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Composition and Structure of Steel Cable Trays

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Steel cable trays consist of side rails, rungs, tray bases, and fittings, typically made from pre-galvanized, hot-dip galvanized, or stainless steel to ensure strength and corrosion resistance. Main Steel Components1. Side Rails and Rungs In ladder-type cable trays, the side rails provide structural support, while the rungs connect the rails and support heavy power cables.

These components are usually fabricated from steel sheets conforming to standards such as BS EN 10130, BS EN 10131, and BS EN 10051, ensuring mechanical strength and durability. 2. Tray Base and Side Walls For perforated or solid-bottom trays, the tray base supports the cables, while side walls provide lateral containment.

Perforated bases allow airflow and drainage, whereas solid bases offer maximum protection against dust and debris. These parts are also made from steel, often pre-galvanized or hot-dip galvanized, to resist corrosion. 3.

Fittings and Accessories Steel fittings such as elbows, tees, reducers, and junctions connect tray sections and maintain cable routing. Accessories like covers, brackets, and hangers are also made from steel to match the tray's mechanical and environmental requirements. Types of Steel Used1.

Pre-

Galvanized Steel Steel coated with zinc before fabrication, providing economical corrosion protection. The zinc layer forms a protective patina that slows corrosion and offers sacrificial protection for exposed areas. 2.

Hot-

Dip Galvanized Steel Steel immersed in molten zinc, creating a thicker, more durable coating than pre-galvanization. This is suitable for harsh or outdoor environments where long-term corrosion resistance is required. 3.

Stainless Steel (AISI 316L) Used in highly corrosive environments, stainless steel contains chromium and molybdenum, forming a protective oxide layer that resists pitting and stress corrosion. Ideal for chemical plants, coastal areas, or applications requiring high hygiene standards.

Standards and Compliance

Steel cable trays are manufactured to comply with BS EN 61537: 2023, NEMA, and international cabling standards like CENELEC EN 50173-1 and ISO/IEC 11801-1: 2017. These standards ensure mechanical strength, electrical safety, and compatibility with cable management systems.

Summary

Steel components in cable trays—side rails, rungs, tray bases, side walls, and fittings—are designed for structural integrity and corrosion resistance. Selection of pre-galvanized, hot-dip galvanized, or stainless steel depends on environmental conditions, load requirements, and application type, ensuring a durable and safe cable management system.

Composition and Structure of Steel Cable Trays - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Composition and Structure of Steel Cable Trays

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