Ladder trays are often preferred for primary distribution in high-seismic areas due to their structural stiffness and efficient weight-to-strength ratio, making them suitable for heavy cable loads and long spans . Perforated or trough trays can also be used but require careful evaluation of mass, support spacing, and cable retention . Wire mesh or basket trays may be acceptable in some installations, but their splice and support details must be carefully reviewed for seismic movement . Channel trays are generally reserved for light-duty runs and are less suitable for major seismic distribution routes .
Seismic bracing is essential for cable trays supporting critical systems, such as:
Seismic bracing can be cable bracing (tension-only, requiring two opposing braces per location) or rigid bracing (resists both tension and compression, requiring one brace per location, with limitations based on drop length), . Proper bracing design must account for lateral, longitudinal, and uplift forces, as well as differential movement across seismic joints .
Cable trays requiring seismic bracing should comply with relevant codes and standards, including:
Seismic bracing is required for:
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Kit contains items needed for seismic bracing long cable tray runs. Each kit contains: (4) 11'' cables with mounting eyelets (2) Metal
In our three-part blog series, we''ll be exploring the different seismic bracing attachments,
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SOLID-BOTTOM CABLE TRAY Providing additional cable protection, solid-bottom cable tray is sometimes preferred to support and
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