Recommended Vertical Shaft Cable Trays

Vertical shaft cable trays should be selected based on material strength, corrosion resistance, load capacity, fire safety, and compliance with installation standards.

Material Selection

Vertical cable trays are typically made from cold-rolled steel, galvanized steel, aluminum alloy, or stainless steel, depending on environmental conditions and mechanical requirements. Surface treatments such as hot-dip galvanizing or electrostatic spraying enhance corrosion resistance, meeting standards like GB/T 13912 . Stainless steel (AISI 316L) is preferred in highly corrosive environments, while aluminum offers a lightweight option with excellent atmospheric corrosion resistance . Material choice should consider mechanical strength, durability, and environmental exposure.

Design Considerations

• Tray Path: Avoid interference with ventilation ducts, water pipes, or other services; maintain a minimum clearance of 300 mm .
• Layered Installation: Maintain 150 mm spacing between power and weak-current trays; use isolation plates at crossings .
• Load Capacity: Each tray unit should support at least 200 kg/m, including cable and environmental loads such as wind or snow .
• Fire Safety: Fire resistance should meet GB 8624 Class B1, and firestop materials must be certified (GB 23864), .

Support and Span

The support system is critical for vertical trays. Properly designed supports ensure stability and prevent deformation. Support spacing depends on tray type and load:

• Short Span: 6–8 feet
• Intermediate Span: 10–12 feet
• Long Span: 14–20 feet
• Extra-Long Span: >20 feet, sometimes up to 40 feet for outdoor crossings . Splice plates should connect tray sections, and tray length must be equal to or longer than the support span to maintain structural integrity .

Compliance and Standards

Vertical cable trays must comply with national and international standards, such as GB 50303 for construction quality, DIN EN 61537 for cable support systems, and relevant fire and electrical safety codes . Proper installation ensures mechanical stability, electrical safety, and long-term reliability.

Additional Recommendations

• Use isolation plates to separate different voltage or signal types.
• Ensure minimum bend radius for cables at tray transitions.
• Consider ventilated vs. solid-bottom trays based on heat dissipation and electromagnetic interference requirements .
• Regular inspection and maintenance are recommended to prevent corrosion, mechanical damage, or fire hazards. By carefully considering material, load, fire safety, support spacing, and compliance, vertical shaft cable trays can provide a safe, durable, and efficient solution for routing power, control, and communication cables in industrial and commercial installations .