One side of the horizontal bend in the cable tray

One side of a horizontal bend in a cable tray is typically formed by either a factory-made bend or a field-modified section, with proper support and alignment to ensure smooth cable routing. Factory vs.

Field-

Made Bends

Factory bends are pre-formed at specific angles (commonly 30°, 45°, 60°, or 90°) and are pre-drilled to accept splice plate fasteners, ensuring structural integrity and smooth cable pulling ( ). These bends are compact and maintain the tray's radius, which helps prevent cable damage during installation. Field-made bends involve cutting and mitering straight tray sections to achieve the desired angle.

For ladder or wire mesh trays, installers may cut side wires or rungs and bend splice brackets to match the required angle ( ). Field bends are often used when the required angle is not available from the manufacturer, such as small incremental bends (e.g., 10°) around obstacles.

Support and Installation Considerations

Support spacing: NEMA standards recommend supporting the radius at the center and within 2 feet of each end where the bend connects to straight sections ( ). For minor mitered angles, support may be treated as a standard splice between straight sections. Alignment: Ensure the two tray sections are aligned properly using universal splices or clamps.

For wire mesh trays, side wires may need to be cut back to the first complete grid to form the bend ( ). Protection: For wire mesh trays, cut ends can be protected with rubber caps to prevent cable damage ( ).

Material-

Specific Notes

Fiberglass trays: Adjustable horizontal bends allow flexibility in the field and are pre-drilled for splice plates. Smooth curved rails aid cable pulling ( ). Aluminum or steel trays: Standard horizontal bends (e.g., 45°) are available and can be connected using splice plates or clamps ( ).

Practical Tip

When creating one side of a horizontal bend, always ensure the bend radius is smooth enough to prevent cable stress, and that the bend is properly supported according to the tray type and angle. Factory bends are preferred for sharper angles, while field modifications are suitable for minor adjustments or custom routing around obstacles.