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40mm HDPE Twin Wall Underground Ducting 10m - Black
40mm HDPE Twin Wall Underground Ducting 10m - Black
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40mm HDPE Twin Wall Underground Ducting 10m - Black

Rated 5/5 ⭐⭐⭐⭐⭐   1 reviews | 41 Questions
RBF logo RBF
  • Smooth inner
  • Chemical / water resistant
  • CEI EN 50086

HDPE underground ducting conduit in black with a tough, crush resistant corrugated outer and a smooth inner lining for easy cable installation (Read more)

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There are 7 variants of this product

Availability Discontinued
Product Code11874
ModelNR040-10
More Information

PRODUCT DETAILS

Our ultra-tough twin wall underground ducting has an HDPE crush resistant corrugated outer wall and a smooth inner wall for easy cable installation.  The high-density polyethylene is highly chemical and water resistant and has a compression resistance of higher than 450N.

The ducting is supplied on 50 metre coils or cut to length (40 and 50 mm only) in multiples of 5 metres.


Please note: Couplers are only supplied with 50m coils

twin_wall_ducting_diagram.png

The following sizes are available

Code Outer (mm) Inner (mm) Coil (m)
NR040 40 32 50
NR050 50 40 50
NR063 63 51 50
NR075 75 61 50
NR110 110 94 50
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SPECIFICATIONS
Specification
Material High density polyethylene (HDPE)
Colour Black
Use Low tension electrical and communication/data cable protection in buried underground systems
Max bend radius 8 times DN or OD
Quality mark NF-USE
Standards CEI EN 50086-1
CEI EN 50086-2-4 (Type N)
EN 61386-24
Compression resistance ≥450N with vertical deflection equivalent to 5% of the original diameter (200mm samples)
Impact resistance Type N at -5°C / 3kg/h (variable with size)
Temperature Range -10°C to +60°C
VARIANTS
18055 40mm x 1m (Per meter) - Black £3.60 In stock
11773 40mm x 50m - Black £74.26 In stock
18056 50mm x 1m (Per meter) - Black £4.50 In stock
11774 50mm x 50m - Black £86.66 In stock
11775 63mm x 50m - Black £94.38 Ordered on Request
11776 75mm x 50m - Black £103.82 Ordered on Request
11777 110mm x 50m - Black £163.02 Ordered on Request
USEFUL FILES AND LINKS
Videos
-- No videos available --
Files
  Twin Wall Ducting Datasheet
Links*
RBF website

* External websites provide additional content that supports the content on connectec.uk however the external Web site is subject to change and is beyond the control of Connectec Ltd. Connectec cannot guarantee the accuracy of content on external websites and does not endorse the information or products on any external websites. You will be subject to the external websites own privacy policy when you follow these links.

QUESTIONS AND ANSWERS

Get expert answers to questions specific to this product below or for more help visit our Q & A forum

