INSTALLATION GUIDE
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Correct Method for Using Cable Tray Reducing Elbows
Cable tray elbows change the direction of cable runs, while reducing elbows also adjust the tray width to accommodate different cable volumes.
Cable Tray Elbows
Cable tray elbows are fittings used to change the direction of a cable tray system. They are essential for navigating corners, obstacles, or changes in elevation within a building. Elbows are available in several standard angles:
- 30-degree elbows: For gentle, shallow turns around building features .
- 45-degree elbows: For medium-sharp turns, commonly used for corners that are not perfectly square .
- 90-degree elbows: For sharp, right-angle turns, such as at wall junctions . Elbows can also be classified by plane:
- Horizontal elbows: Change the direction on the same level, keeping the tray flat .
- Vertical elbows: Adjust the height of the cable run, either rising or dropping to a different level . Adjustable elbows are available for custom angles, providing flexibility when standard angles do not fit the installation space .
Reducing Elbows
Reducing elbows combine the directional change of a standard elbow with a change in tray width. They are used when the cable volume decreases along the run, requiring a narrower tray. This ensures a smooth transition between different tray sizes, maintaining cable safety and organization .
Materials and Construction
Cable tray elbows and reducing elbows are typically made from:
- Galvanized steel: Offers durability and corrosion resistance .
- Stainless steel: Suitable for harsh or corrosive environments .
- Aluminum alloy: Lightweight and corrosion-resistant, ideal for industrial or outdoor applications .
- Fiberglass-reinforced plastic (FRP): Provides chemical resistance and electrical insulation .
Additional Considerations
- Radius of the elbow: Important to prevent cable damage and maintain proper bend radius .
- Compatibility: Ensure elbows match the tray type and class (e.g., NEMA Class 12B, 20A) for proper installation .
- Accessories: Covers, cleats, and dividers can be used with elbows to protect and organize cables . Using the correct elbow or reducing elbow ensures efficient cable routing, safety, and a tidy installation, especially in complex layouts with multiple direction changes or varying cable volumes.
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