How high is the side of the cable tray
Cable tray side heights typically range from 65 mm to 150 mm depending on load requirements and NEMA class.
Standard Side Heights
Cable tray side height, also referred to as the side rail height, is a critical dimension that affects the tray's structural strength and load-bearing capacity. According to NEMA standards:
- Shallow side rail: 65 mm (NEMA 1) – suitable for light loads
- Intermediate side rail: 93.5 mm (NEMA 2) – for moderate loads
- High side rail: 131 mm (NEMA 3) – for heavier loads
- Tallest side rail: 150 mm (NEMA 4) – for extra heavy-duty applications
The overall width of a cable tray is calculated as the internal width plus twice the side rail height, which ensures proper accommodation of cables while maintaining structural integrity .
Factors Affecting Side Height Selection
- Load Capacity: Taller side rails provide greater strength and can support heavier cable bundles or longer spans between supports .
- Cable Type and Size: Large power cables or multiple layers of instrumentation cables may require higher side rails to prevent sagging and maintain proper bending radii .
- Installation Environment: Outdoor or industrial installations with environmental loads (wind, snow, ice) may necessitate taller side rails for added rigidity .
- Span Between Supports: Longer spans require higher side rails to reduce deflection and maintain safety standards .
Practical Considerations
- Standard NEMA cable trays are available in internal widths of 150 mm to 600 mm and lengths of 3 m or 6 m, with side height chosen according to load and span requirements .
- Ladder-type trays often use 16-gauge steel tubing for rails, and side height contributes to the tray's ability to provide mechanical support and strain relief for cables .
- When designing a system, engineers should consider side height in conjunction with rung spacing, tray width, and material strength to ensure safe and reliable cable management .
Selecting the correct side height is essential for both structural integrity and cable protection, making it a key parameter in cable tray system design.
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