Prefabricated cable tray elbows are used to change the direction of cable runs safely and efficiently, and must be properly supported, aligned, and bonded to maintain system integrity.

Types of Cable Tray Elbows

• 45° Elbow: Typically made from two segments to create a gentle directional change .
• 90° Elbow: Usually consists of three segments to form a right-angle turn .
• Elbows can be horizontal or vertical, depending on whether the cable run changes direction along the same plane or between floors.

Installation Steps

1. Plan the Layout: Determine the path of the cable tray and identify where elbows are required to navigate corners or obstacles .
2. Position Supports: Install supports according to manufacturer guidelines and standards such as NEMA VE 2. Supports should be placed so that connectors between straight sections and elbows are not at the center of spans but between the support point and the quarter-point of the span .
3. Attach the Elbow: Connect the prefabricated elbow to the straight tray sections using the provided connectors or bolts. Ensure proper alignment to avoid stress on cables .
4. Maintain Bend Radius: Ensure that the minimum bend radius for cables is respected to prevent damage, especially for sensitive instrumentation or control cables .
5. Secure Cables: Lay cables neatly within the tray, maintaining spacing and avoiding overcrowding. Use cable ties or separators if necessary .
6. Bonding and Grounding: Install bonding jumpers at each elbow and expansion joint to maintain electrical continuity. Ground the tray at both ends and at intervals of approximately 15 meters (50 ft), .

Practical Tips

• Check Manufacturer Instructions: Always follow the specific installation instructions provided by the cable tray manufacturer for the type of elbow being used .
• Use Quality Supports: Center-hung or side-hung supports can facilitate easier cable installation and reduce stress on elbows .
• Verify Alignment: Misaligned elbows can cause cable strain and reduce system reliability.
• Consider Material and Environment: Aluminum elbows are corrosion-resistant and suitable for many environments, while steel or coated trays may be required for heavy-duty or outdoor applications . By following these steps and guidelines, prefabricated cable tray elbows can be installed safely, ensuring proper cable management, system reliability, and compliance with electrical codes.