Dimensions of 45° elbows for horizontal cable trays
45° horizontal elbows for cable trays typically feature side rail widths of 1 1/8", 2", or 2 3/8" depending on NEMA class, with standard bend radii of 75 mm, 150 mm, or 300 mm.
Side Rail Widths by NEMA Class
- Class 1 (NEMA 12B, 12C): 1 1/8" wide side rail flanges with 4-hole splice plates .
- Class 2 (NEMA 20A, 20B, 20C): 2" wide side rail flanges with 4-hole splice plates .
- Class 3 (NEMA >20C): 2 3/8" wide side rail flanges with 8-hole splice plates . These widths ensure proper support and secure connections for the corresponding cable tray systems.
Bend Radii
- Standard diagonal corner radius: 75 mm .
- Custom request radii: 150 mm or 300 mm for diagonal or curve corners . The radius affects the smoothness of cable transitions and the space required for installation, with larger radii providing gentler bends for larger cables or higher fill capacities.
Additional Design Features
- Many elbows, such as the ITray aluminum I-beam design, include structural offsets in the sidewall for strong mid-span splices, reducing the number of supports needed and simplifying installation .
- Zero tangent fittings are available to minimize wasted space in tightly packed areas, allowing more tray runs and better heat distribution .
Summary
When selecting a 45° horizontal elbow for a cable tray system, consider:
- NEMA class compatibility to match side rail width and splice plate configuration.
- Bend radius to accommodate cable size and installation space.
- Material and design features for structural strength and ease of installation. These dimensions and features ensure a secure, efficient, and code-compliant cable tray installation.
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