Does the 63mm x 50m conduit have a pull string set up inside
( )
Yes, the full 50m reels have a draw string already installed and a draw string can be provided with the shorter cuts if requested
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Would this resist crushing by cars if it is laid or buried in a driveway and completely covered by gravel or stones?
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The Compression resistance of this ducting is ≥450N with vertical deflection equivalent to 5% of the original diameter.
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Can this be buried in concrete.
( )
It depends on the depth of the concrete. The compression resistance is ≥450N with vertical deflection equivalent to 5% of the original diameter (200mm samples). We would always recommend getting advice from a structural engineer before proceeding.
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Do you supply glands for the 50mm ducting, I need to terminate the ends into weatherproof plastic boxes ?
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We do not currently have any glands available for this type of ducting
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I am thinking of using this to run EV ready armoured cable, along the lower part of a fence (to avoid having to dig a long stretch/ under a driveway etc)…do you supply clips or ‘u’ brackets so I could attach securely to fence posts?
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Unfortunatley we do not currently have any options for clipping this ducting but you may be able to source some waste pipe wall fixings of a similar size for this purpose.
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Do the couplers give a watertight seal?
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The couplers do not give a completely watertight seal as they do not have any form of rubber gasket. They are simply designed to couple to sections of ducting together.
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I'd like to know whether this might be suitable to use in a pond filter set up, water pumped through at fairly low pressure, and whether it is solvent weld friendly?
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I wouldn't recommend it for that. As it's not a smooth outer it would be hard to make a waterproof joint between sections.
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I need to run a water supply and return pipe for underfloor heating (22mm pipes) over a run of 5m. Would the 50mm option be too small? Should I opt for 2 runs if it is smaller diameter?
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The internal diameter of the 50mm ducting is 40mm so it would be too tight. You could use 2 of the 40mm ducts instead.
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Hi there, are you able to supply samples of this? I only need a short length to see if it's suitable as I'm not planning on using it for conduit. a couple of inches would do fine.
( )
Yes, we can send out samples. Please email sales@connectec.uk to request a sample.
( )
Hi, what temp can this pipe stand?
I was thinking of adding a heater which pumps air at up to 40℃.
( )
The ducting is suitable for temperatures between -10°C and +60°C so it will be fine for your use case.
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Would this be suitable for running cabling from a solar PV and battery system under the floorboards - from the rear of a terraced house (where the panels are) to the front (where the distribution board is)? It’s approx 10m.
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Yes, this ducting would be suitable for most electrical or data cabling requirements.
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We are converting a barn and require service duct for water 100mm, Electric 125mm, Data/tele 50mm can you supply all relevant duct sizes.
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We currently only stock the duct sizes stated on the website and the maximum O/D is 110mm
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Is there any text on the outside of your ducting saying either "Electrical cable inside" or something similar? UKPN wants us to use ducting that carries such a label (in addition to the usual yellow tape higher up).
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Our black ducting does not have any warnings on the outside for high voltage.
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Would 40 or 50mm ducting be suitable for laying BT telephone line or a fibre optic cable underground?
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Yes, this ducting is suitable for all types of copper and Fibre data cables
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Is this OK to use on a training wall to add pebbles on top to help with drainage? Thanks
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We can not advise on the effectiveness of this for this purpose as it's recommended use is for the containment of cables.
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Do you stock the end caps for that ducting to prevent water getting in?
( )
Hi there,

We do not currently stock end caps for ducting, however this is something we will look into supplying in the future.
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What is the external dimension of the conduit please if the ID is 40mm?
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The ducting sizes listed on our website state the overall diameter not inner. The inner diameter is typically 8-10mm less than the outer e.g the 50mm ducting has an inner diameter of 40mm
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Does the 50mm ducting includes a drawcord to pull through cables easily?
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The draw cord comes with a full reel of this ducting and when smaller quantities are ordered you can specify to leave the draw cord in
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Do you do shallow bends to terminate your 100mm duct into a plinth
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Unfortunately we do not currently stock any bends for our underground ducting
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Can the couplers (50mm ones) be sold separately?
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Please contact our sales team on 01978 806111 and we should be able to assist with this.
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Can I run mains 25mm water pipe through it.
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Yes, there is no reason why you can not run a water pipe through this ducting. I would recommend the 50mm as this has a 40mm inner diameter allowing for more room if you require slight bends
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Can this conduit be terminated at a junction box (such as a WISKA box) with a secure and water resistant method? Is there a specific gland I can buy to do this?
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We are not currently aware of any IP rated glands for terminating this underground ducting. It would typically be pushed into the underground inspection pit boxes that we sell.
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I need a duct for a fibre cable is your 50mm HDPE Twin Wall Underground Ducting adequate and if so what's the max length, I need 30m. Can pick up as live in Whitchurch Shropshire.

Gary Chesters 07817 148692
( )
Good morning,

Providing the thickness of the cable is suitable for the internal diameter of this ducting, this will be suitable. We can supply this ducting in continuous lengths of up to 50m, so 30m will be no problem.

Kind regards
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What size of duct would I need for 6mm armoured cable ?
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The typical overall diameter of 6mm armoured mains cable would be around 16-17mm. I would recommend that you either use 40mm or 50mm twin wall ducting. If the duct will be installed around corners I would recommend going for the larger size.
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What is the minimum bend radius of both the 50 and 63 mm ducting?
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The minimum bend radius is 8 times DN or OD
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I would like 20m of 14942 NRO 75mm underground ducting in one piece , is this possible? How do I specify this when ordering than you Tim Rees.
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Hi Tim,

This can be done by selecting 2 lengths of 10m and requesting that this is cut as 1x 20m length in the comments section during checkout.

