ZITHA SPECIALTYSPECIALTY FIBER CABLES Technical Inquiry

Anti-sway support for cable trays

Yes, cable trays require anti-sway supports to maintain stability, prevent lateral movement, and ensure safe cable management, especially for long or elevated spans.Importance of Anti-Sway Supports

Cable trays are designed to support electrical cables in commercial, industrial, and utility installations. While vertical and horizontal support prevents sagging, anti-sway supports are essential to resist lateral forces caused by wind, seismic activity, or mechanical vibrations. Without these supports, trays can shift, leading to cable damage, misalignment, or even structural failure, which can compromise electrical system reliability and safety .

Support Span Guidelines

The spacing of supports depends on the tray type and span length:

  • Short-span trays (typically indoor, non-industrial) are supported every 6 to 8 feet.
  • Intermediate-span trays are supported every 10 to 12 feet.
  • Long-span trays may require supports every 14 to 20 feet, with extra-long spans exceeding 20 feet, especially for outdoor installations . Anti-sway supports are particularly critical for long and extra-long spans, where lateral movement is more likely due to the increased leverage and weight of the cables.
Standards and Best Practices
  • IEC 61537 specifies mechanical performance requirements for cable trays, including deflection and yield strength under load. Anti-sway supports help meet these standards by stabilizing trays against lateral forces .
  • NEMA BI 50015 and BI 50016 define support locations and recommend the “1/4 span” method to minimize stress and deflection at splice points .
  • Anti-sway supports can include lateral bracing, cross members, or rigid hangers attached to the building structure to prevent tray movement.
Practical Considerations
  • Ensure that the tray length matches the support span to control splice locations and reduce stress.
  • Use heavy-duty expansion splice plates and adjustable fittings in combination with anti-sway supports for long runs.
  • Outdoor or elevated installations may require additional bracing to withstand wind or seismic loads . In summary, anti-sway supports are a critical component of cable tray systems, ensuring mechanical stability, compliance with standards, and long-term reliability of electrical installations. Proper design and placement of these supports prevent lateral movement, protect cables, and reduce maintenance costs.
Anti-sway support for cable trays

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PLP Anti-Sway Brackets secure the bottom of cable spacers at tangent poles to prevent sway/swinging movement of the bundle.

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