Methods to prevent cable trays from swaying

Cable trays can be stabilized against swaying using seismic or sway bracing systems, including cable braces, trapeze supports, and pre-engineered attachment kits.

Understanding Anti-

Swaying in Cable TraysCable trays, especially in industrial or commercial installations, are prone to swaying due to vibrations, long unsupported spans, or seismic activity. Anti-swaying measures are essential to protect cables, maintain system integrity, and comply with safety standards. Proper bracing ensures that trays remain stable under dynamic loads and prevents damage to cable insulation.

Methods for Anti-Swaying1. Cable Bracing Systems Seismic cable bracing uses pre-stretched galvanized aircraft cables attached to structural elements or hanger rods. These systems allow both lateral and longitudinal stabilization and can be installed in confined spaces where rigid bracing is impractical.

Features include: Fast-attach yokes for quick installation on hanger rodsBreakaway hex nuts or swaged oval sleeves to ensure proper torqueStackable designs for multiple braces on a single rod 2. Trapeze Installations Trapeze supports involve suspending cable trays from threaded rods, often with predrilled tabs for direct attachment to concrete decks. Spacing of supports is typically recommended every 30 feet to minimize sway.

Cable braces can be connected directly to the rods using specialized fittings for added stability. 3. Wire Mesh and Ladder Trays Wire mesh trays, like Cablofil systems, provide lightweight yet strong support and can be easily adapted to complex routing.

Their open structure allows for fast installation of fittings and accessories, which can include sway bracing attachments. Ladder trays and perforated trays also benefit from strategically placed lateral braces to prevent movement.

Installation Considerations

Spacing and attachment points: Ensure braces are installed at recommended intervals and securely anchored to structural elements. Compliance: Use systems tested to meet ASCE 19 or equivalent seismic standards for mechanical and electrical installations. Retrofit capability: Many cable bracing kits allow for retrofit installations without disassembly of existing trays.

Material selection: Steel or stainless steel trays with corrosion-resistant coatings improve durability and maintain anti-swaying performance.

Recommended Products and Systems

Eaton TOLCO B-

Line series: Pre-engineered seismic cable kits for fast installation and verified torque.nVent CADDY: Steel cable assemblies with swaged oval sleeves for long spans and crowded spaces. Cablofil Wiremesh Trays: Lightweight, adaptable trays with predrilled tabs for sway bracing.

AB

B Cable Trays: Perforated, ladder, and channel trays suitable for medium to heavy-duty installations with anti-swaying options.

Key Takeaway

To prevent swaying in cable tray systems, combine proper tray selection with seismic or sway bracing, using cable braces, trapeze supports, or pre-engineered kits. Ensure installation follows recommended spacing, torque verification, and compliance with seismic standards to maintain safety, reliability, and longevity of the cable infrastructure.