Kind regards
( )
Are you able to supply a 15 metre single length of your 50 mm conduit.
Regards Wilson
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Yes we automatically ship as one length. If you order a 10m and a 5m length, this will be shipped as one 15m length
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Is this perforated and would it be able to carry non pressurised water from a gutter
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The ducting isn't perforated and should be watertight. It is corrugated on the outside and smooth on the inside. It is designed as a conduit for cables but I can't see why it wouldn't work for this purpose.
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Hi, is this good enough for underground swa cable to EV charging unit
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Yes this is suitable for electrical or data cables underground
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Hi. Is it cuttable so I could make it split along it's length?
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Hi Sean,

All of our ducting is cuttable so making the incisions that you require will be no problem.

Kind regards
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What size ducting would I need to put a single telephone cable in and could I put a run of i
100m without a chamber . Many Thanks Rob
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I would recommend the 40mm twin wall ducting for this.
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Is the twin wall flexible. Do you sell 50mm to 50mm adaptors?
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Hi Gil,

This ducting is reasonably flexible and on the larger rolls (50M) will come with the couplings.

Kind regards
( )
Hi do you do 110mm flexi ducting rolls in Red ? I need 13 rolls (650)
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Hi Sean,

Unfortunately we have now discontinued our red ducting, and the last rolls we did have are now sold out.

Kind regards
( )
Hello I’m about have a patio
With a shed at far end
My spark can’t do the armour cable B4 he on holiday
so would this be ok to put under patio to run 6mm armour through
( )
Yes this should be suitable but ensure that there is some mains warning tape above the ducting if possible.
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@Paul Jarvis. You mention buying inspection pits to join the ducting but do you have a recommend product that would work for the 50mm ducting?

Thank you in anticipation
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We have a small range of inspection pits in stock. please call our sales team on 01978 806111
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Can I get 15m in one piece by ordering 3x5m?
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Yes. If you order the quantity you require either 2x10m and 1x 5m or 3x5m, them put a comment in the comments box at the checkout to state you would like this as one length.
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The 40mm would it bend say 90 degrees ?
Maybe with some heat applied?
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The ducting would almost certainly kink severely at that angle making it very difficult to pass cables through so I wouldn't recommend it
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Is this product flexible despite its twin walled strength.
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The twin wall is very tough and is designed to be crush resistant. As a result, the flexibility is limited. You can bend and manipulate the ducting and the smaller diameter has a better bend radius than the larger diameter.
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Do I need couplings to join the ducting , I need to connect to a number of points to supply auto gates
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We would recommend using inspection pits to join your ducting as this makes pulling cable through much easier. An inline coupler is supplied with a full 50m roll of our twin wall ducting.
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Can i use this as an underground sewer pipe?
I already have a 150mm ID pipe traversing under a trunk road. I need to get an SWA cable under the road using the sewer pipe and was thinking of buying this 110mm flexible pipe allowing enough room for the 15mm SWA cable to fit inbetween.
Could this pipe be used as a sewer pipe, given that it is chemical and water resistant?
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As this cable ducting is designed to be buried in the ground, we do not see why this could not be used within another pipe. We cannot guarantee that it's chemical resistance will be sufficient as it is not normal practice to install this submerged within a sewer.
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Does this come with draw string already in?
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Our twin wall ducting is supplied with a draw string when a full 50m roll is purchased. Shorter cut lengths are not supplied with a draw string.
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REVIEWS
Thanks for taking the time to review this product.
Your feedback helps us improve our products and services as well as helping other users make informed buying decisions.
Very good product
⭐ ⭐ ⭐ ⭐ ⭐
This is very good quality ducting and Connectec was the only place I could buy a short length for a reasonable price.
Reviewed by: Tony - 17/09/2021   
2 of 3 people found this review helpful    Verified purchase

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