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Cable tray fittings connecting plate specifications

Fiber and communications infrastructure knowledge brief Published 04 Jan 2025

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Cable tray connecting plates are metallic components designed to join sections of cable trays, providing structural integrity and corrosion protection according to industry standards.

Material and Coating

Connecting plates are typically made from high-strength steel or aluminum alloys, chosen for mechanical durability and corrosion resistance. Common finishes include: Hot-dip galvanized steel (ASTM A123, ASTM A653) for corrosion protection. Electrodeposited zinc coatings (ASTM B633) for indoor or mild environments.

ULTRA GALV

A coating, a zinc-magnesium-aluminum alloy, offering self-healing cathodic protection and superior resistance to red and white rust, suitable for aggressive indoor and outdoor environments.

Standards and Compliance

Connecting plates must comply with recognized standards to ensure safety and performance: ANSI/NFPA 70 (National Electrical Code) for electrical safety.

NEMA V

E 1 for metallic cable tray systems.

AST

M standards for steel sheet quality and coatings, including A1011, A1008, A123, A653, B633.

Design and Dimensions

Plates are designed to fit ladder, trough, solid-bottom, or channel-type trays. Typical features include pre-drilled holes for bolted connections and reinforced edges to maintain alignment and structural integrity. Thickness and size vary depending on tray width, load rating, and environmental conditions, generally ranging from 2 mm to 6 mm for steel plates in standard industrial applications.

Installation Considerations

Connecting plates are used to join straight sections, bends, tees, or drop-outs in a cable tray system. Proper installation ensures load distribution, alignment, and continuity of grounding. Plates should be compatible with the tray's ventilated or solid bottom design and maintain the minimum bend radius for cables exiting the tray.

Environmental and Performance Features

Coatings like ULTRA GALVA provide long-term protection in corrosive environments and are 100% recyclable, reducing environmental impact. Aluminum plates offer exceptional corrosion resistance due to a natural oxide layer, suitable for outdoor or humid conditions. Selection of material and finish should consider mechanical strength, environmental exposure, and electrical grounding requirements.

In summary, cable tray connecting plates are engineered to ensure structural stability, corrosion resistance, and compliance with electrical and mechanical standards, with material, coating, and dimensions selected based on the specific application and environmental conditions.

Cable tray fittings connecting plate specifications - ROGER FIBRE ATELIER [PDF]

Cable tray fittings connecting plate specifications

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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