Parallel S-degree elbows for cable trays are fabricated by segmenting the bend into multiple angled sections, using precise bending techniques and appropriate materials to maintain structural integrity and compliance with standards.

Understanding S-Degree Elbows

An S-degree elbow is a cable tray fitting that allows a smooth, parallel offset in the tray run, typically used to navigate around obstacles while maintaining cable alignment. Unlike a single 90° or 45° elbow, an S-degree elbow is composed of two or more angled segments that create a continuous offset without sharp bends, reducing stress on cables and maintaining minimum bend radius requirements .

Materials and Standards

Cable trays can be fabricated from steel, stainless steel, or aluminum, depending on environmental conditions and load requirements. Stainless steel (e.g., AISI 316L) is preferred in corrosive environments, while aluminum offers lightweight and corrosion-resistant properties . All materials should comply with NEMA or CE standards for mechanical strength, electrical safety, and corrosion resistance .

Fabrication Process

1. Segment Calculation: Determine the number of segments required. For example, a 45° elbow may require two segments, while a 90° elbow may require three segments. An S-degree elbow typically combines two opposing bends, each subdivided into smaller angles to achieve a smooth offset .
2. Cutting and Preparation: Cut the tray sections to the required lengths. Ensure edges are deburred and surfaces are clean to facilitate bending and welding.
3. Bending: Use a press brake or specialized bending tools to form each segment at the calculated angle. Maintain the minimum bend radius to prevent cable damage and ensure compliance with installation standards .
4. Assembly and Welding: Align the segments to form the S-shape. Weld or mechanically fasten the joints, ensuring structural integrity and smooth internal surfaces to avoid cable abrasion .
5. Finishing and Quality Control: Inspect the elbow for dimensional accuracy, smoothness, and compliance with standards. Apply protective coatings if required (e.g., galvanization for steel trays) to enhance corrosion resistance .

Installation Considerations

• Maintain minimum bend radius for cables to prevent insulation damage.
• Ensure the elbow aligns with the main tray run to avoid misalignment.
• Use covers or ventilated designs as needed for environmental protection and heat dissipation . By following these steps, parallel S-degree elbows can be fabricated efficiently, ensuring both mechanical strength and safe cable management in electrical installations.