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How To Install Ducting In the Correct Way.

Ducting coil is used to guarantee that pipes and cables are shielded against external forces, which may interfere with how the cables should operate. 

Ductwork indicates to an installer that there are significant subsurface drainage pipes or services present, suggesting that it will be left alone or simple to repair if necessary. So, it is crucial that the installation is completed to a high degree because it simplifies subsequent tasks and guarantees that whatever is travelling through the duct itself may function as intended.

Top Tip**

  • Ducting coil is identified by colour, so that it is easily recognsiable by the installer. This is a legal requirement in the UK and installers must ensure that the correct colour is used.
  • The optimum material used for ducting coil is HDPE.
  • Class 1 ducting is used for high voltage line.
  •  Class 2 ducting is used for low voltage.
  •  Class 3 ducting is used for general purpose.

The most crucial thing is to make sure ducting is done correctly. We are here to help and give you everything you need to know regarding ducting coil, including legal requirements surrounding the procedure, the installation process, as well as all the do & don’ts for ducting coils. 

What colour should you use?

Before you start any job, which included ducting it is extremely vital that you get the fundaments correct before you begin. The equipment needed for your project will be determined by the cables/ wires passing through and what they are used for. This is due to the fact that it is that it is legal requirement in the UK.

Ground workers can adopt the appropriate approach when there is construction going on around them since the colour of the pipes help them identify what is passing through the ducting.

Below highlights the correct colours used during ducting installation:

Orange – Used for street lighting/ traffic light signals.

Green – Used for the protection or any CCTV cables or fibre optic materials.

Blue – Used for water mains.

Black – Used to protect electricals.

Yellow – Used for gas.

Ducting Coils Colours Explained

How to decide which material is the right one for your project.

When deciding which material is best for you, we always advise speaking with a utility specialist. Nonetheless, there are a few broad guidelines you can adhere to that are generally accept.

The black electrical cable duct pipe x 6m is an excellent choice for short-distance duct installation because it is composed of high-density polyethylene. These six-meter lengths can be the best option for you because they are simpler to handle across short distances than the coils, which might make life more challenging because they are 25- or 50-meter coils. The most common length for cables is six metres.

The flexible coils (25m/50m) are useful for installations across extended distances. Flexible coils are frequently needed for installing electric cable to buildings. Moreover, they are available in Twinwall HDPE coils (high density polyethylene). This basically means that the ducting can handle abrupt changes in angles because of its improved flexibility while completing specific ducting installations in non-standard locations. The structure and strength of the ducting are improved by using polyethylene for both the smooth inner wall and the ridged outer wall, which maintains the ability of ordinary pipes to be dragged through by wires and pipes. Therefore, avoid the typical error of purchasing bends that are too rigid for the pipe and the terrain you are traversing will increase project duration.

When do you need to use extra strength ducting?

We recommend trying a stronger ducting pipe when the duct will be supporting a utility pipe in an area that needs to sustain significant loads. For instance, you would choose a higher resistance form of ducting if you had to run a specific type of MDPE pipe underneath a road. The enhanced strength types of ducting are only created to meet the required load rating; no specific material is employed in their construction.

When selecting the proper ducting to house your electrical wires, there is a little more to consider since it must be excellent enough to match the legal quality standards in existence. It is crucial that the ducting complies with BS EN 61386 and the 12–24 classes established by Energy Network Association Technical Specification if the electric cables are being run underground (ENATS).

The key information that you should be aware of prior to installing your electrical ducting is covered in both blog posts.  There are three main class types of ducting that you should be aware of, and this is one of the most crucial lessons that can be learned from both. Class 3 ducting is the most often used because it is made for everyday use, while class 1 ducting is used for high voltage cables and class 2 for low voltage purposes.

Don’t give in to the temptation to choose ducting if you are ever unclear about what is required. This will only produce negative outcomes. You can get in touch with us, and we’ll try to assist you. To lessen the chance of causing a hazard or breaking the law, we strongly advise that you consult a specialist.

Following the ducting guidelines.

  • If you’re going to build ducting, there are a few criteria that must be followed. Because it is legislation and is established in official regulations, as was already said, the first one is undoubtedly the correct colour.
  • Secondly, are the various depths which may be required for your project. For instance, we would advise avoiding the normal depth of 450mm and leaning more towards a depth in the range of 700mm–1200mm if you were constructing electrical ducting beneath a busy road.
  • Installation requirements for water ducts are a little easier to enforce. Due to the layer of insulation covering the water pipe, they do not need to be put at such depths. This is possible because the pipe is shielded from the elements by the foam.

To ensure you follow the guidelines correctly it is crucial that you seek the assistance needed if you are struggling to understand anything. Whenever, you are unsure or lack the ability to install specific types of ducting, you can use other government-written materials are available. As well as this we can ensure that you will be able to find other multiple online resources. By doing the correct research will ensure that you are completing the project correctly, as well as abiding by the rules and legalisations surrounding ducting.

Where will your ducting be positioned?

Know you fully understand the importance of ducting colour codes, you need to know where it will be going. The ground you are excavating almost always has old ducting with cables or pipes running through it, so you will need to examine it before you dig. Before you start installing anything, you can easily verify this by looking at the project blueprints and with an onsite expert. From here, you can securely determine where not to dig and make an informed decision about where your ducting will rest.

