Dimensions for right-angle cable tray fabrication

Right-angle (90°) cable tray fittings are available in standard widths from 150 mm to 900 mm, with heights ranging from 66 mm to 203 mm, and bend radii typically from 305 mm to 1220 mm depending on tray type.Standard Widths and HeightsRight-angle cable trays are designed to match the widths of straight tray sections to ensure seamless cable routing. Common nominal widths include 150 mm, 203 mm, 300 mm, 450 mm, 600 mm, 750 mm, and 900 mm. Heights (side rail or tray depth) vary by material and load requirements, typically ranging from 66 mm to 203 mm for aluminum trays, with steel trays sometimes offering slightly higher depths for heavy-duty applications .Bend Radii and AnglesRight-angle elbows are manufactured to allow smooth 90° turns without damaging cables. Standard bend radii are 305 mm, 610 mm, 915 mm, and 1220 mm, and elbows are available in 30°, 45°, 60°, and 90° increments . The perpendicular distance for a 90° bend is measured from the inside of one side member to the opposite side member, ensuring proper cable clearance and fill compliance.Material ThicknessMaterial thickness affects load capacity and structural integrity. For steel trays, thickness typically ranges from 1.0 mm for widths up to 300 mm to thicker gauges for wider trays. Aluminum trays generally start at 90 mm height with 3.5" to 8" side rails, depending on the load and span .Installation ConsiderationsMaintain a normal spacing of 225 mm through the middle of the fitting for proper support .Ensure elbows match the width and height of the straight tray sections to prevent cable congestion.Include 25% spare capacity for future cable expansion when selecting tray size .SummaryFor a typical right-angle cable tray installation:Widths: 150–900 mmHeights: 66–203 mmBend radii: 305–1220 mmAngles: 90° standard, with optional 30°, 45°, 60°Material thickness: 1.0 mm and above depending on width and load These dimensions ensure compatibility with straight sections, proper cable fill, and compliance with NEC and IEC standards .