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Does the cable tray bend require a deduction

Fibre interconnection and data room reference Published 13 May 2025

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Yes, a cable tray bend typically requires a deduction to ensure the installed length matches the design, similar to bend deduction in sheet metal fabrication. Why a Bend Deduction is NeededWhen a cable tray is bent, the material along the outside of the bend stretches while the inside compresses. This changes the effective length of the tray along the bend, meaning the straight sections (legs) on either side of the bend will not add up to the total intended length unless a bend deduction is applied.

Without this adjustment, the tray may end up too long or too short, causing misalignment during installation.

How to Calculate Bend Deduction

The calculation for cable trays is conceptually similar to sheet metal bending: Bend Deduction (BD) is the amount subtracted from the sum of the straight leg lengths to get the correct flat length before bending. Factors affecting BD include: Bend angle: Sharper angles require larger deductions. Bend radius: Tighter radii increase the material stretch.

Material thickness and type: Thicker or more rigid materials may require larger adjustments. A simplified formula adapted from sheet metal work is: BD = (Leg A + Leg B) – Flat Length, where Leg A and Leg B are the straight sections adjacent to the bend. For example, if a 90° bend is made in a cable tray with legs of 1000 mm and 500 mm, and the measured flat length along the neutral axis is 1480 mm, the bend deduction would be: BD = (1000 + 500) – 1480 = 20 mm.

This 20 mm is subtracted from the total measured length to ensure the final installed tray fits correctly.

Practical Considerations

Standard bends: Many cable tray manufacturers provide tables or charts with recommended bend deductions for common angles and radii. Installation accuracy: Applying bend deduction ensures that multiple bends in a tray system align properly with supports and junctions. Material differences: Aluminum trays may require slightly different deductions than steel trays due to differences in elasticity.

In summary, applying a bend deduction for cable tray bends is essential for precise installation, and the principles from sheet metal fabrication can be adapted to calculate the correct adjustment based on bend angle, radius, and material properties.

Does the cable tray bend require a deduction - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Does the cable tray bend require a deduction
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