Specifications of Cable Tray Connectors

Cable tray connectors must ensure mechanical strength, electrical continuity, and compatibility with tray types, following industry standards such as NEMA VE 1/2 and ASTM specifications.

Connector Types and Functions

Cable tray connectors are used to join sections of cable trays, maintain alignment, and provide structural support. Common types include:

• Splice Plate Connectors: Flat plates bolted across tray ends to join straight sections.
• Couplers: Integral or external devices that connect tray ends quickly, often used in modular systems.
• Expansion Joint Assemblies: Allow for thermal expansion and contraction in long tray runs.
• Adjustable Bends and Risers: Facilitate changes in direction or elevation while maintaining cable support .

Material and Finish

Connectors are typically made from steel, stainless steel, or aluminum, with finishes selected based on environmental conditions:

• Hot-dip galvanized steel (ASTM A123, A653) for corrosion resistance.
• Electrodeposited zinc coatings (ASTM B633) for indoor applications.
• Stainless steel (AISI 316L) for high-corrosion environments.
• Aluminum connectors provide a lightweight, corrosion-resistant alternative .

Mechanical and Electrical Requirements

• Load Capacity: Connectors must support the tray's rated load, considering span and cable weight.
• Rung Spacing: Typically 6–9 inches (150–230 mm) to maintain cable support and prevent sagging.
• Electrical Continuity: Connectors should maintain grounding and bonding across tray sections, ensuring safe current paths and minimizing electromagnetic interference .
• Installation: Fastening methods include bolts, clips, or Swiftclip systems, designed for quick assembly while maintaining strength and alignment .

Standards and Compliance

• NEMA VE 1: Metallic cable tray system standards.
• NEMA VE 2: Installation guidelines for cable trays and connectors.
• ANSI/NFPA 70 (NEC): Electrical code compliance.
• ASTM Standards: A123, A653, A1011, A1008, B633 for material and coating specifications .

Installation Considerations

• Field verification of dimensions and routing is required before installation.
• Submittal drawings should include all connectors, clamps, brackets, and fittings with accurate scaling.
• Product data must specify materials, finishes, fitting radii, and inside depths to ensure compatibility with the selected cable tray system . By following these specifications, cable tray connectors provide structural integrity, electrical safety, and ease of installation, ensuring reliable cable management in industrial, commercial, and data center environments.