What are the cable trays in cable shafts called

Cable trays in cable shafts come in multiple models—ladder, trough, solid bottom, and channel—made from steel, aluminum, or stainless steel, designed to meet ANSI/NFPA, ASTM, and NEMA standards.

Types of Cable Trays

1. Ladder Type: Features two side rails connected by rungs, ideal for heavy-duty power cables and long cable runs. It allows excellent ventilation and heat dissipation, reducing the risk of overheating .

2. Trough Type: Enclosed on three sides with a ventilated or solid bottom, suitable for medium-duty applications and provides protection against mechanical damage .

3. Solid Bottom Type: Fully enclosed tray that protects cables from dust, moisture, and electromagnetic interference. Often used in sensitive instrumentation or control applications .

4. Channel Type: Narrow, U-shaped tray used for short cable runs or branch connections. Can be ventilated or solid and is often used where aesthetics or space constraints are important .

Materials and Finishes

• Steel: Pre-galvanized or hot-dip galvanized for corrosion resistance; suitable for indoor and outdoor installations .
• Aluminum: Lightweight, corrosion-resistant, and formable; ideal for environments with atmospheric exposure .
• Stainless Steel (AISI 316L): High corrosion resistance, especially in chemical or marine environments; includes molybdenum for enhanced durability .
• FRP (Fiberglass Reinforced Polyester): Provides high resistance-to-weight ratio and corrosion resistance in aggressive environments .

Standards and Compliance

Cable trays must comply with:

• ANSI/NFPA 70 – National Electrical Code .
• NEMA VE 1 & VE 2 – Metallic cable tray systems and installation guidelines .
• ASTM Standards – Including A123, A653, A1011, A1008, and B633 for steel and zinc coatings .
• CE Marking – For European compliance, verified by third-party audits .

Installation Considerations

• Maintain proper rung spacing (typically 150–230 mm) to support cables and prevent sagging .
• Ensure minimum bend radius for cables at tray exits to avoid damage .
• Use supports and accessories such as bends, tees, elbows, and drop-outs to follow the cable route accurately .
• Select tray type and material based on load, environment, and thermal considerations .

Summary

Cable trays in cable shafts are available in ladder, trough, solid bottom, and channel models, with materials chosen for strength, corrosion resistance, and environmental suitability. Compliance with ANSI, NEMA, ASTM, and CE standards ensures safety and reliability. Proper selection, spacing, and installation of trays and accessories are critical for maintaining cable integrity, heat dissipation, and long-term performance .