Can electrical workers weld cable tray bends

Electrical workers can weld cable tray bends in certain situations, but it is generally preferred to use pre-fabricated bends or bolted connections to maintain structural integrity and comply with standards.

Field Fabrication and Welding

Cable trays, especially metallic types like steel or galvanized trays, can be fabricated in the field to fit specific layouts. Welding is sometimes used to attach MS (mild steel) support structures or bridge sections for cable trays, particularly when custom supports or long spans are required. For example, contractors may weld MS 'C' channels or angle supports to create a continuous tray run, after which the cable tray sections are bolted to these supports.

After welding, surfaces are typically coated with primer and enamel paint to prevent corrosion.

Pre-

Fabricated vs.

Field Bends

While welding is possible, most cable tray bends are pre-fabricated with specific radii (e.g., 12”, 24”, 36”, 48”) to ensure smooth cable routing and avoid sharp bends that could damage cables. Field bending by cutting and bolting straight sections together is also common, but this creates angular bends rather than smooth curves, which may not be ideal for cable pulling.

The NE

C 392. 18(A) allows field bends, but the method must not compromise cable integrity.

Considerations for Cable Protection

When welding or fabricating bends in the field, it is important to: Maintain the minimum bend radius for the cables to prevent insulation damage. Ensure mechanical support and strain relief for long cable runs. Use insulation or isolation materials at welded points to prevent electrical contact or corrosion.

Best Practices

Use pre-fabricated bends whenever possible for standard radii and easier installation. Reserve welding for structural supports or custom tray configurations where bolting is impractical. Always follow manufacturer guidelines and local electrical codes to ensure safety and compliance.

In summary, while electrical workers can weld cable tray bends in specific structural applications, the preferred approach is to use pre-fabricated bends or bolted connections to maintain proper cable routing, minimize sharp angles, and comply with standards.