top of page

Choosing the Right Size of Flexible Conduit for Your Electrical Wiring Project: A Guide by Tricksall


When it comes to electrical wire and cable installations, selecting the correct components is paramount to ensure the success and longevity of your project. Flexible conduit plays a crucial role in safeguarding and organising wires and cables, making it a vital choice for a wide range of wiring projects.

However, choosing the right size of flexible conduit is not a one-size-fits-all decision.

In this comprehensive guide, we will walk you through the steps to help you make an informed choice for your specific wiring project, ensuring safety, efficiency, and long-term reliability, but as always, if you need any advice get in contact with the Tricksall team.

Black Flexible Conduit Available in Sizes 7mm, 10mm, 12mm, 16mm, 20mm, 25mm, 32mm, 40mm, 50mm

Step 1: Determine the Wire Size and Quantity

The first step in selecting the right size of flexible conduit is to determine the size and quantity of the electrical wires or cables that will run through it. Measure the largest wire

or cable to ensure it can comfortably fit within the conduit.

Step 2: Anticipate Future Needs

Consider any potential future expansions or additions to your electrical wiring project. It's a good practice to select a conduit size that allows for additional wires if needed in the future. This proactive approach can save you from the hassle of redoing the entire installation.

Step 3: Calculate Conduit Fill

Conduit fill is the measure of how much space within the conduit is occupied by electrical wires or cables. Different types of wires and conduit materials have specific fill capacities. Calculate conduit fill to ensure it doesn't exceed the conduit's capacity, which could lead to overheating and safety hazards. Take a look at our Flexible Conduit Sizing Chart, also known as a Conduit Fill Chart.

Wires enclosed in grey, black and white flexible conduit

Step 4: Consider Bend Radius

If your wiring project involves bends, turns, or corners, be sure to select a conduit size that allows for an appropriate bend radius. This prevents damage to the wires and ensures efficient installation.

Flexible Metal Conduits

Step 5: Choose Conduit Material

The material of the flexible conduit is essential. PVC, polypropylene, stainless steel and other materials have different properties. Select the material that aligns with your project's environmental conditions and requirements, you can find all the information you need at

Flexible Plastic Conduit

Step 6: Seek Professional Guidance

If you are uncertain about conduit sizing, it's advisable to get in contact with one of our team, we can provide expert insights and ensure your project complies with safety standards and local regulations.

In conclusion, selecting the appropriate size of flexible conduit for your electrical wiring project is a critical step towards ensuring the safety, efficiency, and longevity of your installation. We've walked through the key considerations.

Remember, proper conduit sizing, meticulous installation, and attention to detail can make all the difference. Whether it's a residential renovation, a commercial project, or an industrial installation, the right conduit size ensures that your electrical system operates seamlessly and remains resilient over time.

At Tricksall, we're here to guide you through every aspect of your electrical projects. We hope this guide has been a valuable resource in your journey. If you have any more questions or need further assistance, feel free to reach out.

Tricksall, wish you success and safety in all your electrical endeavours!

17 views0 comments
bottom of page