90° Horizontal Elbow | Cable Tray Systems | PUPCO
The 90° Horizontal Elbow provides essential support and enables seamless cable management throughout
Dimensions of 90-degree elbows for cable trays
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 Radii
- 12 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 Classes
- Class 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 Construction
- Elbows 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.
Summary
When 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 .
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