Lateral cable tray seismic bracing models

Lateral cable tray seismic bracing is achieved using pre-approved systems such as Eaton's TOLCO/B-Line series and Loos & Co. Wire Rope/Cable™ bracing, designed to meet building codes and facilitate rapid installation.

Overview of Lateral Bracing Systems

TOLCO/B-Line Series Cable Bracing Eaton's B-Line series with TOLCO seismic bracing provides a complete solution for lateral and longitudinal bracing of cable trays. These systems use 7 x 19 strand core pre-stretched galvanized aircraft cable and are designed to attach to hanger rods or structural attachments. The unique “Fast-Attach” yoke and breakaway hex nuts ensure proper torque and installation. The system allows stackable installation of lateral, longitudinal, and opposing braces on a single hanger rod without disassembly, making it suitable for both new construction and retrofit projects. Pre-approved assembly drawings and engineering services, including PE stamps, are available for compliance with IBC, CBC, and OSHPD standards . Wire Rope/Cable™ Bracing (Loos & Co.) Loos & Co. offers Wire Rope/Cable™ seismic bracing, which is pre-stretched to act elastically, effectively dampening seismic loads. These braces are UL listed, flexible, and lightweight, with no length limitations, and are designed to resist earthquake loads in tension. Standard braces come in color-coded sizes with minimum breaking strengths ranging from 900 to 6600 lbs. The system includes a wire rope, factory-attached stake eye, oval sleeve, and universal restraint clip (URC) for secure installation .

Design Considerations

• Seismic Code Compliance: Bracing must meet local building codes (IBC, CBC) and nonstructural component requirements, such as those outlined in the Uniform Building Code (UBC) Zone 3 for high seismicity areas .
• Attachment Points: Lateral braces are typically attached to hanger rods, structural attachments, or the cable tray itself, avoiding reliance on exterior walls or roofs.
• Cable Tray Configuration: Ladder-type or solid-bottom trays with bolted splices are commonly used. Diagonal bracing may be applied between layers for longitudinal and lateral stability .
• Installation Efficiency: Pre-approved kits and fast-attach designs can reduce installation time by up to 50% compared to traditional methods .

Practical Applications

• Telecommunications Facilities: Lateral bracing is critical above equipment cabinets to prevent tray displacement during seismic events.
• Retrofit Projects: Stackable and modular designs allow easy integration into existing systems without major disassembly.
• Vibration Isolation: Cable bracing can be combined with vibration isolation systems for sensitive equipment. By selecting a pre-approved seismic bracing model and following manufacturer guidelines, engineers can ensure that lateral cable tray systems remain secure during seismic events while meeting code requirements and minimizing installation time .