Cable tray specifications and connector specifications

Cable tray connectors are designed to join, support, and maintain continuity in cable tray systems, and must comply with standards such as ANSI/NFPA 70, NEMA VE 1, and ASTM specifications.

Types of Cable Tray Connectors

Cable tray connectors include splice plates, expansion joints, tees, elbows, drop-outs, and straight couplings. These connectors are used to join straight sections, accommodate changes in direction, and allow for thermal expansion or contraction in the tray system. Common connector types include: Splice Plate Connectors: Used to join two straight sections of tray, ensuring mechanical strength and electrical continuity.

Expansion Joints: Allow for thermal expansion and contraction without stressing the tray or cables. Elbows and Tees: Facilitate changes in direction or branching of cable runs.

Drop-

Outs: Enable cables to exit the tray at specific points.

Materials and Finishes

Connectors are typically made from steel, stainless steel, or aluminum, with various galvanized or coated finishes to enhance corrosion resistance. Common material standards include: ASTM A123: Zinc (hot-dip) coatings on steel shapes.

AST

M A653 / A1008 / A1011: Steel sheet specifications for structural and high-strength applications.

AST

M B633: Electrodeposited zinc coatings for corrosion protection.

Standards and Compliance

Cable tray connectors must comply with electrical and mechanical standards to ensure safety and reliability: ANSI/NFPA 70 (National Electrical Code): Governs installation and safety requirements.

NEMA V

E 1 & VE 2: Define metallic cable tray systems and installation guidelines.

U

L Certification: Ensures connectors meet safety and performance requirements.

C

E Marking: Indicates compliance with European directives for electrical safety.

Installation Considerations

Mechanical Strength: Connectors must support the load of cables over the specified span and maintain structural integrity. Electrical Continuity: Metal connectors often provide grounding continuity between tray sections. Field Verification: Dimensions, routing, and alignment must be verified on-site before installation.

Modular Design: Many systems allow connectors to be easily configured for new or existing cable routes, mounted on floors, walls, ceilings, or equipment racks.

Documentation and Submittals

For project compliance, manufacturers typically require: Submittal Drawings: Scaled drawings showing connectors, clamps, brackets, and fittings. Product Data Sheets: Detailing materials, finishes, dimensions, rung spacing, and fitting radii.

BO

M (Bill of Materials): Complete list of connectors and accessories for accurate project planning. By selecting connectors that meet these specifications, engineers and contractors ensure safe, durable, and code-compliant cable tray installations suitable for industrial, commercial, and data center environments.