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Article Overview

A 90-degree cable tray elbow allows smooth directional changes in cable routing, available as fabricated bends or pre-manufactured fittings.

Fabricated 90-Degree Elbow

A fabricated or mitered 90-degree elbow is made by cutting and bending a straight cable tray section. The common method involves:

  • Marking the center line where the bend is desired.
  • Making two 45-degree cuts on the tray sides to form the elbow.
  • V-notching the base to allow the sides to close together.
  • Fastening the bent sections with nuts, bolts, and washers.
  • Applying cold galvanizing spray for rust protection if the tray is metallic. Tools required include a cutting tool (angle grinder or hacksaw), measuring tape, set square or protractor, drill, and fastening hardware . This method is often used when a custom radius or specific installation constraints exist.

Pre-Manufactured 90-Degree Elbows

Pre-manufactured elbows are available in horizontal and vertical configurations and come in various sizes and materials:

  • Horizontal elbows allow lateral turns in cable routing.
  • Vertical elbows enable upward or downward transitions, with standard radii of 12", 24", and 36" for different NEMA classes .
  • Materials include stainless steel (SS304) for washdown or corrosive environments .
  • Compatibility is specified by NEMA classes, side rail flange widths, and splice plate configurations .
  • Large radius elbows (e.g., 600mm) are available for high-capacity cable trays . Pre-manufactured elbows simplify installation, ensure consistent bend radius, and reduce labor compared to fabricated bends. Suppliers often offer bulk orders and fast shipping .

Selection Considerations

When choosing a 90-degree elbow:

  • Determine bend type (horizontal vs vertical).
  • Check tray width and NEMA class for compatibility.
  • Consider material and finish for environmental conditions.
  • Ensure radius is sufficient to prevent cable damage and maintain bend limits.
  • Decide between fabricated vs pre-manufactured based on installation complexity and availability.

Using the correct 90-degree elbow ensures efficient cable management, reduces stress on cables, and maintains system integrity.

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