What are the dimensions of a 90° elbow in a cable tray

90° elbows for cable trays typically come with standard radii of 12", 24", or 36", with side rail widths and splice plate configurations varying by NEMA class.Standard Radii12 inches, 24 inches, and 36 inches are the most common radii for horizontal 90° elbows, allowing smooth cable routing around corners .Some manufacturers also offer custom radii upon request, such as 75 mm, 150 mm, or 300 mm for smaller or specialized installations .Side Rail Widths and NEMA ClassesClass 1: Compatible with NEMA 12B and 12C cable trays; side rail width 1-1/8", 4-hole splice plates .Class 2: Compatible with NEMA 20A, 20B, and 20C; side rail width 2", 4-hole splice plates .Class 3: For NEMA classes exceeding 20C; side rail width 2 3/8", 8-hole splice plates .Class 4: For heavy-duty trays (e.g., 8" high A820E system); side rail width 2 3/4", 8-hole heavy-duty splice plates .Material and ConstructionElbows are available in ladder, I-beam, or solid tray designs.Some elbows are made from glass fiber reinforced polyester (GRP) with molded connectors for small systems .Compatibility with the cable tray system must be verified based on tray type, height, and load requirements.SummaryWhen selecting a 90° elbow for a cable tray system, consider:Radius: 12", 24", 36" (or custom) for smooth cable bends.Side rail width and splice plate: Match the NEMA class of your tray.Material and type: Ladder, I-beam, or GRP depending on load and environment.Compatibility: Ensure the elbow fits the tray height and width for proper installation.These dimensions ensure proper cable management, reduce stress on cables, and maintain system integrity during installation and operation .