According to government standards, it is ideal to install the ducting so that it matches the layout of the existing roadways and paths. By reducing the number of black electrical ducting bends required as much as feasible, you can lower the project’s overall cost. It is advised that you offer a general notion of where you want your ducting to go by laying it out on the ground before making a final decision.

Laying lengthy radius bends for the straight duct and access chambers for the variations in angles is a wise measure to take to guarantee that you are aware of the parts you will undoubtedly need for your ducting installation. This creates an individual model that you can physically inspect and look at, enabling you to completely evaluate whether your plans are true. Make sure to account for the space needed for the necessary bends if you are installing your ducts using a flexible coil.

This is a fantastic approach to begin to visualise the project. So, it’s crucial that you utilise the appropriate ducting for the job. So, you would normally choose one of the flexible ducting pipe coils if you needed ducting with a little more give.

Our coils are the best option for underground use because they are light but durable and have an integrated draw cord. They also come in big coils to aid with lengthy distances. While utilising solid twin wall duct, keep in mind that it comes in six-meter lengths, is designed to be hard, and has less flexibility than the coils that are most frequently used. They are primarily utilised to decrease the amount of bends in a system and have less airflow resistance than flexible coils, which results in a higher capacity. Ducting is unique in that it is designed to be utilised in circumstances when a little bit extra sturdiness and dependability are needed. To ensure that the flow is not impeded in any way, the interior of the ducting is still smooth.

Before proceeding with the process, make sure you clearly understand the kind of ducting you require and how it will be applied. Don’t forget to mark off this area.

How to keep safe during your project

When beginning any project that calls for the use of resources like gas, electricity, or water, you must be certain that you are approaching it safely. Taking a closer look at this, you must turn off all utilities, including the supply to them, before you begin working. This is due to the possibility that, in the worst-case situation, you may cause fatal injury by working or encountering something that was live. Dealing with Ducting especially in the installation process should be done with vast caution. 

First things first, you must dig your trench. Don’t forget there will most likely already be ducting buried in the ground. Therefore, it is vital that you keep a close eye on specific things when undertaking your project.

One thing you should always be wary about when digging in areas where there may be old pipes, is that they may not have warning tape or indicators identifying the type of material it is constructed out of or what it was used for. We would advise to proceed with caution when faced with issues like this as the pipes will be old and the regulations that where in effect at the time of installation will now be out dated. We would also recommend you to be aware that the colour may not be the most accurate indication of what the pipe is or was used for because older pipes may also be discoloured because of the extended periods they have been buried for.

Again, if you are unsure of anything when digging a new trench and being face with older pipe work and discoloured ducting, we recommend that to seek advice from a professional.

However, on the other hand if everything goes smoothly and you stick to the path you had planned for your pipe, you should have a lovely trench for your ducting to fit into. To create a protective bend for the ducting to sit in, it is occasionally required to add a layer of grit sand at the bottom of the trench that is about 45 to 50 mm thick. It’s time to install the ducting after the trench has been established!

Getting started with the installation process…

The last thing you want to happen when installing the ducting is to lay the coil only to discover that it is damaged, so we advise performing a fast inspection of the coil before moving forward with the procedure. If everything checks out, you should be ready to start your project.

The next phase is simply to begin inserting your ducting into the trenches you have made. The last thing you want is to lay your lengths or coils of black Twinwall duct and then discover that you don’t have the proper twin wall or seals. So be sure you are using the right couplers and seals.

In addition, using a draw cord with your twin wall is crucial if you want to make threading cables through the ducting as simple as possible. To spare you the time and inconvenience of having to do it yourself, many of our coils already have the threaded cord inside of them. If this isn’t the case, though, make sure you have some anyhow to give yourself the peace of mind that everything will be ready when the wires need to be threaded through the ducting.

We advise getting a piece of fabric that fits the width of your pipe without hindering its ability to be pulled through, then attaching the draw cord. This will help you get the cord through the ducting. You can even use a hoover with tape to attach top the other end of the pipe,  and after using the using the hoover for a little while the draw cord should extend there. After that you would be required to hook your wires to the draw cord that has already been threaded through the ducting and use the other end to assist in pulling the cord through the ducting. You are one step closer to finishing the project now that cables are running through your ducting.

Finally, once everything is in place, all ducting installations should be double-checked. While running electrical products via the ducting, such as cables, the seals and points of connection are always the most important things to verify. This is since moisture will alter electrical components if it enters the system, which could turn into a safety problem. However, if everything is in order and you are satisfied with the ducting in general and the sealing points, it is now time to apply the tape and lay the backfill.

Backfilling in detail

When you backfill, you are reusing or replacing what has been dug up. Covering the actual ductwork with 150mm of sand is standard practise in the sector. Because the sand will act as a barrier, this can prevent the duct from being harmed by any piercing instruments. From here, you can add more soil, or another backfill of your choice to replace the remaining space.

You must first make a warning of what is underneath before you can finish off anything, and that is where the warning tape comes in. Because there are so many various types of ducting and tape, it is important to make certain that the type of warning tape you choose corresponds to the type of ducting you are using. Before backfilling the remaining space, the tape must run the complete length of the duct.

To view our range of warning tape here – ‘Click here’

Once you have marked your ducting correctly and completed the backfill your project is complete. If you have any further questions about any of our products, don’t hesitate to contact us!