How to construct an S-bend in a cable tray

An S-bend in a cable tray is created by sequentially bending the tray in opposite directions, either using a bending machine, crimping tools, or manual methods, to smoothly route cables around obstacles or change elevation. Steps to Create an S-BendPlan the Bend Determine the required vertical and horizontal offsets for the S-bend. Measure the distance and angles needed to ensure the tray aligns with the intended cable path without sharp kinks, which could damage cables.

Mark the Bend Points Use a marker to indicate where the tray will bend. For an S-bend, you will have two opposite bends: the first to start the offset and the second to return the tray to its original alignment.

Choose the Bending Method

Cable Tray Bending Machine: Ideal for steel or aluminum trays, this machine allows precise bends without deforming the tray. Manual Crimping or Metal Bar: For on-site adjustments, a crimping tool or a sturdy metal bar can be used to create bends by lifting and pressing the tray at the marked points. Pre-fabricated Fittings: Some manufacturers offer S-bend or offset fittings that can be bolted to the tray, reducing manual bending effort.

Perform the First Bend Apply force gradually to bend the tray at the first mark. Ensure the bend is smooth and does not pinch or distort the tray, which could interfere with cable installation. Perform the Second Bend Bend the tray in the opposite direction at the second mark to complete the S-shape.

Check that the tray maintains proper alignment and clearance for cables. Check and Adjust After bending, verify that the tray is level and the S-bend provides sufficient space for cables. Make minor adjustments as needed to prevent stress points.

Additional Considerations

Material: Steel trays are more rigid and may require mechanical assistance, while aluminum or wire mesh trays are easier to bend manually. Safety: Wear gloves and eye protection when bending metal trays to avoid injury. Cable Protection: Ensure edges are smooth or capped to prevent cable damage.

Rubber caps or protective strips can be used on cut or bent edges. Compliance: Follow local electrical codes and manufacturer guidelines to maintain structural integrity and safety. By following these steps, an S-bend can be effectively created on-site, allowing cables to navigate around obstacles or change elevation while maintaining proper support and protection.