Dimensioning of 90-degree cable tray elbows
90-degree cable tray elbows come in various standard radii and side rail widths, typically ranging from 75 mm to 600 mm radius and 1 1/8" to 2 3/8" side rail widths depending on NEMA class and tray type.
Standard Radii
- Small to standard elbows: 75 mm, 150 mm, 300 mm (diagonal or curve corners) for compact installations .
- Medium to large elbows: 12", 24", 36" radius (approximately 300 mm, 600 mm, 900 mm) for horizontal routing .
- Extra-large elbows: 600 mm radius for heavy-duty or large cable trays .
Side Rail Widths and Classes
- Class 1: 1 1/8" wide side rail flanges, 4-hole splice plates, compatible with NEMA Classes 12B and 12C .
- Class 2: 2" wide side rail flanges, 4-hole splice plates, compatible with NEMA Classes 20A, 20B, 20C .
- Class 3: 2 3/8" wide side rail flanges, 8-hole splice plates, for NEMA Classes exceeding 20C .
- Class 4: 2 3/4" wide side rail flanges, 8-hole heavy-duty splice plates, for 8" high cable tray systems .
Edge Heights and Tray Widths
- Common edge heights: 85 mm for steel elbows .
- Tray widths: 102 mm, 202 mm, 302 mm, 402 mm, 502 mm, 602 mm, depending on cable load and installation requirements .
Material and Finish
- Steel elbows: Pre-galvanized or hot-dip galvanized according to DIN EN 10346 or DIN EN ISO 1461 .
- GRP elbows: Glass fiber reinforced polyester, often with integrated perforated connector plates, suitable for corrosive environments .
Summary
When selecting a 90-degree cable tray elbow, consider:
- Radius: Small (75–150 mm) for tight spaces, large (300–600 mm) for smooth cable bends.
- Side rail width: Matches NEMA class of the tray.
- Edge height and tray width: Ensures proper cable support.
- Material: Steel for general use, GRP for corrosion resistance. These dimensions ensure proper cable management, minimize stress on cables, and maintain compliance with NEMA standards.
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