Is it okay to make a bend in the cable tray

Yes, cable trays can be bent, but only using proper fittings or approved methods to maintain structural integrity and comply with electrical codes.

Proper Bending Practices

Cable trays are designed to accommodate directional changes, but field bending must follow manufacturer specifications and code requirements. The National Electrical Code (NEC) allows field bends, but the tray must remain strong, smooth, and properly supported to prevent damage to cables and maintain grounding continuity . Simply cutting and manually bending a tray without fittings is not recommended, as it can compromise safety and may fail UL inspections .

Minimum Bend Radius

The bend radius is critical to prevent cable damage. Each cable type has a manufacturer-specified minimum bending radius, which depends on cable diameter and insulation type. For example, a cable with a 12.2-inch bending radius can be safely routed through a tray bend with a radius equal to or greater than 12.2 inches . Using bends that are too tight can cause insulation deformation, reduce cable lifespan, and make future maintenance difficult .

Types of Bends

Cable trays can include various bends:

• Horizontal bends: Change direction on the same plane, typically 30°–90°.
• Vertical inside/outside bends: Move cables up or down between levels.
• T-junctions: Split the tray into multiple paths on the same plane . For wire mesh or ladder trays, bends are often made using pre-fabricated fittings or flexible tray systems like Snake Tray®, which allow smooth curves without cutting or compromising the tray .

Recommendations

1. Use manufacturer-approved fittings for all bends whenever possible.
2. Maintain the minimum bend radius for the cables being installed.
3. Avoid field modifications such as cutting rungs or bending straight sections manually, unless the tray system is specifically designed for it.
4. Provide proper support at bends to maintain structural integrity and grounding continuity.
5. Check for sharp edges that could damage cable insulation and ensure smooth transitions . Following these guidelines ensures that cable trays are safe, code-compliant, and maintain cable performance over time.