Method for bending and fabricating cable trays

Cable tray bends can be fabricated using manual or machine-assisted methods, including cutting, bending, and reinforcing techniques to achieve 45°, 90°, or custom angles.Tools and MaterialsCommon tools and materials for fabricating cable tray bends include galvanized sheet metal (typically 1.6 mm thick), measuring tape, markers, angle grinders or metal shears, drills, rivets or bolts, bending tools (manual or hydraulic press brake), and optionally welding equipment .Fabrication Methods1. Simple BendsMarking: Identify the bend location and desired angle (commonly 45° or 90°). Divide the bend into equal segments to form a smooth curve .Cutting: Make triangular or rectangular cuts on the side walls to allow the tray to bend without deformation .Bending: Use a manual bender, press brake, or bending spring to gradually form the curve, ensuring uniformity .Reinforcement: Rejoin side cuts using welding or bolting with metal strips to maintain structural integrity . 2. Tee JunctionsMarking and Cutting: Mark the junction location on the main tray and cut an opening to fit the junction piece .Assembly: Insert the junction piece and secure it with appropriate fasteners, ensuring alignment and support. 3. Double BendsMarking: Identify the locations of the two bends on the tray .Bending: Form the first bend using a bending machine or spring, measure the distance to the second bend, and then create the second bend at the correct angle and spacing. 4. Saddle SetsMarking: Determine the four bend points required to navigate over obstacles .Bending: Sequentially bend each section using a bending machine or spring, measuring distances between bends to maintain accuracy.Specialized TechniquesIsosceles Triangle Method: For precise 90° bends, cut isosceles triangles on the tray sides to form two 45° bends that combine into a 90° elbow .Flat Bend Construction: Remove portions of the tray lip, cut along the centerline, flatten the lip at the bend point, bend to the desired angle, and bolt a gusset for reinforcement .SummaryFabricating bends in cable trays involves careful marking, cutting, bending, and reinforcement. Methods vary from simple manual bending to precise machine-assisted techniques, and the choice depends on the bend type, tray size, and installation requirements. Proper execution ensures smooth cable routing, structural integrity, and compliance with electrical installation standards .