Specifications and Models of Metal Cable Tray Elbows

Metal cable tray elbows are available in various types, materials, and sizes to accommodate directional changes in cable tray systems, with specifications governed by NEMA VE 1, NFPA 70, and ASTM standards.

Types of Cable Tray Elbows

1. Horizontal Elbows – Used to change the direction of a cable tray in the horizontal plane. Available in ladder and solid bottom designs, with rail heights typically ranging from 4" to 7" and widths from 6" to 36". Radii for horizontal elbows range from 12" to 36" depending on the tray type and application (Legrand) .
2. Vertical Elbows (Inside/Outside) – Allow the tray to change elevation, either ascending or descending. These are essential for routing around obstacles or connecting different levels of a facility (King Power Technology) .
3. Specialty Elbows – Include adjustable or multi-angle elbows for complex routing, often used in industrial or high-density installations.

Materials and Finishes

• Galvanized Steel – Hot-dip or electro-galvanized for corrosion resistance, commonly used in industrial and outdoor applications (Eaton, ABB) .
• Aluminum – Lightweight, corrosion-resistant, and suitable for environments requiring reduced weight or non-magnetic properties (Legrand) .
• Stainless Steel – Used in highly corrosive environments or where hygiene is critical, such as food processing or chemical plants (Eaton) .

Standards and Compliance

• NEMA VE 1 – Defines metallic cable tray systems, including ladder and solid bottom types, and their fittings .
• NFPA 70 (NEC) – Governs installation and safety requirements for cable tray systems .
• ASTM Standards – Include A123, A653, A1011, A1008, and B633 for steel and zinc coatings, ensuring structural integrity and corrosion protection .

Dimensions and Models

• Rail Heights – Typically 4", 5", 6", and 7" for aluminum trays; 50mm, 70mm, 100mm, 120mm for steel trays (King Power Technology, Legrand) .
• Widths – Range from 6" to 36" for aluminum trays; steel trays may vary according to series and duty rating (Eaton Series 2–5, KwikRail) .
• Radii – Horizontal elbows: 12"–36"; vertical elbows: customized based on installation requirements .
• Models – Manufacturers provide part numbers that encode tray type, size, material, and finish for easy specification and ordering (Legrand) .

Installation Considerations

• Elbows must match the width and type of the straight tray sections.
• Field verification of dimensions and routing is required to ensure proper fit and compliance with design drawings .
• Accessories such as splice plates, bolts, and joint connectors are used to assemble elbows with straight sections securely .

Summary

Metal cable tray elbows are critical components for routing cables efficiently and safely. Selection depends on tray type (ladder, solid bottom), material (galvanized steel, aluminum, stainless steel), dimensions (height, width, radius), and compliance with NEMA and NFPA standards. Manufacturers like Eaton, ABB, and Legrand provide detailed catalogs and part numbers to simplify specification and installation .