Complete Guide to Cable Tray Corners

Effective cable tray corner treatment involves using factory fittings or on-site cutting and bending while maintaining proper bend radius, grounding, and compliance with electrical codes. Corner Treatment Methods1.

Factory-

Made Fittings

Elbows and radius bends are pre-fabricated to navigate 90-degree or other angled turns. These fittings ensure consistent bend radius, reduce stress on cables, and simplify installation. Commonly used for rigid trays where on-site bending is impractical.

2.

On-

Site Cutting and Bending (Mesh Cable Trays)Wire mesh trays can be cut and bent on-site to fit around corners, columns, or tight ceiling spaces, offering flexibility in dynamic environments. Strategic side cuts allow smooth corner transitions without sharp bends. Maintain the minimum bend radius for sensitive cables like Ethernet and fiber to prevent damage.

After modification, verify grounding and bonding to maintain electrical safety. Avoid overfilling trays at corners to prevent cable compression and overheating. 3.

Material-

Specific Considerations

Aluminum trays naturally resist corrosion and can be bent carefully without compromising structural integrity. Steel trays may require additional surface treatment after cutting or bending to prevent corrosion, such as galvanization, powder coating, or painting. 4.

Tools and Safety

Use band saws, circular saws, or specialized cutting tools for precise cuts while minimizing burrs and sparks. Avoid cutting with torches, as heat can weaken the tray and damage surface treatments. Always wear appropriate PPE including gloves, eye protection, and footwear during modifications.

Best Practices

Plan tray routes to minimize sharp turns and reduce the number of modifications. Use 10-foot mesh trays where possible to reduce installation time and allow easier corner adjustments. Ensure all modifications comply with NEC Article 392 for cable tray installation and maintenance.

Consider aesthetics and accessibility for future maintenance when designing corner transitions. By combining factory fittings with careful on-site modifications, installers can achieve safe, compliant, and visually clean corner treatments for both rigid and mesh cable tray systems.