Angle Requirements for Cable Tray Fabrication

Cable tray systems require precise fabrication of support structures using MS angles and channels, with proper spacing, welding, and fasteners to ensure safe and compliant installation.

Fabrication of Cable Tray Supports

Cable tray supports are typically fabricated using Mild Steel (MS) angles and C-channels. For example, wall-mounted supports often use MS angles of 50 x 50 mm with 6 mm thickness, spaced at 1-meter intervals along the tray route, while bridge supports may use MS C-channels of 150 x 75 mm with 5.7 mm thickness, welded to the angle supports for added stability . The fabrication process includes:

• Cutting and welding MS angles and channels to form a rigid support structure.
• Ensuring proper alignment and leveling to maintain tray integrity.
• Using high-strength fasteners such as M8 galvanized or stainless steel bolts, washers, and nuts for secure connections .

Angle Requirements and Installation

Angles are critical for supporting cable trays and maintaining structural stability. Key points include:

• Support angles should be sized according to the load of the cable tray and cables, typically 50 x 50 mm, 6 mm thick for wall-mounted supports .
• Bridge supports use larger C-channels with welded angles to span longer distances and support heavier loads.
• Spacing between supports is generally 1 meter, but may vary depending on tray type, cable weight, and site conditions .
• Isolation materials such as G-10 or FRP sheets are used at each support to prevent electrical contact with the metal structure .

Cable Tray Specifications

• Tray size: Commonly 300 x 50 mm with 1.6 mm thickness for perforated GI trays .
• Bends and radius: Adequate bend radius must be maintained to prevent cable damage, especially for high-voltage or fiber optic cables .
• Fastening: Each joint between trays uses eight M8 hardware sets with coupler plates to ensure mechanical stability .
• Additional supports: Extra supports may be fabricated as needed based on site conditions to maintain tray alignment and prevent sagging .

Compliance with Standards

Cable tray fabrication and installation should comply with IEC 61537, which specifies:

• Mechanical strength to support cable loads.
• Corrosion resistance for steel, stainless steel, or aluminum trays.
• Electrical continuity for grounding purposes.
• Fire resistance and ventilation requirements .

Practical Considerations

• Use rollers or suitable lifting equipment to prevent cable insulation damage during laying.
• Maintain proper clamping intervals (typically 1 meter) to secure cables within the tray.
• Ensure compatibility of bends, risers, and accessories with the main tray system for seamless installation . By following these fabrication and angle requirements, cable tray systems can achieve structural integrity, safety, and compliance with international standards, ensuring long-term reliability in industrial and commercial installations.