To transition a cable tray from 300 mm to 200 mm, use a reducer or fabricate a custom bend while maintaining proper support and bend radius.

Using a Reducer

A cable tray reducer is the standard solution for changing tray width. It connects the larger 300 mm tray to the smaller 200 mm tray, ensuring a smooth transition without sharp edges that could damage cables. Reducers are available in pre-fabricated forms for common sizes, which simplifies installation and maintains structural integrity .

Fabricating a Bend

If a pre-fabricated reducer is not available, you can fabricate a custom bend to reduce the width:

1. Mark the Bend: On a flat sheet or tray section, mark the centerline and sides for the 200 mm width. Decide the bend angle (commonly 90° or 45°) and divide the curve into equal segments for a smooth radius .
2. Cut Side Walls: Make triangular or rectangular cuts on the side walls to allow folding without deforming the tray.
3. Form the Bend: Use a manual bender, press brake, or hydraulic bending tool to gradually form the curve, ensuring uniformity.
4. Reinforce and Join: Rejoin the side walls using welding, rivets, or bolts to maintain strength.
5. Drill Connection Holes: Prepare holes at each end for connecting to the 300 mm and 200 mm tray sections .

Considerations for Installation

• Bend Radius: Maintain a minimum bend radius suitable for the cables to prevent damage, typically following manufacturer guidelines .
• Support Spacing: Ensure proper support spacing along the transition to prevent sagging or stress on cables.
• Field vs Pre-Fab: For standard offsets, pre-fabricated reducers save time and ensure consistent angles. Field bending is recommended for non-standard dimensions or tight spaces .
• Safety and Protection: Use protective caps or edge treatments to prevent cable abrasion at cut or bent edges .

Summary

Transitioning from a 300 mm to a 200 mm cable tray can be achieved using either a pre-fabricated reducer or a custom-fabricated bend. Key factors include maintaining proper bend radius, structural integrity, and cable protection. Pre-fabricated solutions are faster and more consistent, while field fabrication allows flexibility for unique installation constraints .