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Construction of Brazilian Trough Cable Trays

Construction of Brazilian Trough Cable Trays

Brazilian trough cable trays are ventilated or solid-bottom support systems designed to safely route and protect electrical, control, and communication cables in industrial and commercial facilities.OverviewA trough cable tray is a deep, solid or ventilated enclosure that supports cables while allowing for airflow, dust drainage, and easy maintenance . In Brazil, these trays are commonly used in industrial facilities where large bundles of power, control, or instrumentation cables need structured support. Trough trays can be fabricated from steel, stainless steel, aluminum, or fiberglass, depending on environmental conditions and corrosion resistance requirements .Materials and Corrosion ResistanceSteel: Pre-galvanized or hot-dip galvanized for general industrial use; provides high mechanical strength .Stainless Steel (AISI 316L): Offers superior corrosion resistance, especially in chemical or coastal environments .Aluminum: Lightweight, corrosion-resistant, and suitable for long spans; often used in areas with moderate environmental exposure .Fiberglass (FRP): Pultruded polyester or vinyl ester trays provide high resistance to chemical corrosion and are non-conductive .Structural DesignBrazilian trough cable trays typically feature:Side rails: Solid or ventilated, providing structural support and protection.Rungs or crossbars: Support cables at regular intervals, similar to ladder trays, but enclosed within the trough for added protection .Ventilation slots: Optional, to allow airflow and prevent heat buildup while minimizing dust accumulation .Covers: Solid or peaked covers can be added to protect cables from debris, dust, or water ingress .Installation GuidelinesSupport Spacing: Trough trays are supported at intervals ranging from 12 to 30 feet, depending on material and load .Orientation: Trays can be installed horizontally or edge-wise (vertical rungs) if manufacturer guidelines allow, which can reduce dust accumulation in certain environments .Load Considerations: Ensure the tray is rated for the total cable weight, including future expansion. Ladder-style rungs within the trough help distribute weight evenly .Bends and Fittings: Use radius bends and junctions to maintain cable integrity and prevent sharp bends that could damage insulation .Grounding and Bonding: Metal trays must be properly grounded according to local electrical codes to ensure safety .Environmental Protection: Select materials and finishes based on exposure to moisture, chemicals, or temperature extremes .Standards and ComplianceNEMA VE1 and VE2: Provide guidelines for metal cable tray systems, including troughs .NEMA FG1: Covers fiberglass cable tray standards .National Electrical Code (NEC): Defines cable tray as a rigid structural system for supporting cables and raceways, ensuring safe installation .Manufacturer Specifications: Always follow the specific installation instructions provided by the tray manufacturer to maintain warranty and compliance .AdvantagesEase of Installation: Cables can be laid in bundles without pulling through conduits.Maintenance and Expansion: New cables can be added easily.Protection: Solid or ventilated troughs protect cables from mechanical damage, dust, and water.Heat Dissipation: Ventilated designs allow airflow to prevent overheating of power cables . Brazilian trough cable trays provide a versatile, durable, and code-compliant solution for industrial cable management, combining structural strength, environmental protection, and ease of maintenance. Proper material selection, support spacing, and adherence to standards ensure long-term performance and safety.

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