Metal cable tray support content per meter
Metal cable trays typically require supports spaced between 1.5 to 3 meters, depending on tray type, load, and installation standards.
Support Spacing Guidelines
The number of supports per meter for a metal cable tray depends on the tray type, material, and load. For standard steel or aluminum trays installed indoors, supports are commonly spaced every 2 meters, which translates to 0.5 supports per meter . Heavier loads, longer spans, or outdoor installations may require closer spacing, typically 1.5 meters, increasing the support density to about 0.67 supports per meter .
Calculation Method
To calculate the total number of supports for a straight tray section: Support Quantity = (Total Tray Length ÷ Support Spacing) + 1 For example, a 20-meter tray with 2-meter spacing requires: 20 ÷ 2 + 1 = 11 supports . This formula ensures that both ends of the tray are supported and that the load is evenly distributed.
Factors Affecting Support Requirements
- Tray Type: Ladder, perforated, or solid-bottom trays have different load capacities and stiffness, affecting support spacing .
- Load: The total weight of cables and accessories determines the required support density. Heavier loads require closer supports .
- Environmental Conditions: Outdoor, corrosive, or high-temperature environments may necessitate additional supports or specialized brackets .
- Junctions and Bends: Elbows, tees, and crossovers require extra supports near directional changes to maintain stability .
Standards and Compliance
The IEC 61537 standard provides guidelines for metal cable tray systems, including support spacing, load testing, and deflection limits . Compliance ensures safety, structural integrity, and compatibility across installations. Manufacturers often provide tested span tables for their trays, which should be followed for precise support planning.
Practical Recommendation
For typical indoor steel cable trays:
- Support spacing: 2 meters (0.5 supports per meter)
- Heavy-duty or outdoor trays: 1.5 meters (0.67 supports per meter)
- Elbows/tees: Add supports at each junction This approach balances safety, cost, and installation efficiency while adhering to international standards .
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