18-degree cable tray fabrication

Fabricating an 18-degree cable tray bend involves precise measurement, cutting, and forming using either live bending or prefabricated fittings, ensuring structural integrity and compliance with standards.

Tools and Materials

To fabricate an 18-degree bend in a cable tray, you will need:

• Cable tray sections (wire mesh, ladder, or solid-bottom type)
• Measuring tools (protractor, angle finder, tape measure)
• Cutting tools (bolt cutters for wire mesh, saws for ladder trays)
• Bending tools (manual benders, hydraulic benders, or jig setups)
• Protective caps for cut ends to prevent damage to cables and maintain safety

Fabrication Methods

1. Live Bending

For wire mesh cable trays, bends can be made directly on-site using a bolt cutter or bending jig. The process involves:

• Marking the desired 18-degree angle on the tray section
• Using a bending jig or manual force to gradually form the bend
• Ensuring the bend is smooth to avoid sharp edges that could damage cables
• Applying rubber caps or protective coatings to the cut ends to maintain corrosion protection

2. Prefabricated Fittings

For ladder or solid-bottom trays, it is often more precise to use prefabricated 18-degree elbows:

• These are manufactured using CMT or TIG welding for ladder trays, ensuring strong, splatter-free joints
• Prefabricated bends reduce on-site labor and maintain consistent angles and structural integrity

3. Measurement and Alignment

• Use a protractor or digital angle finder to verify the 18-degree angle
• Ensure the tray is properly supported during bending to prevent deformation
• Check alignment with adjoining tray sections to maintain smooth cable routing

Safety and Standards

• Follow NEMA and CSA/NEC guidelines for cable tray installation and fabrication
• Ensure all cuts and bends maintain the tray's load-bearing capacity
• Use protective gear when cutting or welding to prevent injury

Tips for Accuracy

• Gradually bend the tray in small increments rather than forcing a single 18-degree bend
• For wire mesh trays, ensure the zinc coating remains intact to prevent corrosion
• Verify the bend with a test piece before applying to the main installation By combining precise measurement, proper tools, and protective measures, an 18-degree cable tray bend can be fabricated efficiently while maintaining safety and compliance with electrical standards.