Cable tray section length should be stated clearly in every quotation request. Two offers may specify the same width, thickness and finish but use different section lengths, changing the number of pieces, joints and handling requirements.

At Rovana Trade, we prefer 3-metre straight sections as the starting point for supply, unless project specifications or site conditions call for another length. Compared with shorter sections, this reduces the number of pieces and joints along an equivalent straight route. It is a supply recommendation, not a universal structural requirement.

What does cable tray section length mean?

Section length is the length of one straight piece before it is joined to adjacent pieces. It is separate from tray width, side height and material thickness. State each dimension and its unit explicitly in the order.

Available lengths vary by system, manufacturing capability and contract requirements. Confirm the actual supplied length in the quotation and approved drawing rather than assuming all manufacturers use the same standard.

Why do we prefer 3-metre sections?

Fewer sections and joints than shorter lengths

For a theoretical 30-metre straight run, 3-metre sections require 10 pieces, while 2-metre sections require 15. With direct connections and no fittings, cuts or expansion provisions, that means 9 joints rather than 14.

Fewer joints can reduce splice assembly work. Actual installation time and cost still depend on site conditions, fixing details and the selected system.

Clearer procurement and counting

A repeated 3-metre length makes it easier to translate regular straight runs into a piece count and reconcile deliveries. Specifying length also prevents comparisons based on a “price per piece” when the pieces contain different numbers of metres.

A useful starting point for layout planning

Start by laying out the approved straight sections, then account for fittings and short pieces. Base cutting and ordering quantities on the actual route breakdown, rather than the combined route length alone.

A simple 2-metre versus 3-metre example

For an idealized 30-metre straight route, excluding waste, overlap, fittings and other installation details:

2-metre sections: 15 pieces and 14 joints between them.
3-metre sections: 10 pieces and 9 joints between them.
Difference: 5 fewer pieces and 5 fewer joints with 3-metre sections.

This is a piece-count example only. Splice plates and fasteners per joint depend on the system design. Support quantity cannot be derived from section count.

Section length is not support spacing

A 3-metre tray section does not automatically permit supports at 3-metre centres. Support spacing depends on approved system load data, cable weight, tray profile, installation conditions and project requirements.

Joint positions relative to supports must also follow the approved system instructions and drawings. Do not select permissible spans or joint locations from section length alone.

When should a different length be considered?

Review transport, access openings, lifts and storage arrangements before ordering. Shorter sections may suit restricted access or particular short routes.

Other systems or projects may require different lengths. Confirm availability, approval, handling and support requirements. A longer piece does not automatically provide greater load capacity or lower total installed cost.

How to estimate the number of sections

Divide each straight run by the section length, then prepare a cutting plan and review usable offcuts. A 12-metre run theoretically uses four 3-metre pieces before accounting for connection details, fittings and installation requirements.

Dividing the combined length of every route by three is not a final takeoff. Cut locations and reusable offcuts affect the order. Determine any waste allowance from the actual layout rather than applying one percentage to every project.

What to write in the purchase request

Specify system type, width, side height, thickness, material and finish, followed by required section length: 3 metres. State linear metres and, where practical, the corresponding piece count. Clarify whether splice plates, fasteners and covers are included or separate.

Use our cable tray BOQ checklist and accessories guide to complete the scope.

Frequently asked questions

Is 2 metres or 3 metres better?

We prefer 3-metre sections where project requirements and site conditions allow, because they reduce pieces and joints compared with 2-metre sections along the same straight run. Use a different approved length when required by the design or site constraints.

Can I compare suppliers by price per piece?

Compare price per linear metre with matching dimensions, material, thickness, finish and accessory scope. A 2-metre piece and a 3-metre piece are not directly comparable by piece price alone.

Does a 3-metre piece carry more load than a 2-metre piece?

Length alone does not establish load capacity. Check the actual system data, profile, support span and design loads.

Request the right section length for your project

Send drawings, sizes and quantities, identifying 3 metres as the preferred section length or specifying any approved alternative and access constraints. Request a quotation from Rovana Trade and use our receiving checklist when materials arrive.

Technical reference

The Eaton cable tray design considerations guide discusses reviewing section length alongside support span and system data. The 3-metre preference in this article is Rovana Trade's supply recommendation, not a mandatory length for every system.

Cable Tray Section Length: Why We Prefer 3 Metres