Building-specific mesh cable trays

Mesh cable trays are constructed from electro-welded steel wires to form a ventilated, modular support system for routing and securing electrical cables.

Overview

Mesh cable trays, also known as wire mesh or basket trays, are designed to support, protect, and organize electrical cables in industrial, commercial, and infrastructure applications. They provide high load capacity, excellent ventilation, and flexibility for routing cables in multiple directions .

Materials and Finishes

• Steel or stainless steel is commonly used, with options for pre-galvanized, hot-dip galvanized, or stainless steel (AISI 316L) for corrosion resistance .
• Aluminum alloys may be used for lightweight applications with good corrosion resistance .
• Electro-welded wires form the tray mesh, ensuring rigidity and continuous ventilation for cables .
• Edges are often rolled or curled (Safe-T-Curl) to protect cables and installers during handling .

Components

A complete mesh cable tray system includes:

• Straight sections for linear cable runs
• Fittings: horizontal and vertical bends, tees, crosses, dropouts, and transitions
• Covers and inlays for protection and separation
• Clamps, brackets, supports, and hangers for secure mounting
• Splice plates and bars for connecting sections

Construction and Assembly

1. Tray Layout: Plan the route considering cable quantity, bends, and junctions.
2. Support Spacing: Install supports according to load requirements, typically on 8-foot spans for standard cables; heavier cables may require shorter spans .
3. Fittings Installation: Use engineered bends and junctions to maintain cable integrity and minimize stress. Horizontal bends should be installed before cable placement to avoid deflection .
4. Section Connection: Connect straight sections using splice plates or couplers, positioning couplers at approximately 1/5th of the span for optimal load performance .
5. Mounting: Secure trays to ceilings, walls, or floors using brackets, hangers, or supports. Ensure proper alignment and level to prevent sagging .
6. Cable Placement: Feed cables into the tray, ensuring separation and avoiding sharp bends. Mesh design allows easy insertion and exit in multiple directions .

Design Considerations

• Load Capacity: Determine based on cable type, quantity, and span length.
• Ventilation: Mesh design allows heat dissipation and prevents moisture accumulation.
• Corrosion Protection: Select material and finish according to environmental conditions.
• Flexibility: Mesh trays can be bent or cut on-site to create custom routes and branches .

Standards and Safety

• Follow DIN EN 61537 or equivalent standards for cable support systems .
• Ensure trays are not used as walkways and are installed to prevent mechanical damage to cables .
• Maintain proper grounding and bonding as required by electrical codes. Mesh cable trays offer a modular, durable, and versatile solution for cable management, combining structural strength with ease of installation and adaptability to complex routing requirements.