What Is Cable Trunking in Electrical Installation?

Cable Trunking Explained

Purpose of Cable Trunking

The purpose of cable trunking is to organise, protect and hide away electrical cables in a safe and efficient way. By housing wires inside a durable enclosure, trunking prevents damage from impact, moisture or wear while also reducing the risk of electrical faults. It also helps keep floors and walls clear of loose cables, improving safety by eliminating trip hazards.

Cable trunking creates a cleaner, more professional appearance in homes, offices and industrial settings. It also simplifies maintenance, as cables can be accessed or replaced without disturbing surrounding structures, making it a practical solution for long-term cable management.

What is the Difference Between Cable Trunking and Conduit?

Both cable trunking and conduits manage the neatness and protection of electrical cables but do so in different ways. Cable trunking is a box-shaped enclosure, usually with a removable lid, designed to route multiple cables neatly along walls or ceilings. It offers easy access for maintenance and is ideal for offices, homes and commercial spaces.

Conduit, on the other hand, is a rigid or flexible tube that fully encloses and protects individual or grouped cables. It provides stronger mechanical protection and is commonly used in harsher environments.

Cable Trunking Materials and Appearance

The process of using cable trunking in the organisation and protection of electrical cabling is a popular one, which means there is a wide variety of options in materials and appearance to fit in with your project.

What Materials Are Available in Electrical Trunking?

Electrical trunking is available in several materials; each suited to different environments and performance needs. PVC trunking is a common choice for residential and light commercial use due to its affordability, ease of installation and good corrosion resistance. Aluminium trunking offers a lightweight but stronger alternative, ideal for settings that require improved durability. Steel trunking provides the highest level of mechanical protection and fire resistance, making it well-suited to industrial sites, warehouses and large-scale B2B projects. Stainless steel options are also available for harsh or hygienic environments where strength and cleanliness are essential, not advisory.

Benefits of Steel Cable Trunking

Steel cable trunking is the most robust level of protection for an electrical cable trunking solution. It offers long-term reliability, strong protection and resistance to the elements, which all make it the preferred choice for commercial and industrial environments or workplaces with high traffic. Its strength is great at handling any potential impact and can support heavier cable loads. This makes it a great choice for the harshest of conditions and more crucial workplaces like data centres and factories.

Key benefits include:

• Exceptional mechanical strength and impact resistance
• Superior fire resistance and heat tolerance
• Long service life with minimal maintenance
• Suitable for heavy-duty and high-capacity cable runs
• Enhanced security and protection against tampering

Cable Trunking Appearance

Cable trunking typically looks like a neat channel fitted along walls or ceilings to keep cables organised and out of sight.

PVC trunking is usually smooth, lightweight and white or neutral, helping it blend into most interior spaces with a clean, low-profile finish.

Metal trunking, such as steel or aluminium, has a more robust and industrial appearance, often with a powder-coated or galvanised surface. Multi-compartment and slotted styles are also used when cable separation or ventilation is required.

What Are the Different Electrical Cable Trunking Sizes?

Electrical cable trunking comes in a wide range of sizes to suit different cable volumes and installation needs. Smaller options, such as 25×25 mm or 25×16 mm, are commonly used for light domestic wiring or single cable runs. Medium sizes like 50×50 mm or 75×50 mm are suited to commercial spaces where multiple circuits need organising. Larger trunking, including 100×100 mm and above, is typically required for industrial sites with higher cable capacity and more complex layouts.

Lenson supplies a broad selection of cable trunking sizes designed for light work around the home or heavier-duty, industrial applications.

Cable Trunking Use Cases

Cable trunking is used across a wide range of industries because it provides organised cable management, protection from damage and easier maintenance. From offices to workshops to factories to high-tech data centres, cable trunking is a supremely useful cable management solution.

In commercial offices, it keeps power and data cables neat, helping create safer work environments and reducing trip hazards in busy spaces. Manufacturing plants rely on trunking to protect control wiring from dust, vibration and impacts. Warehouses and distribution centres use heavy-duty steel trunking to manage high-capacity cabling for machinery, lighting and crucial conveyor systems. Data centres depend on structured trunking systems to manage high volumes of cables with clear pathways that also support airflow and reduce downtime risks.

Healthcare facilities benefit from trunking because it allows essential medical equipment wiring to remain accessible while still securely contained, supporting both hygiene and safety requirements. In education settings, trunking routes IT networks, projector cables and electrical circuits in a tidy way that supports frequent layout changes. Retail stores also use trunking to hide wiring for displays, tills, CCTV systems and lighting while continuing to keep maintenance simple.

Compliance and Regulations for Cable Trunking

Health and safety regulations are designed for good reason. Whatever the environment, there are guidelines to follow for the safety of your property, products and personnel. Electricity can be a dangerous feature in a business, so it is important to ensure all electrical cable trunking is up to the correct standards.

In the UK, cable trunking must comply with British Standard 7671, which requires non-sheathed cables to be enclosed in trunking offering at least IP4X or IPXXD protection or fitted with a cover that can only be removed with a tool. Fire safety rules require flame-retardant materials, and cable supports that will not fail in a fire. Metal trunking can serve an extra purpose by acting as an earth if continuity is maintained, while plastic trunking needs a separate earth wire. Since 2017, all cables must feature ‘CE’ marking and a ‘Declaration of Performance’ that confirms their fire reaction rating.

General Installation Tips

Cable trunking is generally straightforward to install, making it an accessible and practical solution for both professional electricians and those undertaking a little DIY. Its modular design, often with snap-on or screw-on covers, allows for quick and secure routing of multiple cables along walls or ceilings. While installation is simple, planning and careful execution are always key to ensuring safety, durability and a neat finish.

Key installation tips include:

• Plan the route: Measure and mark the path to avoid obstacles as best as you can
• Secure the trunking: Use appropriate fixings for the wall or ceiling material
• Maintain cable spacing: Avoid overcrowding to prevent overheating and make future maintenance easier
• Cut and join carefully: Use proper tools to ensure clean edges and tight connections
• Allow expansion: Leave small gaps for possible thermal expansion, especially in long runs
• Check accessibility: Ensure covers can be removed easily for maintenance or cable changes

Conclusion

Cable trunking is a safe, neat, accessible and cost-effective solution for the protection and routing of wiring systems. It’s used in industries ranging from smaller domestic tasks right up to large commercial spaces where wiring is everything.

You should always consider the environment that the cables and cable trunking will be passing through when choosing which to buy. If you are merely dealing with corrosion requirements, then PVC can be a great choice. Hygiene-conscious locations should use stainless steel, and if there is a chance of any potentially damaging impact, then steel is the best option. If there is a chance of impact but weight is also an issue, then aluminium is the best course of action.

Cable Trunking With Lenson Select

Discover the full range of high-quality steel and PVC cable trunking with Lenson Select. Whether you need solutions for commercial, industrial or residential projects, our products combine durability, safety and easy installation.

We’re here to help you plan, select and install trunking that meets all compliance and performance standards. Contact us now to ensure your project benefits from reliable, long-lasting cable management solutions.