Flexible vs Rigid Conduits

Flexible Conduits Overview

Flexible conduits are a vital component in electrical installation. In simple terms, it is a protective and malleable form of tubing that can be used to both protect and route electrical wires on a certain path. Regardless of the material, the design remains the same, and every length of this conduit will have a spiral design that can be easily bent and morphed around any obstacle.

Advantages of Flexible Conduits

The key advantage of flexible conduits is just that. They are fantastically flexible and are ideal for protecting wires around busy environments. Because they can be bent around corners, there is less of a need for other fittings or connections. This also makes them a great choice for use in difficult and tight spaces.

Flexible conduits are built to last and will protect your wiring from impact, moisture, vibration, corrosion, UV radiation and spillages. It will do all of this while also being very easy to install. You can spend some time pushing the cables into it, or if you get it on enough, it can be pushed down and feed itself over the wires perfectly.

Because of the quick installation times, it can reduce labour times on various tasks, while also complying with all of the necessary electrical codes.

Flexible Conduit Uses

Flexible conduits are best used when the cable route is more complex. The beauty of their design means they can be sent around corners, into smaller gaps and curled into more hard-to-reach places.

They have become essential to any level of wiring project; they can be used for tidying up wires and cables in a work area, or they can also be used in outdoor environments or anywhere else hazards could be encountered. Whether in a commercial or residential setting, flexible conduits can be the right fit for your needs.

Traditional split polypropylene corrugated conduits are so durable and easy to use and maintain; they are also used to keep a vehicle’s wiring loom protected, organised and neat.

Rigid Conduit Overview

Rigid conduits are a superior option for cable management when it comes to overall protection, but are not as simple to install as their flexible counterpart. They are protective tubes that can keep wires neat and contained along more fixed pathways. They are typically used in environments where protection takes precedent over functionality.

Advantages of Rigid Conduits

Rigid cabling conduits offer significant advantages in the right situations. Compared to the flexible variant, they provide a far stronger and more secure cable management solution. The rigidity of the conduit provides a more robust barrier that can shield your electrical wires from physical damage, environmental issues and can be a perfect choice for both indoor and outdoor use.

Flexible conduits are better for more complicated areas, but will need to be tied up or attached to be kept neat and out of sight. Rigid conduits are more fixed in their fittings, so they will be more secure against various elements, as well as being a lot neater.

Conduits like this are also future-proofed, making it easy to remove and replace wires that wear down over time. Particularly with rigid PVC conduits, they are non-conductive, so any water damage won’t make them live and dangerous.

Rigid Conduit Uses

In the conversation of flexible conduit vs rigid, both PVC and galvanised options of rigid conduit provide the highest level of protection to the encompassed wiring. This makes them ideal for use in outdoor or high-traffic areas that are most susceptible to the wear and tear of daily life.

Indoors, they prevent exposure to moisture, chemicals and physical damage, ensuring safety and regulatory compliance. Common indoor materials include pre-galvanised steel and PVC, chosen for their clean finish and ease of installation.

Outdoors and underground, conduits like HDG steel safeguard wiring against weather and soil, commonly seen in car parks, street lighting and distribution networks.

In commercial spaces such as offices and hotels, conduits allow for safe, organised power and lighting distribution.

Residential use includes protecting wiring for lighting, outlets and home systems, with PVC and pre-galvanised conduits offering durability and safety.

Flexible vs Rigid Conduits: Key Differences

Flexible conduits vs rigid conduits do share some general similarities but also have some key differences. These differences are crucial to deciding what situation to use each one in. 

Installation Difficulty

Flexible conduit is the simplest and quickest to install of the two choices. It can easily be manoeuvred around obstacles without the need for special tools, unlike rigid conduit.  

Where flexible conduits can become more time-consuming is ensuring that they are secured to prevent any sagging or kinking. Compared to rigid conduit, flexible conduit doesn’t hold its own structure; instead, it needs to be secured with conduit clips or ‘G’ clips.

Environment Resistance

Overall, rigid cable conduits offer a higher level of environmental resistance than flexible conduits. They offer stronger shielding from physical damage, chemicals, moisture and other potential environmental hazards. This is why it is more common to see PVC conduits in permanent high-traffic areas.

Some flexible conduits are liquid-tight and made from stronger materials, but their USP is in their adaptability. Rigid conduits should be used where protection is a priority, and flexible conduits should be used where accessibility is a priority.

Support

Rigid conduit offers superior support, making it well-suited for long, straight runs and demanding environments where the cables being in a set location is essential. In contrast, flexible conduit is better for navigating complex routes, tight bends and areas with vibration or movement, providing greater adaptability and ease of modification in confined or irregular spaces.

Flexible conduits are good for protecting wires that are OK to be moved, but if you need a solid, supported solution, then rigid is the best choice.

Grounding

When working with electrical cabling, ensuring that the currents are grounded properly is important for the continued function of the device and to prevent any safety concerns. Each conduit can be used as a grounding path, depending on the material they are made from. The effectiveness of flexible conduits in grounding also depends on sufficient bonding at either end.

Rigid conduit is the best choice for grounding. It is the choice that is more commonly requested in regulation codes, thanks to its higher structural integrity and general stability.

Cost

When it comes to cost, there are two points to keep in mind. Flexible conduit on its own is usually more expensive than rigid conduits. But rigid conduits require more time to fit, which can increase labour costs, as well as the specialised tools to actually fit them and the connection fittings.

Flexible is easier to install and requires no specific tools, so it can be a more cost-effective approach overall. If either method works for your project, it may be cheaper to go with the flexible option, but making the investment with rigid conduits can be a safer choice.

Maintenance

Regardless of the external protection granted by electrical conduits, eventually the cables will wear out or need to be upgraded. If you want the option that will be the most protective and last the longest, it may pay off to have it be accessible enough to make any changes.  

Flexible is easier to maintain, as its adaptability means you can trace faults and make upgrades and repairs faster. It can be even easier if it is the split version, as this can be accessed at any point. But flexible conduits can also get kinked around corners if they are pulled too tightly and break.

Conclusion

Both flexible and rigid conduits offer effective solutions for cable management, each with distinct advantages depending on the specific application.

Rigid conduits are ideal for environments that require maximum protection and durability, especially where heavy-duty or external installations are needed.

On the other hand, flexible conduits are better suited for applications where ease of installation, adaptability and quick access to cables are priorities.

The best choice ultimately depends on the installation environment, cable type and maintenance needs.

Conduits With Lenson Select

If you’re still unsure whether flexible conduit vs rigid conduits are the right choice for your project, our expert team is here to help. Feel free to contact us with any enquiries, or if you are ready to place an order for conduits, trunking or any of our other fixings, you can reach us by calling 0121 553 6699 or emailing sales@lenson-select.co.uk.