Size of longitudinal seismic bracing for cable trays
For rigid cable trays, longitudinal seismic braces should be spaced no more than 24 meters apart, while flexible trays require roughly half that spacing.
General Guidelines
Longitudinal seismic braces are critical for maintaining the stability of cable trays during seismic events. For rigid cable trays, the maximum spacing between longitudinal supports is 24 meters, whereas for flexible cable trays, the spacing is typically 12 meters to account for increased flexibility and potential movement under seismic loads . These spacings ensure that the cable tray system remains supported along its entire length, minimizing the risk of structural failure.
Lateral Bracing Considerations
Lateral supports are equally important and must be installed at both ends of the cable tray. If the distance between longitudinal supports exceeds the maximum allowable spacing, additional supports should be added at midpoints. Lateral supports should also be positioned within 0.6 meters of any turning points in horizontal runs to enhance stability .
Special Configurations
Implementing gate-type seismic braces is recommended for enhanced support. These braces should include at least one lateral support or two longitudinal supports to ensure proper load distribution during an earthquake . The angle of braces is typically designed between 30° and 60° from horizontal to optimize load resistance .
Engineering Principles
The exact spacing may vary depending on factors such as seismic intensity, cable tray weight, tray type, and local building codes. All designs should be verified by a licensed structural or electrical engineer to ensure compliance with standards such as ASCE 7-22, NFPA, and SMACNA guidelines . Proper layout and secure anchorage to structural members are essential to prevent non-structural damage and maintain system reliability during seismic events. By following these guidelines, cable tray systems can achieve adequate seismic resilience, protecting both the electrical infrastructure and building occupants.
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