Cable Tray Thickness Guide: How to Choose the Right Steel Thickness

Choosing the right cable tray thickness is an important part of designing a safe, durable, and cost-effective cable management system.

Cable tray thickness affects the tray's mechanical strength, load capacity, rigidity, resistance to deformation, and overall service life. However, thickness should not be selected based on thickness alone.

The appropriate steel thickness depends on several factors, including cable load, tray width, tray height, support span, material, installation environment, and applicable standards.

In this guide, we explain the key factors to consider when selecting the right steel thickness for cable trays used in industrial plants, commercial buildings, data centers, power projects, and renewable energy installations.

What Does Cable Tray Thickness Mean?

Cable tray thickness generally refers to the thickness of the steel sheet used to manufacture the tray body, side rails, or other structural components.

Common steel cable tray thicknesses may include:

• 1.0 mm

• 1.2 mm

• 1.5 mm

• 2.0 mm

• 2.5 mm

• 3.0 mm

The available thickness range depends on the cable tray type, dimensions, material, manufacturing process, and project specifications.

For example, a small cable tray carrying a relatively light cable load may require a different thickness from a wide cable tray carrying heavy power cables over a long support span.

Therefore:

A thicker cable tray is not automatically the correct cable tray.

The correct selection should be based on the complete design condition.

5. What Factors Determine Cable Tray Thickness?

There are several important factors to consider when selecting cable tray steel thickness.

1. Cable Load

The first consideration is the total weight of cables installed in the tray.

Cable load is usually expressed as:

kg/m or N/m

The heavier the cable load, the greater the structural strength required from the cable tray system.

For example, a tray carrying:

• Control cables

• Instrumentation cables

• Communication cables

may require less structural capacity than a tray carrying multiple large power cables.

When selecting thickness, engineers should consider both the current cable load and potential future cable additions.

2. Cable Tray Width

Tray width also affects structural performance.

A wider cable tray generally experiences greater bending stress between supports than a narrow tray under the same loading conditions.

Typical cable tray widths may include:

• 100 mm

• 150 mm

• 200 mm

• 300 mm

• 450 mm

• 600 mm

• 750 mm

• 900 mm

• 1000 mm or more

As the tray becomes wider, the required structural design may also change.

Therefore, a 1.5 mm thick tray cannot automatically be considered suitable for every width.

3. Support Span

Support span is one of the most important factors when selecting cable tray thickness.

Common support spans include:

• 1.5 m

• 2.0 m

• 2.5 m

• 3.0 m

A longer support span generally creates greater bending stress and deflection.

For example, a cable tray designed for a 2 m support span may require a different structural configuration from a tray designed for a 3 m support span, even if the cable load is the same.

This is why cable tray load capacity should always be evaluated together with the specified support span.

6. Cable Tray Material and Thickness

The material used for the cable tray also affects corrosion resistance and mechanical performance.

Common materials include:

Hot-Dip Galvanized Steel (HDG)

HDG cable trays are widely used in industrial and outdoor applications where good corrosion resistance is required.

They are commonly used for:

• Industrial plants

• Power plants

• Solar projects

• Outdoor cable routes

• Infrastructure projects

Zinc-Aluminum-Magnesium (ZAM) Steel

ZAM-coated steel provides excellent corrosion resistance and is increasingly used for outdoor and demanding environments.

It can be a suitable option for:

• Solar PV projects

• Coastal environments

• Southeast Asian climates

• Industrial facilities

• Outdoor cable management systems

Stainless Steel

Stainless steel cable trays are normally selected for highly corrosive or hygienic environments.

Common applications include:

• Chemical plants

• Food processing facilities

• Marine environments

• Wastewater treatment plants

• Pharmaceutical facilities

Because different materials have different properties and costs, material selection should be considered together with steel thickness.

7. Is a Thicker Cable Tray Always Better?

Not necessarily.

Using a thicker steel sheet can increase structural strength, but it also increases:

• Material consumption

• Product weight

• Transportation cost

• Manufacturing cost

• Installation effort

For example, using 3.0 mm steel for a light-duty indoor cable route may provide unnecessary structural capacity and increase project cost.

On the other hand, selecting a very thin tray for a heavy-duty industrial application may result in:

• Excessive deflection

• Permanent deformation

• Insufficient load capacity

• Damage during installation

• Reduced service life

The goal is therefore to select the appropriate thickness for the actual project requirements, rather than simply choosing the thickest available option.

8. Cable Tray Thickness and Load Capacity

One common mistake is to determine cable tray load capacity only from steel thickness.

For example:

“A 2.0 mm cable tray can carry X kg/m.”

