through elbows or tees ( ).

Additional Considerations

• Ensure the selected tray material and finish is suitable for the environment (indoor, outdoor, corrosive conditions) ( ).
• Verify that all fittings, including tees and elbows, are compatible with the tray type (perforated, solid-bottom, ladder) and width ( ).
• Follow manufacturer instructions and local electrical codes (NEC, NEMA VE 2) for installation compliance ( ). By following these guidelines, cable tray tees and elbows can be installed safely, maintaining structural integrity, proper cable support, and compliance with electrical standards.