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Does the cable tray tender not include bends

If a cable tray tender does not include bends, field-fabricated or pre-purchased bends must be considered to maintain proper cable routing and minimum bend radius compliance. Implications of Missing Bends in a TenderWhen a cable tray tender excludes bends, the installation may face challenges in routing cables around corners, obstacles, or changes in elevation. Bends are essential to: Maintain the minimum bend radius for cables, preventing damage or signal degradation (IEC 61537, NEC 392.

18)Ensure mechanical integrity and proper support of cablesFacilitate future maintenance or cable additions without excessive stress on the cables Without specified bends, installers may need to fabricate bends in the field by cutting and bolting straight tray sections together. While this is allowed under NEC 392. 18, it may result in sharp angles that do not provide a smooth curve, potentially stressing the cables.

Options for Managing BendsPre-fabricated bends: Manufacturers offer bends in various radii (e.g., 12”, 24”, 36”, 48”) for standard tray widths. Using these ensures compliance with cable bend radius requirements and simplifies installation. Field-fabricated bends: Straight sections can be cut and bolted to form a bend.

Care must be taken to avoid sharp angles that violate the minimum bend radius of the cables. This method is more labor-intensive and may require additional supports. Specialty trays: Products like SnakeTray are designed for complex routing with multiple odd bends, providing flexibility when standard bends are not included in the tender.

Standards and ComplianceIEC 61537: Ensures cable trays are compatible with bends, risers, and accessories, and specifies mechanical performance and minimum bend radius requirements.

NE

C 392. 18: Allows field bends but emphasizes that the bend must not compromise cable integrity.

NEM

A VE-1: Provides guidance on metallic cable tray systems, including bend fabrication and installation practices.

Recommendations

Verify the minimum bend radius for all cables to be installed. Consider purchasing pre-fabricated bends to reduce installation risk and maintain compliance. If field-fabricating bends, ensure smooth transitions and adequate support to prevent cable damage.

Document all bends and installation methods for future maintenance and compliance audits. By addressing bends proactively, even if the tender does not include them, the installation can remain safe, compliant, and maintain cable performance.

Does the cable tray tender not include bends
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