This statement may be incomplete without specifying:

• Tray width

• Tray height

• Tray type

• Material

• Support span

• Load distribution

• Connection method

• Deflection requirements

• Applicable standard

The same 2.0 mm steel thickness can produce different structural performance in different tray configurations.

For this reason, cable tray manufacturers should provide load test data or technical documentation for specific configurations where required.

9. Cable Tray Thickness Selection Example

Suppose an industrial project requires a cable tray with:

Width: 600 mm
Height: 100 mm
Support span: 2 m
Application: Power cables
Environment: Outdoor
Material: HDG steel

The engineer should not simply choose a thickness based on width.

Instead, the selection process should consider:

1. Total cable load per meter

2. Tray dimensions

3. Support span

4. Required safety factor

5. Allowable deflection

6. Material and coating

7. Applicable project standard

8. Manufacturer's test data

The final thickness can then be selected based on the structural requirements.

10. Cable Tray Thickness for Different Applications

Different applications may have different structural requirements.

Commercial Buildings

Cable trays used for lighting, communication, and low-voltage systems may have relatively moderate loading requirements.

Industrial Plants

Industrial projects often require higher load capacity because of power cables, control cables, instrumentation systems, and long cable routes.

Data Centers

Data centers require careful cable management because of high cable density, power distribution requirements, and future expansion.

Cable tray selection should consider both load capacity and cable segregation requirements.

Solar PV Projects

Solar projects often use long outdoor cable routes exposed to:

• Wind

• Rain

• UV exposure

• Temperature changes

• Corrosive environments

Material selection and corrosion protection can therefore be as important as steel thickness.

11. Cable Tray Thickness and Standards

Cable tray selection should follow the applicable project standards and specifications.

Depending on the project location and customer requirements, relevant standards may include:

• IEC 61537 – Cable management systems – Cable tray systems and cable ladder systems

• JB/T 10216 – Cable tray systems used in China

• Project-specific engineering specifications

• Local electrical installation requirements

For international projects, buyers may request cable tray products tested according to IEC 61537 or supported by relevant third-party testing documentation.

A professional cable tray manufacturer should be able to provide technical specifications, drawings, material information, and relevant test documentation when required.

12. How to Choose the Right Cable Tray Thickness

A practical selection process can be summarized as follows:

Step 1: Determine the cable load

Calculate the approximate total cable weight per meter.

Step 2: Determine tray dimensions

Select the required:

• Width

• Height

• Length

Step 3: Determine support span

Confirm whether the system will use 1.5 m, 2 m, 2.5 m, 3 m, or another support span.

Step 4: Select the material

Consider:

• Indoor or outdoor installation

• Humidity

• Coastal exposure

• Industrial atmosphere

• Corrosion requirements

Step 5: Check load capacity

Confirm the required load capacity using manufacturer data or appropriate testing.

Step 6: Check deflection

The tray should maintain acceptable deflection under the specified load and support conditions.

Step 7: Confirm project standards

Check whether the project requires IEC 61537, JB/T 10216, or another standard.

Step 8: Optimize the final specification

Select the appropriate combination of:

Tray type + dimensions + material + thickness + support span

rather than selecting thickness alone.

13. Cable Tray Thickness Checklist

Before ordering cable trays, buyers and engineers should confirm:

Providing these details to a manufacturer can help engineers and procurement teams obtain a more accurate technical proposal and quotation.

14. Why Work With an Experienced Cable Tray Manufacturer?

Cable tray thickness selection is not simply a matter of choosing a thicker steel sheet.

An experienced manufacturer can help customers evaluate:

• Cable tray dimensions

• Steel thickness

• Load capacity

• Support span

• Material selection

• Corrosion protection

• Accessories

• Testing requirements

• Project specifications

For large industrial, infrastructure, data center, and solar projects, manufacturers should be able to provide technical drawings and relevant testing documentation according to project requirements.

15. Final Takeaway

The right cable tray thickness depends on the complete system design.

The key factors are:

Cable Load + Tray Width + Tray Height + Support Span + Material + Installation Environment + Applicable Standards

A thicker tray is not always better, and a thinner tray is not always more economical.

The best solution is to select the appropriate thickness based on the actual project requirements and verify the resulting load capacity and deflection.

Need help selecting the right cable tray thickness for your project?

Send us your tray width, height, cable load, support span, material preference, and project requirements, and our engineering team can help recommend a suitable cable tray configuration.

Shenzhen Wanan Industrial Co., Ltd.
Cable Tray & Solar PV Mounting Systems Manufacturer in China

MOB/Whatsapp:+86 18823394830 

Email: admin@szwaindustry.com 

Address：Wanan Industrial Park, Fengdong Village, Xinxu Town, Huicheng District, Huizhou，Guangdong

www.szwa-industry.com